Poll - How fast does your 125cc go? (Vader / Razkull / etc)
 

So I'm curious, how fast are people pushing their 125cc motorcycle?

I have the Boom Vader with a Mikuni VM26 carb and cone filter and 125 jet.

I haven't pushed it past 43mph with it hovering around 6K RPM but I am noticing that the whole bike buzzes and vibrates so much, I'm wondering if it will fly apart into a hundred pieces. Is 6K RPM about right for cruising speed in 4th gear?

So when you reply, tell us the following:

Make / Model
carb upgrade?
airbox or cone filter
jet uprade?
Top speed
Max RPM
Does your bike feel like it will tear apart at the top speed?
what's your cruising speed and RPM?

Really interested to hear others' experience.

thanks

I don't have the bikes you're listing but I do have a Honda horizontal engine 125cc clone bike. It has a fully automatic transmission. It easily will do 45mph but gets loud and buzzy as you say. I think if it had a standard transmission with the right gearing it would go faster and be much smoother. I believe I am running the PZ19 carb with cone filter and I drilled out the exhaust to open it up some. Drilling out the exhaust made the biggest improvement in power/speed.




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thanks for chiming in, that is good to know. Do you know what RPM you're at when doing 45pmh? What do you think your max is?

Check out (miami scooter club) on youtube. He really pushes his Vader. He has a stock carb, 90jet, air box mod, 17t sprocket and I think an AR exhaust. He commented his bike got to 63, although I'm sure he's gotten it faster since.

I have the Vader 125..
I have stock carb, pod filter and jets coming in the mail today. I took off the exhaust heat shield, drilled out the exhaust and installed a 16t front sprocket. I've pushed my bike to 7000 hit a max of 56 mph. Plan on ordering a piranha oil cooler kit off amazon later this week. I hope it works.

Make sure you check your front fender, when I got the bike I know I tightened it. Vibrated loose and had to re-tighten it. Mine vibrated so much it was uncomfortable to ride. Riding often or whenever I get the chance, the vibrations have gotten better. Also, my break light is just kind of floating...probably cause for a lot of the vibrating going on.

https://www.amazon.com/Piranha-Compl...oil+cooler+kit

Before you guys start throwing numbers around, test your speedo for accuracy. I did speed runs on my bike using 3 different GPS based speedo apps on my cell phone and my bike's speedometer is about 5mph optimistic. The speedo would read 59mph and I was really doing 54mph.

Point taken. I'm not looking for anything scientific. Wondering what is the real "red line" on these things and how close I am to it. At 6KRPM and I'm only doing about 45MPH, is it safe to go to 8KRPM to get to a decent cruising speed without killing the motor?

This is true. I've had to use a speedo app for my bike before I got a new sensor hub.. 1000 bikes 1000 variations

Completely stock vader about 48ish

When I took my bike on it's first ride I hit 60mph in a full tuck going down a small hill. A bone stock ankle nipper doing 60mph:lmao: I knew I had to get out the cell phone and do a reality check. I've gotten the bike up to 56mph in a full tuck, on a level straight. The bike was doing 8200rpms with the 15t sprocket. I put a 108 link chain on it yesterday and installed a 16t sprocket. I was able to get up to 56mph@7100rpms on the way home from work today. I've gotta 17t sprocket on order, which will get me up to cruising speed at an even lower rpm, but I'm thinking 16t may be the best compromise between top end speed and off the line acceleration. With the 15t sprocket 1st gear was useless, I would start off in 2nd and give it a little more throttle before letting out the clutch. I can use 1st gear with the 16t sprocket, but under 30mph the acceleration is :zzz:

That's interesting! I'm going to install the 16T sprocket. I agree, 1st gear right now is so useless on the 15T sprocket. I am willing to give up a little low end acceleration to have a lower RPMs at the high end cruising speed.

My bike is really starting to ride great and every time I take it out, it seems to get smoother. Today I was up to 50mph at around 7000RPM.

Do any of yous guys have registration marks on your chain adjusters? Mine doesn't have them and I couldn't find my alignment tool. I had to use a machinist's rule to get the new chain in the ballpark until the new alignment tool arrived this morning.

http://i32.photobucket.com/albums/d4...psufd0e7bz.jpg

i had a 110cc horizontal pocket bike that i hit 57 mph with... but that took some work...LOL stage 2 cam, vm26 carb, ported head, and a wide open exhaust.... was a wicked bike though...LOL
http://www.youtube.com/watch?v=X0TU9qiSyII

Nope, no markings whatsoever. Before I change my sprockets, I'm going to put in some markings on both sides.

I've just kinda eyeballed it... not the best idea but I have only hit 50 miles as of today. Still waiting on my MCO. Wondering if scratching or putting light markings in with a grinder is a bad idea or not.

hehe. yeah, the grinder might be overkill. I was thinking of a file or flathead screwdriver. lol.

just for a block...
 

Ok, so far mods are 26mm Mikuni, Aodonly exhaust, and 16t sprocket I installed about 45 mins ago. I live in town, so took it up the block a few times, then decided to ham on it a bit. Only 7 miles on it...oops...lol. But in the course of my block, got it up to 50MPH on factory speedo, still 3rd gear, approx 8k RPM. Feels really strong since dropping main jet from 115 jet. Running a 105. It no longer flutters, just runs real strong all the way up to 7.5-8k. Very happy. 16t sprocket...all I can say is WOW, what a difference. I'll have to see how she goes with one more gear left.

I didnt run it to redline, I figured close to 8k was enough with only 7 miles on it...but pulls strong until I shift, real strong for a little 125.

I wouldn't bother cutting registration marks into the swingarm. Your better off getting an alignment tool from ebay or amazon for around $10. Chain tensioners will have some play, especially the bolt&block type that are on my Aprilia. Motorcyclist had a tech article on wheel alignment a coupla years ago. They stated that riding a bike a mile with a 1 degree deviation was equal to dragging the rear tire sideways 100ft. Anywho, I put a 17t sprocket on the bike yesterday and rode it to work. I was able to briefly do a GPS verified 59mph@8200rpms on a level straight in a full tuck. After shifting into 4th gear it took almost a mile to reach top speed. Acceleration below 6000rpms is weak, but shifting at around 8800rpms I can keep up with traffic. I just wish the clutch had a shorter throw.

@Skin--you are one of the only members with a mini that is NOT a Vader. How did you buy yours? Mail order or a physical dealer? Did you have issues like the Vader guys? Your 59 mph sounds promising; is the 17 tooth your only modification?

So I installed the 16T sprocket and it makes a HUGE difference. I highly recommend it. Not sure I would go to 17T. I have not maxed out the RPMs yet so I don't know what the max speed is.

BTW, I think installing the new sprocket will NOT affect your speedometer because our speed sensor is in the front wheel. If it was in the transmission, then I can see that, but our speedometer should still work fine.

I bought this rear wheel lift from Harbor Freight for $26 (after 20% off) and it's great.

https://www.harborfreight.com/motorc...and-65620.html

http://i75.photobucket.com/albums/i2...506_181532.jpg

I have to admit, putting the chain back on and making sure it had enough slack and that both sides were equal distance was challenging.

I measured the distance from the center of the bolt to the end of the swingarm on both sides to make sure they matched. I also measured the center bolt of the wheel shaft to the center bolt that is near sprocket.

I went ahead and ordered a chain alignment tool just in case. for less than $10 on amazon, you can't go wrong.

https://www.amazon.com/ABN-Alignment...alignment+tool

One mishap that I encountered was when I was putting the cover back over the sprocket, I somehow stripped the threads that held the top bolt so now my cover is only being held on by one bolt. I don't think it will go anywhere.

Here are some youtube videos for reference:

https://www.youtube.com/watch?v=H46Z...bKtDanOFP7niHe

https://www.youtube.com/watch?v=zB4D...7niHe&index=25

https://www.youtube.com/watch?v=hH2D...bKtDanOFP7niHe

I had to realign my chain after installing the new sprocket, having the proper tools makes life a helluva lot easier. Good call on the HF paddock stand. I bought a wheel chock from the local HF store a coupla years ago and gave it to one of my peeps. He put it in his trailer just in case one of us has a breakdown. He's unstranded my Aprilia twice since then. Harbor Freight has some good equipment, but I wouldn't by a hydraulic lift from them.


I ordered mine after seeing an advert on Craigslist. There are several websites that list the Icebear Little Monster(PMZ125-2). I clicked on the Venom Motorsports ad at the top of the forum homepage and they have a version of my bike for $1349.99 with free shipping and no sales tax for US customers. I paid $1699 for mine :ohno:

https://www.venommotorsportscanada.c...torcycle-125cc

Anywho, My list of upgrades so far; racing CDI and coil, 26mm Mikuni carb, oil cooler, gutted and shortened muffler with exhaust wrap, inverted shift lever, and the 17t sprocket. The only way to go faster is to do a big bore kit, or drop in a Pitsterpro 150cc HO crate motor ;) I'm gonna try to improve the aerodynamics a bit and make a bikini fairing that I can get behind in a full tuck, and try to lose an extra 10lb off my gut. I've lost 20lbs for this bike, but I'm a compulsive snacker.

Dang there skin lol. I really thought I wanted one of those ( I kinda still do ) but I sometimes wish my lil ole 250 Dual Sport had more grunt, so I'm pretty sure Id get agitated at the 125 sooner than later.

I had thought they were selling the Ice Bear product, but the fact that they are NOT selling the Ice Bear Fuerza had me thinking; then I saw both of the Ice Bear bikes and the Vader bikes on Kronik Racing's site, and Kronik advertises them as 'Boom'. I have a feeling that the Venom bike is another Boom bike not shown on the Boom/Baodiao site that looks like the Ice Bear Little Monster. If my theory is correct, you shouldn't regret getting an actual Ice Bear product. I wonder if Venom would be straight on who makes their X21 if someone called?

http://www.kronikracing.com/Lil-Monster_p_394.html
http://www.kronikracing.com/Fuerza-125_p_395.html
http://www.kronikracing.com/Baodiao-...on-_p_401.html (not sure if there is really a 'California edition' or is this just one a Californian can register?)
http://www.kronikracing.com/Baodiao-Lil-Duc_p_398.html (the one they call 'Lil Duck' that does its best to imitate a Little Monster)

Hey Skin,
can you give us details on your racing CDI and coil? What benefit does that provide in performance?

Really loving how it rides with the 16T sprocket!

I don't regret buying it, but the quality doesn't appear to be any better than the others. I put the replacement tail light on last week, I've ridden it twice since then and the LEDs are starting to burn out. I'm going to ride it about 60 miles tomorrow morning, but not without reinstalling the tail light I bought from amazon. The instrument panel is also giving me some issues, but it's to be expected. Buying a new Chinese bike is like buying an old British bike. I'm expecting to find the Lucas logo on the wiring harness :lol:

The coil provides higher voltage to the spark plug and the CDI eliminates the rev limiter. The stock CDI on my bike had a 6500rpm limit. With the racing CDI I can wind the engine up to 9000rpms, or until it flies apart. Of course now that I put the 17t sprocket on it, I won't need to go beyond 8000rpms when I'm riding the back roads, which was my main reason for buying the bike.

Is this the setup that you put on your bike?

http://www.ebay.com/itm/252733203584

do you think it can be contributing to your electrical system issues?

I saw this very comprehensive video regarding this upgrade and the guy got minimal improvements. Granted he worked on a 49cc moped, but still, it should be a much better improvement if you're going to go through the trouble.

https://www.youtube.com/watch?v=p63JXW29tVo

Video on how to remove the resistor in the spark plug
 

Has anybody ever tried this to see if it improves performance?

I guess it's like going from a A7RTC to an A7TC spark plug?

https://www.youtube.com/watch?v=5FOtJUbjpoo

this next video does a good job of showing the type of spark you get from a non-resistor spark plug compared to one with a resistor

https://www.youtube.com/watch?v=8r0orqrlOf8

prismways, I don't think the ignition upgrade is causing the electrical problem. It's probably a bad ground. The CDI and coil look like the ones in the ebay link, except my CDI has a 5-pin connector, and it was about $18. I haven't tried the non-resistor plug mod yet. I don't see why the guy in the video would waste time on an aftermarket ignition for a scooter with a CVT. If he wants to improve acceleration or top end speed he needs to swap out his pulley weights. Regarding the stripped bolt hole, you can shim the bolt by wrapping the threads with electrical tape. It's not a fix I would use on a motor mount bolt, but it'll do fine for a sprocket cover.

MOTOXtreme, What the ankle nipper lacks in performance it more than makes up for with the fun factor. If it had been on the market 2 years ago, I wouldn't have bought the Aprilia.

Did you notice an improvement after upgrading your coil and CDI?

thanks for the tip on the stripped bolt hole, I'll give it a shot.

Not bad...
 

Took my vader out yesterday for a top speed run. Have Aodonly exhaust, 16t sprocket, mikuni 26mm carb, 110 jet. By a tree line with no wind, 61MPH. Into the wind, like 10MPH breeze, 55MPH. With the wind, 64MPH. Factory speedo tho. Buddies z125 PRO speedo was same as mine at 50MPH. We raced, his is all stock, I steadily pull away from him through the gears. Not like blow his doors off, but by time I hit 4th gear, I got 2-3 bikes on him. Had fun!!

My unscientific butt dyno registered an improvement in acceleration over the original set up, mainly because of the extended rpm range. With the stock CDI the bike wouldn't even reach the 7000rpm redline.

Nice! to be honest, I'm hesitant to drive at 60+ on the bike. It vibrates so much and buzzes everywhere and the handling feels unstable, it makes me want to slow things down before it flies apart.

If it had a fifth gear, I think that would help the most. I know some of the other bikes do have a fifth gear.

Dood, you need to check your motor mounts ASAP! Before my bolt broke, the monster ran smoother at 6800+ than either of my other bikes. It had virtually no vibration at 9000rpms.

On my Vader I have the 26mm mikuni (Chinese copy) carb with a pod filter and a 105 or 110 (I cant remember) main jet. Needle clip moved down 1 slot. I haven't maxed it out but it cruses at 45mph in 4th gear around 6000RPM. I also have a 16 tooth front sprocket. Fastest spped i hit was 55mph. It was still accelerating but didnt push it past that. Also the 55mph speed was what the gauge cluser said. GPS said 53mph so i'm surprised how close the speedo actually is.

Another thing to remember, if the speedometer is off, so is the odometer. Today I rode the monster an indicated 116 miles, my actual GPS verified mileage was 103. I gassed up at 95.2 miles, taking 1.39 gal to fill the tank back up, which gives me 68.48mpg. Not bad gas mileage considering the bike had a 155 main jet and a major exhaust leak. I just replaced the damaged exhaust gasket and down jetted to a 120. I'll ride the same route tomorrow and compare my fuel economy.

Man, you put some serious miles on your cycle. I'm lucky if I can get 200 in one year. Granted, it's only limited use for me as I take a train to work.

I've had the bike on the road for about a month and I've put 731 actual miles on it. If the bike would do 65mph, I'd go for even longer rides. I road the same route today and gassed up at 96.3 miles, adding the 8.2 miles after gassing up yesterday puts the bike at 104.5 miles between fill ups. I put 1.36 gal in the tank today, giving me 76.8mpg. The route was a mix of urban sprawl and rural roads, and my riding style is beyond aggressive.

I have to see what my mpg is after all the modifications.

You have a tank capacity of 2.64 gallons on the little Monster.
The Vader's tank capacity is 1.58 gallons. Really sucks.

I have hit 57mph with a 17t front sprocket while drafting a semi lol. But, my tune was very rich. I should go 60+ once I get the fueling correct.

It's about 1/8 short of being 3 gallons. The gas tank was my main reason for picking the monster over the Vader. I knew I would be racking up a lotta miles and I didn't wanna plan my rides around fuel stops, like I do with the Aprilia >:

Yeah, I can totally see that. And the semi-Ducati style doesn't hurt either. it's a sharp bike.