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eed help bike sputters bad

Old 10-28-2007, 05:21 AM
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eed help bike sputters bad

i was riding it the other day, practiceing some launches from a stop.. then my bike started running like crap, and then cut off on me.. i started it back up and now it runs very rough, give it throttle and it will bog out and then rev up high and go back down.. i just got the bike and ridden it 3 times.. any help and suggestions.. thanks a bunch..
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Old 10-28-2007, 06:03 AM
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Originally Posted by 98honda View Post
give it throttle and it will bog out and then rev up high and go back down..
Could you break that part down a little more? Is it doing the exact same thing every time or is it kind of random?
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Old 10-28-2007, 06:15 AM
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possibly picked up some bad gas or knocked off the vac for the fuel. check the petcock.
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Old 10-28-2007, 06:16 AM
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it does it all the time.. i can't ride the bike because it is so bad.. if i give it throttle, it will sputter up to rpm and then if i hold it there it will sputter down more and then the rpm will rise back up again while sputtering the whole time.. and will idle at about 500 rpm, and then shut off sometimes..
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Old 10-28-2007, 06:18 AM
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Originally Posted by twstd99 View Post
possibly picked up some bad gas or knocked off the vac for the fuel. check the petcock.

it was low on fuel, so i added more to it just to see if that was the problem.. and i lifted the tank, checked the filter and the hoses, and made sure that the petcock was on in the right direction..
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Old 10-28-2007, 06:21 AM
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Do you own a timing light?
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Old 10-28-2007, 06:22 AM
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yes i do..
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Old 10-28-2007, 06:34 AM
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Check in the knowledge base section of this forum for a copy of the vtr manual. Check the timing, I'm not an expert but I think this may be your issue.
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Old 10-28-2007, 06:36 AM
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timing or the coil? i'll look at it.. well it ran fine, and then all of a sudden it runs like crap.. i am kinda lost on it..
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Old 10-28-2007, 06:43 AM
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Very first thing I would check is to make sure both plugs are actually firing, then move on to the timing. It should also tell you how to check the coils in that manual.
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Old 10-28-2007, 06:45 AM
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ok, i am haveing problems viewing the manual..
thats what i was going to do today, was to put my timing light on each coil to check for fire.. i hope i get it fixed and don't have to pay the STEALER SHIP.. lol
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Old 10-28-2007, 06:47 AM
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LOL, don't waste your money...they will fix nothing at all and charge you $300 to do it.
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Old 10-28-2007, 06:51 AM
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i know or more.. i had a enduro that was doing about the same thing, i couldn't get it over 30 mph.. and they charged me about $160... i asked what was wrong? they said it needed a tune up.. it only had 1200 miles or so on it.. they changed the oil, filter, and spark plug, and 2-2.5 hours of labor.. what rip offs..
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Old 10-28-2007, 10:54 AM
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i had taken the gas tank off and the air filter apart, started it up and it's backfireing through the carbs, and out the exhaust.. so i guess it will be going to the dealer to get fixed.. i hate it, but i want to ride the damn thing..
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Old 10-28-2007, 12:34 PM
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years ago i had a bike that did what this sounds like.
took it to the dealer and it ending up being a main jet fell into the carb bowl.
id check into the carbs before going to dealer.
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Old 10-28-2007, 01:09 PM
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almost sounds like one cylinder's CCT could've broken/loosened up and the chain jumped a tooth or three.....just a thought.
You said you were practicing launches from a stop? You mean as in drag racing? Full throttle clutch dumps? or.....
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Old 10-28-2007, 01:41 PM
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Originally Posted by hawxter996 View Post
years ago i had a bike that did what this sounds like.
took it to the dealer and it ending up being a main jet fell into the carb bowl.
id check into the carbs before going to dealer.
i talked to a local guy here and he said it could be the trash or dirt in the carbs..

Originally Posted by redman View Post
almost sounds like one cylinder's CCT could've broken/loosened up and the chain jumped a tooth or three.....just a thought.
You said you were practicing launches from a stop? You mean as in drag racing? Full throttle clutch dumps? or.....
yes launching for drag racing, not full throttle dumps. reving to about 3-4k and slipping out the clutch.. i knida wonder if it is trash in the carbs, it was kinda low on fuel..
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Old 10-28-2007, 10:48 PM
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let's hope so........
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Old 10-29-2007, 04:25 AM
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If you have only one cylinder affected, I'd +1 the clogged jet option, since you have backfires, I suppose the offending cylinder is firing, but is lean
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Old 10-29-2007, 06:37 AM
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I had the same thing while doing the same thing (hard drag strip style launching). Bike ran like ca-ca-poo-poo (technical term) and took me forever to figure out. Basically was running on one cylinder and wouldn't rev out at all.

It ended up being a sticking carb slide.
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Old 10-29-2007, 01:29 PM
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DONT PAY TO TAKE IT TO THE DEALER> DO IT YOURSELF AND GET FAMILIAR WITH YOUR TOY> there is plenty of knowledgable ppl here on this forum to help you out. the carbs are easy to take out and apart on the hawk, once you do it you will be asking yourself why would i ever take it to someone. take the carbs apart and all the fun stuff in them, and place all the parts in in 2 separate bins labeling frnt and rear. clean the carbs out good with carb cleaner and compressed air. make sure the float levels are good and all seals and diaphrams are not ripped or torn. (DONT SEPARATE THE CARBS). put all back together and see how it runs. after that if not running right check the timing. these hawks like to pick up some nasty gas once in a while.
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Old 10-29-2007, 06:51 PM
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i took the tank off, and the airbox.. looked at the carbs, they have some type of black slideing thing that moves back and forth.. put it all back together and it still does the same thing..

while it was running i unplugged the front spark plug, and it didn't change the way it was idileing.. hmm, i checked for spark from the ignition wire, it was good... took out the spark plug, it was black, plugged it into the spark plug wire and started it.. it was sparking like crazy.. so i think the ploblem is in the front cylinder somewhere.. while it was running awhile, i touched the front exhaust and it wasn't as hot as the rear.. i realy don't know what else to do but take it to some one.. unless i just take everything apart like you said, and see if i can put it all back together again..
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Old 10-29-2007, 07:01 PM
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My guess is that the front carb overflowed but the gas stayed in the line instead of escaping and ended up flooding the front cylinder and fouling the plug. Try new plugs and rerouting the vent tube for the front carb.

Last edited by killer5280; 10-29-2007 at 07:04 PM.
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Old 10-29-2007, 07:21 PM
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Yeah the front cylinder is pig rich, so are this slide coming down like the other, if so I'd check for a gas overflow like killer said, a piece of crap could be stuck in the float needle or some other funky hapening
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Old 10-29-2007, 07:35 PM
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When you had the carbs off did you notice if the float bowl vent lines went into the carb stays (the plates that hold the two carbs together) and crossed between the carbs? There was a Honda notice (in 98, I believe they fixed the problem in later models) that addressed the problem of the front cyl. dying after hard braking. The problem was that the holes in the carb stays were a little too small and slightly pinched the float bowl vent lines causing the rear carb to puke fuel into the front carb and flooding the front cyl. The factory fix was to re route the float bowl vent lines outside of the stays. This might be the problem you are dealing with. YMMV
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Old 10-30-2007, 09:47 AM
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thanks, i will look into it again..
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