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99 has spark but won't run

This is a discussion on 99 has spark but won't run within the Yamaha YFM350 Raptor/Warrior ('87-Present) forums, part of the Performance /Technical category; i'm a newbie so here it goes... i just bought a 99 warrior at a good price thinking that it might be worth the time ...


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Old 05-08-2010, 04:41 PM   #1
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Default 99 has spark but won't run

i'm a newbie so here it goes... i just bought a 99 warrior at a good price thinking that it might be worth the time to fix it up. it is getting spark and has good compression, i guess but there is no gas getting to the plug. every once in awhile, backfire but thats about it. i cleaned the carb pretty good and changed the fuel lines and filter put fresh 93gas and still nothing. so now its on ya'll, what can i do to get riding? the guy told me it had been sitting for awhile but idk if i believe him now. he also said it has a big bore kit and stroked w/ a mikuni carb. what is it gonna cost to fix whats wrong?
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Old 05-08-2010, 11:34 PM   #2
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first things first. you have spark and comp, good. is fuel getting through the line and into the carb? there is a bowl drain screw that will tell you if you are getting gas. if your carb has gas, remove your airfilter from the airbox and cover the hole going to the carb. try starting the engine. if it starts and runs by hand choking, it could be one of several issues. the first is whether the carb is clean. some carbs are really easy to clean while others are a major pain. next will be the intake boot between the head and carb. this is tested by restoring the breather assembly and spraying some carb cleaner at the boot while the engine is running. if the engine revs, you have a leak, replace the boot. if not, check your idle set and mix set.
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Old 05-10-2010, 03:07 PM   #3
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well i've done all that and more... the carb is spotless, its a mikuni slide carb and its all operating fine. i've tryed to roll start it in 5 or 6 pulling it with the truck but all i get is a bunch of backfire???? its in the shop now being diagnosed so i'll let ya'll kno what they say...
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Old 05-10-2010, 03:18 PM   #4
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make sure they keep ahold of the 'bad' parts. some shops will say this and that are bad, and leave them in place while still charging you for supposed good ones.
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Old 05-10-2010, 04:27 PM   #5
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oh i kno this, i've taking parts(stator,coil) to be tested and they tell me its bad but later down the road i find out(cdi) they just wanted to make a couple bucks since i wasnt bringing it to them to do the work

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Old 05-12-2010, 11:54 PM   #6
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i'm now in the same boat! pos warriors.
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