No Power 5th Gear - Page 2

kyriakos · 04-24-2018, 07:43 PM

Quote:

Originally Posted by Cravin01

Its definitely not rapping all the way out, Does the throttle lose all pick up in the last 1/4 turn or is it wide open?

If its wide open then you might need to re-adjust your throttle cable because you never got high in RPM's in any gear.

If its falling on its face at the top of the throttle then you need to look further into your jetting etc..

That bike should sing wide open but its not getting there.

Doesn't seem throttle does much past 25% of throttle, in really any gear. Similar behavior with needle shimmed and not shimmed. I tossed in the stock spark plug and removed gas cap for a run to ensure it isn't fuel ventilation, same behavior. Seems the 115 to 110 didn't really have much impact either. Maybe my stock carb is just busted... Mikuni VM26 looks like it's backordered by a month or so...

**JerryHawk250** · 04-24-2018, 07:51 PM

Did you visually check to see if the slide is fully open in the WOT position? Is there excess slack in the throttle cable?

jimwildman · 04-24-2018, 07:52 PM

Quote:

Originally Posted by kyriakos

Doesn't seem throttle does much past 25% of throttle, in really any gear. Similar behavior with needle shimmed and not shimmed. I tossed in the stock spark plug and removed gas cap for a run to ensure it isn't fuel ventilation, same behavior. Seems the 115 to 110 didn't really have much impact either. Maybe my stock carb is just busted... Mikuni VM26 looks like it's backordered by a month or so...

I remember clearing a bunch of casting clay out of the idle jet on the stock carb when I first got my hawk. the bowl had a bit in the corners as well. I had a time scraping it all out, I used a single bristle from wire brush to clear the jet. ran fine afterward.. worth looking into.

kyriakos · 04-24-2018, 07:57 PM

Quote:

Originally Posted by JerryHawk250

Did you visually check to see if the slide is fully open in the WOT position? Is there excess slack in the throttle cable?

I could blow through the jets. Throttle plunger opens and closes completely with no slack. Puzzles the crap out of me... On stock sprockets I couldn't get beyond 45, downhill... And I only weigh 160

**JerryHawk250** · 04-24-2018, 08:01 PM

I would do a compression test just to rule out if there's any issues with rings or leaking valves.

kyriakos · 04-24-2018, 09:19 PM

Quote:

Originally Posted by JerryHawk250

I would do a compression test just to rule out if there's any issues with rings or leaking valves.

Compression is @150. Not sure what's normal for these motors?

Cravin01 · 04-24-2018, 09:20 PM

Im think that if it drops the ball after 1/4 throttle in any gear with different jets that possibly your pulling in air through a screwed gasket.

It may only happen after the engine develops more force (at a quarter turn) before it pulls in more air, it sounds unlikely on a new bike but possible.

I'm grasping at straws here! I would more than likely put the Makuni on it and double check all the seals around the carburetion system.

I can clearly hear that the bike wants to run, just be patient and go through the motions, you'll get it purring.

kyriakos · 04-24-2018, 09:26 PM

The good news (I think), on my way to the auto store to buy the compression tester, I got to 58 downhill

It couldn't hold though, generally seemed to settle in around 49 straight, 45 or so uphill in 5th gear.

I may have to find that mikuni somewhere other than Amazon, 30 days backordered there.

Ariel Red Hunter · 04-24-2018, 09:44 PM

Quote:

Originally Posted by kyriakos

The good news (I think), on my way to the auto store to buy the compression tester, I got to 58 downhill

It couldn't hold though, generally seemed to settle in around 49 straight, 45 or so uphill in 5th gear.

I may have to find that mikuni somewhere other than Amazon, 30 days backordered there.

You couldn't have the rear chain adjusted too tight, could you?..ARH

**JerryHawk250** · 04-25-2018, 08:13 AM

Motor does sound weak in the video. I don't know if you were giving it full throttle. I think once you get the new exhaust on it and tune for that you will notice a difference. Also once you get some miles on it and broke in you will notice an improvement in speed.

kyriakos · 04-25-2018, 08:38 AM

Chain has some play, but I'll loosen it a little more for additional testing.

Video was with WoT through each gear. I've also found a Mikuni on ebay. Either way, I'll report back findings with whatever appears to make the difference.

150 lb compression sounds reasonable to me; but I don't know these engines to know if that proves/disproves valve/ring leak.

I definitely appreciate everyone's thoughts on it. As frustrating this is to someone stubborn like me, fun factor is already exceeding expectations!

Megadan · 04-25-2018, 01:00 PM

Quote:

Originally Posted by jimwildman

Personally I found that gear setup too tall, probly fine on flat roads, but I got lots of hills and wind to fight against.

id rather be able to get the revs up to hold speed and go a bit slower. 45 is pitiful tho

I live in a very hilly (not small hills either) area well known for it's wind, and my bike is geared taller than his while carrying my much heavier body around, and I can hold 60mph all day long, with a head wind up a hill.

timcosby · 04-25-2018, 06:33 PM

that being full throttle it does sound weak like there is a restriction. check and make sure the air filter isnt soaked with oil as someone said it only holds a quart but manual says 1.6. if you had put in 1.6 it would of puked it into the air box and onto the filter which would restrict air. try running with out filter and you will know if thats it.

Megadan · 04-25-2018, 06:39 PM

My hawk holds 1.4 quarts to reach the center of the sight glass with the system completely drained. That means drain plug and filter screen cap removed and letting it sit to drain for several minutes.

kyriakos · 04-25-2018, 10:12 PM

I was able to put another 30 miles on tonight.

Checked air box, it's bone dry. Confirmed the intake from box to carb is also clear. Ran without the filter on, no difference.

I also ensured chain has a little play under load using a ratchet strap to simulate rider.

Also dropped a 120 main jet in, ran carb cleaner through all jets, everything seems clear for intake. The 120 jet didn't really have an effect either.

Have a multimeter, ground checks out across chassis.

Confirmed intake and exhaust valves are moving, holding that .003 lash on both.

I don't know if CDI or coil would have this effect, any way to check the output on these motors?

Really hoping exhaust is the issue, running slim on other thoughts...

04-24-2018, 07:51 PM	#17
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,578	Did you visually check to see if the slide is fully open in the WOT position? Is there excess slack in the throttle cable? __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
	1

04-24-2018, 08:01 PM	#20
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,578	I would do a compression test just to rule out if there's any issues with rings or leaking valves. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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04-24-2018, 09:26 PM	#23
kyriakos Join Date: Apr 2018 Posts: 22	The good news (I think), on my way to the auto store to buy the compression tester, I got to 58 downhill It couldn't hold though, generally seemed to settle in around 49 straight, 45 or so uphill in 5th gear. I may have to find that mikuni somewhere other than Amazon, 30 days backordered there. __________________ '17 Hawk / Mods: Mikuni 120/27.5, Airbox, .003 valve, 17f/45r, NGK Iridium, Aluminum Performance Exhaust
	0

04-25-2018, 08:13 AM	#25
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,578	Motor does sound weak in the video. I don't know if you were giving it full throttle. I think once you get the new exhaust on it and tune for that you will notice a difference. Also once you get some miles on it and broke in you will notice an improvement in speed. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
	0

04-25-2018, 08:38 AM	#26
kyriakos Join Date: Apr 2018 Posts: 22	Chain has some play, but I'll loosen it a little more for additional testing. Video was with WoT through each gear. I've also found a Mikuni on ebay. Either way, I'll report back findings with whatever appears to make the difference. 150 lb compression sounds reasonable to me; but I don't know these engines to know if that proves/disproves valve/ring leak. I definitely appreciate everyone's thoughts on it. As frustrating this is to someone stubborn like me, fun factor is already exceeding expectations! __________________ '17 Hawk / Mods: Mikuni 120/27.5, Airbox, .003 valve, 17f/45r, NGK Iridium, Aluminum Performance Exhaust
	2

04-24-2018, 09:20 PM	#22
Cravin01 Join Date: Jan 2018 Location: Forney Texas Posts: 498	Im think that if it drops the ball after 1/4 throttle in any gear with different jets that possibly your pulling in air through a screwed gasket. It may only happen after the engine develops more force (at a quarter turn) before it pulls in more air, it sounds unlikely on a new bike but possible. I'm grasping at straws here! I would more than likely put the Makuni on it and double check all the seals around the carburetion system. I can clearly hear that the bike wants to run, just be patient and go through the motions, you'll get it purring.
	0

04-25-2018, 06:33 PM	#28
timcosby Join Date: Nov 2016 Location: robertsdale alabama usa Posts: 1,007	that being full throttle it does sound weak like there is a restriction. check and make sure the air filter isnt soaked with oil as someone said it only holds a quart but manual says 1.6. if you had put in 1.6 it would of puked it into the air box and onto the filter which would restrict air. try running with out filter and you will know if thats it. __________________ 1991 harley heritage softail classic 2016 hawk kaw h1 400 tripple 13' long chopper in progress 2009 johnny pag bar hog 2004 hd electra glide ultra classic shriner edition 1997 harley davidson 1200 sportster 1972 harley davidson amf sx250
	1

04-25-2018, 06:39 PM	#29
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,040	My hawk holds 1.4 quarts to reach the center of the sight glass with the system completely drained. That means drain plug and filter screen cap removed and letting it sit to drain for several minutes. __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124
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04-25-2018, 10:12 PM	#30
kyriakos Join Date: Apr 2018 Posts: 22	I was able to put another 30 miles on tonight. Checked air box, it's bone dry. Confirmed the intake from box to carb is also clear. Ran without the filter on, no difference. I also ensured chain has a little play under load using a ratchet strap to simulate rider. Also dropped a 120 main jet in, ran carb cleaner through all jets, everything seems clear for intake. The 120 jet didn't really have an effect either. Have a multimeter, ground checks out across chassis. Confirmed intake and exhaust valves are moving, holding that .003 lash on both. I don't know if CDI or coil would have this effect, any way to check the output on these motors? Really hoping exhaust is the issue, running slim on other thoughts... __________________ '17 Hawk / Mods: Mikuni 120/27.5, Airbox, .003 valve, 17f/45r, NGK Iridium, Aluminum Performance Exhaust
	0