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91 Suzuki Kingquad 300 low compression, wont start


bsfs1988

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Hey guys hope everyone is well. I need sum advice or help. Anyways I already rebuilt the carb however I noticed that the carb is spitting sum gas towards the airbox and i did a compression test and i only got 50lbs what should the compression be for these lil monsters bc 50 lbs isn't a lot I figure it will b around 100lb or so. So I'm thinkn a piston,bad valves? it does smoke white but I can get it to run but hard to start and I got to keep the slide all the way open on the carb to get it to even run but once I let the slide down it cuts off so its not even driveable right now plz help me guys trying to get it running b4 we get snow

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Thanks guys unfortunately I dnt have a book so I dnt know how to check timing and valves I'm pretty much doin this with out a book and mainly guess wrk. It does have around 5k miles on her and the recent owner didn't maintain it very well. Any tips on how to check that stuff. If I have to break it down anyone know where I can get a good performance cam for it and get it bored to next size hopefully that will give me sum extra power

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So I set my valves again and it cranked up first time it ran about 2 mins then cut off I got valves set int .004 exhaust .005 I put it on tdc by taking plug out and feeling for air then use the hand starter to put piston on top I got needle jet about 2.5 turns out should I turn it in some so I can get it to idle. And got new spark plug gapped at .26 any tips guys or ideas what I should do or check

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What's up ox. Naw I dnt know y it shut off. When I reset the valves she cranked as soon as I turned it over. I do have my air mix screw turned all the way in til I can get it to idle and get it set however when it did crank it didn't idle high with the air mixture all the way in which it shud have. I'm thinking its fuel problem bc when I took old plug out it was extremely black and had residue on it as well so burning rich right?. I got the needle jet set at 2.5 turns out frm seated. It's almost bck to same problem it will crank if I raise the slider half way up to give it more air

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I got it to idle and kinda wnts to bog when I give it gas then after playing with it a while I can give it gas however when I give it full throttle for about a min she will cut off and I noticed the float bowl is completely dry! Any ideas ? Bad float or bad float spacing or sumthn

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  • 2 weeks later...

Could be bad fuel lines or fuel filter/pump. Pilot screw setting might be closed too. And your going to want the valves a 6 thousandths and maybe even 7 thousandths for the exhaust valve because it will expand a little with the heat.

And make sure you run premium fuel in there because anything else is terrible on the carbs

Edited by Thayer40
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