Rough Running Isues
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Posts: 227
From: Arnold Missouri
Rough Running Isues
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My '98 Hawk pops at idle, backfires through the carbs at steady low RPMs and tries to die at stoplights. I bought the Hawk with 31000 miles and no service records. It has fresh gas. I performed a bafflectomy last week other than that I think it is stock. Where should I start.
My '98 Hawk pops at idle, backfires through the carbs at steady low RPMs and tries to die at stoplights. I bought the Hawk with 31000 miles and no service records. It has fresh gas. I performed a bafflectomy last week other than that I think it is stock. Where should I start.
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SuperBike
Joined: Jul 2005
Posts: 1,548
From: MN
how long have you had it? was it stored recently and when was it last running great? If its new to you and you have no idea you could start with routine maintenance items including checking plugs, cables, carb synch and adjusting the fuel mixture settings if you are sure the carbs are clean.
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From: Arnold Missouri
Heres what I found so far. The spark plugs are NGK DR8ES-L. The air funnels (velocity stacks?) were reversed. Someone has been in there before and didn't use the right size phillips or was a muscle head on the screws. Tonight I will pull the carbs and see how they look. Thanks for the advice on the vacuum leak, I will check that when I put it back together.
Thanks,
Matt
Thanks,
Matt
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SuperSport
SuperSport
Joined: Dec 2006
Posts: 880
From: Victoriaville, Quebec, Canada
Check the jets for cleanliness, set idle screws to 2.5 turns check the mains and pilot jets size, check if the needles are adjustable, if so use the 3 rd notch from the needle body, use a cover screw to pull the needle assembly off the slide.
Good luck
Good luck
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From: Arnold Missouri
Last night I opened the carbs to see what the previous owner had screwed up in there
. The jets were 178 front, 175 rear. Isn't that backwards? At least they were clean. Where does the vacuum line connect to the petcock, bottom or rear? I put it on the rear. I got it back together last night and started it. Sounded much better for the short time I let it run.
. The jets were 178 front, 175 rear. Isn't that backwards? At least they were clean. Where does the vacuum line connect to the petcock, bottom or rear? I put it on the rear. I got it back together last night and started it. Sounded much better for the short time I let it run.
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From: Arnold Missouri
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From: Arnold Missouri
I removed it before reassembly.
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Squid
Joined: Aug 2005
Posts: 17
From: Wittmann, Az
petcock vacuum
Make sure you put the vacuum line to the back of the petcock where the tube points to the left not the to the one pointing straight down, the one pointing down that was a 750 dollar lesson for me.
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From: Arnold Missouri
Wow! I thought it quick before.....now it screams.
Just got the correct plugs, so they will go in this weekend. Now I can work on the other "repairs" that were made by the previous owner(s). I will post pictures of theses "repairs" in another thread.
Just got the correct plugs, so they will go in this weekend. Now I can work on the other "repairs" that were made by the previous owner(s). I will post pictures of theses "repairs" in another thread.
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geekonamotorcycle
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