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Old 08-20-2023, 05:48 PM   #1
XLsior   XLsior is offline
 
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Don't really need to be an expert to metal fab a mild steel exhaust pipe. My exhaust pipe has basically been my welding "apprenticeship" sure it might have a few internal baffles and pin hole leaks, but with a flap disc, high temp paint and exhaust wrap any weld jank can be throw rugged over...

Structural frames and fluid/pressure vessels is where a professional might be a better and safer expense.


 
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Old 08-22-2023, 01:26 AM   #2
bigdano711   bigdano711 is offline
 
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Look what I found 45 miles from my front door. 90+ miles round trip, I'm a hurtin' unit and loving every minute of it!!


Middle Piney Lake via X-PRO Hawk 250, a few miles up from the Sacagawea Camp Ground. Can you tell you've just entered a forest? Bridger-Teton National, to be exact.







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2023 Hawk 250 from XPRO off of Amazon
MOUNTAIN MAN RC + MOTO on YouTube

"If there were more bloody noses, there would be less wars." - Hagbard Celine

"Someday, after mastering the waves, the winds, the tides and gravity, we shall harness for God the energies of love and then, for the second time in the history of the world, man will have discovered fire." - Pierre Teilhard de Chardin


 
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Old 08-22-2023, 04:51 AM   #3
Thumper   Thumper is offline
 
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Now that's awesome. Personally, that's why I got a street legal dirt bike. Get there, and explore!!!

We are in a heat wave, and that water looks nice and cool. I'd be swimming in it!

There is an excellent hiking trail #2062(middle piney). Can't take the bike up there, but the views look great!
https://www.alltrails.com/trail/us/w...piney-trail--2
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Old 08-22-2023, 09:00 AM   #4
Bill Hilly   Bill Hilly is online now
 
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If your unit is hurting, try different pants . LOL
Seriously though, I have noticed that some pants are far more comfortable than others on these bikes, especially when riding in bumpy, hilly conditions.


 
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Old 09-06-2023, 01:05 PM   #5
bigdano711   bigdano711 is offline
 
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Took the Hawk for a little evening fishing.












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__________________
2023 Hawk 250 from XPRO off of Amazon
MOUNTAIN MAN RC + MOTO on YouTube

"If there were more bloody noses, there would be less wars." - Hagbard Celine

"Someday, after mastering the waves, the winds, the tides and gravity, we shall harness for God the energies of love and then, for the second time in the history of the world, man will have discovered fire." - Pierre Teilhard de Chardin


 
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Old 09-08-2023, 04:37 PM   #6
Zapkin   Zapkin is offline
 
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great pics. bike looks great. I too am thinking about an aftermarket exhaust. the difference that the Nibbi carb and cold air intake made is pretty substantial, especially when merging or climbing hills. makes me want to take it to the next level (i know..i know..considering my past posts..i know hehehe). have fun bro!
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Old 09-08-2023, 08:45 PM   #7
buzz   buzz is offline
 
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Hey my after market exhaust fit fine,needed nothing to install.Amazon 70 dollars.Get a new copper exhaust gasket,pipe dose not come with one.


 
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Old 09-09-2023, 12:03 PM   #8
bigdano711   bigdano711 is offline
 
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You got a link to that thing, buzz?
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2023 Hawk 250 from XPRO off of Amazon
MOUNTAIN MAN RC + MOTO on YouTube

"If there were more bloody noses, there would be less wars." - Hagbard Celine

"Someday, after mastering the waves, the winds, the tides and gravity, we shall harness for God the energies of love and then, for the second time in the history of the world, man will have discovered fire." - Pierre Teilhard de Chardin


 
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Old 09-13-2023, 03:03 PM   #9
bigdano711   bigdano711 is offline
 
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What do you guys think of the Stoneman exhaust? The reviews seem pretty good:


https://www.amazon.com/gp/product/B0...TE7K35KG&psc=1


Well, I got the 16t front sprocket installed and I gotta say, I believe I found the sweet spot for stock carb, Nibbi air filter and stock exhaust with silencer removed from rear type power.


Stock: f15t/r50t = .300
Common: f17t/r45t = .377
Mine: f16t/r47t = .340


That sprocket combination with my fat ass ~ 250lbs and mostly stock carbed power seems to be the sweet spot. The 17/50 is basically identical to the 16/47, unfortunately I cut my new chain too short to fit the 50t stock rear sprocket. After putting the JT 47t on, I'm glad I did because it's just a better quality sprocket and took up the bit of space between the snap ring and removed the resulting wobble.


So, I was actually running 17/47 for a while and found that 5th gear was useless unless there was zero wind or I was going downhill. That was not going to work for me and I decided to try the 16t sprocket. Now she pulls a little while going into the wind, uphill and will not lose rpm/speed but will drop from ~60 to 55mph and hold.


55mph = 6600rpm
60mph = 7000rpm


I still need to take my carb off and adjust it, possibly re-jet a little fatter. I might get a slight power gain when I finally do that.
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2023 Hawk 250 from XPRO off of Amazon
MOUNTAIN MAN RC + MOTO on YouTube

"If there were more bloody noses, there would be less wars." - Hagbard Celine

"Someday, after mastering the waves, the winds, the tides and gravity, we shall harness for God the energies of love and then, for the second time in the history of the world, man will have discovered fire." - Pierre Teilhard de Chardin


 
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Old 09-13-2023, 05:20 PM   #10
XLsior   XLsior is offline
 
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@ 200pounds/90kg I found 17/45 was pretty close on the CG250 with an 18" rear wheel for backroad/mainroad use... Most gears had a reason to exists rather than just trying to skip to get into 5th for everything.

Trying 16/44 for more hill climb and stop start acceleration...also a little less reciprocating mass...'negligible' which has made improvements in those areas.

However as I'm dialing in the big bore kit I think 17/44 will end up being my personal optimal gear ratio. As I am finding some hill inclines while still capable in 5th could be better tackled in 4th or 3rd. I find 2nd and 3rd gear seem hardly used...

which leaves 5th gear as the primary 'overdrive' duty so trying that get cruising speed at any reduction in engine RPM is beneficial.

However I am yet to test 17/44 in a headwind attempting 65mph/100kph.

For off-road single track I could just chuck in a smaller front to improve tractor factor....

in the end the perfect gear ratio setup is up to the riders needs and environment...


 
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Old 09-13-2023, 06:05 PM   #11
bigdano711   bigdano711 is offline
 
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My goal was to be able to cruise at 55mph and get up to 60mph if necessary. Any faster than 60 on these nobby tires is just too sketchy for me. I get a lot of wind where I'm at and there be hills. I found with 17/47, I could wind 4th all the way out to almost 55 but the moment I switched to 5th I would lose all momentum and 5th had no pull at all and I would gradually lose speed and rpm. Even on flat land with no wind it struggled to achieve 60mph. I don't want to be shifting between 4th and 5th at around 50mph while a car doing 75mph approaches from the rear.
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2023 Hawk 250 from XPRO off of Amazon
MOUNTAIN MAN RC + MOTO on YouTube

"If there were more bloody noses, there would be less wars." - Hagbard Celine

"Someday, after mastering the waves, the winds, the tides and gravity, we shall harness for God the energies of love and then, for the second time in the history of the world, man will have discovered fire." - Pierre Teilhard de Chardin


 
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Old 09-13-2023, 06:19 PM   #12
XLsior   XLsior is offline
 
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I'd have to agree...the engine likes to make peak torque in the lower rev range. So a taller 5th gear tends to lose its push factor at higher rpm.

the big bore kit has just enough added poke I find to make the 2.6* ratios more accessible with less penalties/drop offs.

Im not sure how you worked out your ratios as all the sprocket ratio charts online put a 16/44 and 17/47 at about the same 2.75 gear ratio


 
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Old 09-13-2023, 10:12 PM   #13
bigdano711   bigdano711 is offline
 
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Quote:
Originally Posted by XLsior View Post
Im not sure how you worked out your ratios as all the sprocket ratio charts online put a 16/44 and 17/47 at about the same 2.75 gear ratio

They are just straight ratio between sprockets, no transmission taken into account.


Where do I get a skid plate?
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2023 Hawk 250 from XPRO off of Amazon
MOUNTAIN MAN RC + MOTO on YouTube

"If there were more bloody noses, there would be less wars." - Hagbard Celine

"Someday, after mastering the waves, the winds, the tides and gravity, we shall harness for God the energies of love and then, for the second time in the history of the world, man will have discovered fire." - Pierre Teilhard de Chardin


 
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Old 09-14-2023, 03:04 AM   #14
Thumper   Thumper is offline
 
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Quote:
Originally Posted by XLsior View Post
Im not sure how you worked out your ratios as all the sprocket ratio charts online put a 16/44 and 17/47 at about the same 2.75 gear ratio
Yup, it's a concept taken directly from automotive terminology called the final drive ratio. When choosing sprocket(s), you can calculate an accurate percentage change from OEM final drive ratio which translates accurately to change in speed at any RPM (in any gear). Change in percent is a really useful way to select your new sprocket(s) if you want to drop RPM at 60 mph, for instance.

I used it to drop speed at same RPM when I selected sprockets for better off road performance and a bit more torque in tight situations on trails. Yes, I wanted to gear down, not up !
Of course, it works both ways.
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-NOS 2020 KTM 250SX (2-stroke motocross), less than 10 hours on it



Last edited by Thumper; 09-14-2023 at 07:23 AM.
 
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Old 09-13-2023, 08:31 PM   #15
buzz   buzz is offline
 
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Sorry no link on exhaust,Wheres you skid plate? You need one, one small rock could break you engine case.


 
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