Hawk 250 won’t rev

tj639 · 06-20-2019, 03:30 PM

Bought a hawk change to a vm26 carb put in a 115 main jet was running good. Got the aftermarket exhaust and pod air filter today installed both. And now can’t get engine to rev up. Low rpms seem fine. Adjusted the valves and moved up to the 125 main jet and add 2 washers to the needle didn’t seem to change anything. Would getting bigger pilot jets help?

**JerryHawk250** · 06-20-2019, 03:31 PM

Check that the choke is not on half way.

Azhule · 06-20-2019, 04:06 PM

Good time to check the o-rings/seals on the carb and intake/engine flange (cheap Chinese o-rings like to shrink over time), air leaks between the engine and carb can cause some funny things to happen also

timcosby · 07-01-2019, 11:08 AM

your new carb choke may be opposite of the oem

NzBrakelathes · 07-01-2019, 09:52 PM

Remove pod filter as some block air flow!!

Ariel Red Hunter · 07-01-2019, 10:36 PM

Quote:

Originally Posted by tj639

Bought a hawk change to a vm26 carb put in a 115 main jet was running good. Got the aftermarket exhaust and pod air filter today installed both. And now can’t get engine to rev up. Low rpms seem fine. Adjusted the valves and moved up to the 125 main jet and add 2 washers to the needle didn’t seem to change anything. Would getting bigger pilot jets help?

No. What I would do is change back to a 115 main jet and remove the air filter and see how it runs. And you can chalk this little experience up to that old saw "only change one thing at a time." Remember that, and you will be much more successful in your search for more power...ARH

NzBrakelathes · 07-01-2019, 11:05 PM

Tuning the stock carb or mikuni or any other won’t work unless you understand things better
Kinda what I’ve said in the past n learning on the stock carb is a good starting point etc

Megadan · 07-01-2019, 11:43 PM

Quote:

Originally Posted by timcosby

your new carb choke may be opposite of the oem

This. Very common mistake people make when installing the mikuni clones. Their chokes operate the.opposite of the stock carb.

Also, as Jerry said, if the choke is on half ir will be fine at low rpm/ throttle, but will be too restricted beyond that and... choke out.

06-20-2019, 03:30 PM	#1
tj639 Join Date: Jun 2019 Posts: 1	Hawk 250 won’t rev Bought a hawk change to a vm26 carb put in a 115 main jet was running good. Got the aftermarket exhaust and pod air filter today installed both. And now can’t get engine to rev up. Low rpms seem fine. Adjusted the valves and moved up to the 125 main jet and add 2 washers to the needle didn’t seem to change anything. Would getting bigger pilot jets help?
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06-20-2019, 03:31 PM	#2
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,553	Check that the choke is not on half way. __________________ 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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06-20-2019, 04:06 PM	#3
Azhule Join Date: Dec 2015 Location: CO Posts: 1,525	Good time to check the o-rings/seals on the carb and intake/engine flange (cheap Chinese o-rings like to shrink over time), air leaks between the engine and carb can cause some funny things to happen also __________________ "Think as you like... but this self proclaimed Professor is always right" - Buckshot "You never know what someone is hiding beneath their smile..." - NinjaTom - R.I.P.
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07-01-2019, 11:08 AM	#4
timcosby Join Date: Nov 2016 Location: robertsdale alabama usa Posts: 1,007	your new carb choke may be opposite of the oem __________________ 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
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07-01-2019, 09:52 PM	#5
NzBrakelathes Join Date: Jun 2016 Location: Hell Posts: 2,408	Remove pod filter as some block air flow!!
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07-01-2019, 11:05 PM	#7
NzBrakelathes Join Date: Jun 2016 Location: Hell Posts: 2,408	Tuning the stock carb or mikuni or any other won’t work unless you understand things better Kinda what I’ve said in the past n learning on the stock carb is a good starting point etc
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