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#1 |
Join Date: Jul 2016
Location: Dallas, Tx.
Posts: 10
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Hawk 250 Engine is Bogging
Howdy Y'all,
Like most my first post will be a request for help. So about 900 miles into my new Hawk 250. She starts to lightly bog down in all gears while i'm cruising. Then starts to increase in severity over time. She would (and still is) completely bog down and give me noting after a 1/4 turn. Then with a FOT either die or take off like a rocket. I pulled the plug and was covered in black soot. So I'm thinking its too rich. Change the spark plug and fiddle with the stock carb but no change. Order in the mikuni carb. She idles and revs good but no change after a 1/4 turn. I drop the jet needle down a few notches to lean it up. No change. ![]() ![]() Now this is my first time tuning a carb and it's driving me crazy!! I'm pretty sure my problem is its too rich and it's flooding the engine after a 1/4 turn. Or I'm might not be getting enough air. But now I'm starting to question everything. I go into it think "Ok I get it. I know what's going on". To " DEAR GOD I'M GOING TO SET THIS BIKE ON FIRE AND WATCH IT BURN!!" ![]() So any insight or thoughts on what else might be going on would be awesome!! ![]() |
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#2 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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If you light it on fire, please capture it on video.
It sounds like the CDI is failing; it happens. The symptom hasn't changed with all of the steps you've taken, so I'd look at the electrical side. The only way to troubleshoot a CDI is to buy another one. Just for conversation, what have you done with the air filter to troubleshoot?
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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#3 |
Join Date: May 2016
Location: Hacienda Heights, Ca
Posts: 281
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I suspect an ignition issue or maybe tight valves.
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#4 |
Join Date: Jul 2016
Location: Dallas, Tx.
Posts: 10
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What valves are you referring to?
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#5 |
Join Date: May 2016
Posts: 231
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I had real bad bogging such that I couldn't get past 40 mph. my issue ended up being I did the valve adjustment on the wrong stroke. If you didn't adjust the valves I would do it.
The valves are at the top of engine and come very tight from the factory.
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Hawk 250 with following performance mods: 17t, Mikuni with 110/25, Uni filter, Exhaust. |
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#6 |
Join Date: May 2016
Location: Hacienda Heights, Ca
Posts: 281
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Intake/exhaust valves in the cylinder head.
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#7 | |
Join Date: Jul 2016
Location: Dallas, Tx.
Posts: 10
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Quote:
If it comes to the torch and burn I'll make sure to record it. ![]() |
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#8 | |
Join Date: Dec 2014
Location: Deerfield Beach FL
Posts: 1,410
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Quote:
"the chokes not open" Many people seem to be confused or get confused or not know open/close for their particular bike or just a wording/terminology thing. Your choke should be fully open. No air restriction at all. Take the air cleaner intake tube off if you need to look inside the carb to verify how the choke plate opens and closes. Make sure your choke is full open. The internet says a cold start choke should never even be needed for a properly tuned bike in any air temperature over 50 degrees or so. Fully open choke. (dont pay any attention to the red arrow) ![]() Fully closed choke. Will make your bike run way rich and no power and flooded and dirty plug and no adjustment etc etc. ![]() / Last edited by Adjuster; 08-23-2016 at 03:42 PM. |
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#9 |
Join Date: Sep 2014
Posts: 1,907
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Could be that the main jet fell out and is laying in the float bowl.
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#10 |
Join Date: May 2016
Location: Hacienda Heights, Ca
Posts: 281
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On both carbs? Highly unlikely.
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#11 |
Join Date: Mar 2010
Location: Volcano, Ca
Posts: 7,112
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I'm throwing my bet at the choke is in the half-closed position? That would account for the sooty plug with the super lean jetting....and I'm with Weld, if you torch it, please post a vid. ;-)
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"Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350 |
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#12 | |
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
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Quote:
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#13 |
Join Date: Jun 2010
Posts: 380
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Check the electrical connection / feed to the coil....
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#14 |
Join Date: Dec 2015
Location: CO
Posts: 1,525
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I would start by adjusting the valves, with you asking "what valves" makes me wonder if they ever have been adjusted properly
![]() Check out "Motocheez" on youtube, he has some great videos out on the HAWK... make sure you "watch and read" anything that pops up in his videos, he has made a few mistakes here and there but he always corrects them... sometimes he corrects the problems with wording that pops up on his videos Either way, watch this video, and set your valves (with an ICE COLD engine)... get back to us if it helps any or not ![]()
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"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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#15 | |
Join Date: Jul 2016
Location: Dallas, Tx.
Posts: 10
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Quote:
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Tags |
bogging, carburetor, hawk 250 |
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