08-05-2017, 12:32 AM | #1 |
Join Date: Aug 2017
Location: Iowa
Posts: 5
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2017 Rps hawk 250 red hot header help
I need help. I dont do much with the internet an took me an hour to figure out how to post on here............
But I have a 2017 hawk 250 with 190 miles on it. I just installed..... mikuni vm26 with (120) jet, NGK iridum, full exhaust and did the air box mod. When i start it up it only takes 20 seconds or so and the header gets CHERRY RED HOT. So i shut it off. What is causing this?? I tried puting a 125 main jet in it and playing with the air/fuel screw, tried using the old spark plug, checked valve lash, ect ect.... Im afraid to run it long enough to get the air/fuel mix set so it will idle at lower rpms. (Pry 1500-200rpms now) Is it super lean or does this exhaust pipe just get that hot cas its cheap and thin? I dont want to drop a valve or anything |
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08-05-2017, 01:51 AM | #2 |
Join Date: Jan 2016
Location: central illinois
Posts: 362
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sounds like the exhaust is clogged, or the timing is off ... i would not run it ... i run a 115/40 setup and it is rich, not lean ... i would start with the back half of the exhaust, because it is easy to get off of the bike, and you can run it without it, unlike the header ... but my best guess is the cat is going to be clogged/smashed inside ... if you or a buddy can weld good, i would cut the guts out of the cat asap anyway
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08-05-2017, 03:18 AM | #4 |
Join Date: Jan 2012
Location: ChCh , NZ
Posts: 2,266
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Ok.... 20 seconds is pretty dam quick..
a bike will glow the header if it is sitting idleing for a while..theres no airflow to cool it both my bikes do it.. but it takes longer than 20 seconds..A lot longer.. do you have any idea what the wall thickness of the header is ? stainless steel heats up alot faster/easyer than steel.. can't give you any jetting help... don't have a hawk .. anything would only be second hand info you can find here.. But I assume it is doing it at idle... so if it is jetting it's most lightly to be the pilot jet.. also check for a air leak at the motor/exhaust join... .
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08-05-2017, 09:51 AM | #5 |
Join Date: Jun 2011
Posts: 1,335
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Hot exhaust is caused by a lean condition or valves being out of adjustment.
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08-05-2017, 10:08 AM | #6 |
Join Date: Oct 2015
Location: connecticut
Posts: 980
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Did it do this before the mods? If not, i' m suspect of the new exhaust or plug. Try putting some of the old stuff back on then mod 1 thing at a time.
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08-05-2017, 12:43 PM | #7 |
Join Date: Aug 2017
Location: Iowa
Posts: 5
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Valves adjusted correctly. I dont think it was hot before the mods. Im going to try modding the factory carb and see if it still does it
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08-05-2017, 04:05 PM | #8 |
Join Date: Jun 2011
Posts: 1,335
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If the new exhaust's tubing is thinner than the original exhaust, it will get hot faster.
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08-05-2017, 05:58 PM | #10 |
Join Date: Oct 2015
Location: connecticut
Posts: 980
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What slot was the VM26 groove set to?
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Tags |
hawk, mod, tune, upgrade |
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