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By Ed Zeppeli
I picked up this quad after the previous owner couldn't get it going.
The issue is that I can't get it to fire at idle or at all.
- replaced plug. Decent blue spark. Also tested with spark tester inline.
- rebuilt the carb. PO had already bypassed vacuum lines from petcock. There's fuel at the cylinder
- Checked compression with new gauge. reads 190 psi
- cleaned all contacts I could access.
- am currently jumping with car battery. Solenoid jumpered.
- checked cam timing at TDC and adjusted valve lash
- put gas directly into cylinder to see if it will fire at least momentarily
Motor turns over well. Plug gets wet.
Motor may fire once or twice but smokes through exhaust a bit as if it's trying to fire or combusting.
This leads me to suspect timing. As mentioned I checked the flywheel mark versus cam marks. Perhaps someone has been in there before because I can't find a 'T' on the flywheel but there is a very visible paint mark which aligns with TDC position on piston. Possibly a slipped flywheel/woodruff?
Is it possible that if it had seen previous repairs, that the timing could still be off? I'm reluctant to dig into the flywheel/stator area if there's something else I could have missed but all signs point me to that area. Would a bad CDI cause spark timing to be off?
Anywhere else to diagnose incorrect spark timing?
I've scoured these forums and elsewhere but I'm posting just in case there's something I've overlooked up until now.
Thanks very much for reading!
By Jeff Wolf
Bought a nonrunning 1996 bayou 400. Tore down engine and found major problems. Piston is damaged and cylinder liner needs replacing. Looks like cause was a broken oil pump gear.
Question is can a piston from a prairie 400 be used? Is it the same engine? I assume the liner is replaceable?
New user and first time quad owner. I recently got a 2000 Polaris Sportsman 500 and am really excited to start working on it! I work in IT for a living and am an experienced mechanic, so at least I am not starting at 0 haha. Looking forward to hanging out and getting to know everybody!
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By Zacharia Maisonneuve
i have a 1993 timberwolf yamaha and the compression is good and lights work but for some reason the electricity is not going to the spark plug(s)! i got a friend to check it out and they said its no use but im not giving up! please help with this!
By Connor Tuftin
I have a 1988 300 Honda FourTrax, All wheel drive.
My brother and I were fixing up this quad. We put a brand new battery and fuses in and it was running fine until we put the quad into reverse. As soon as it was put into reverse all of the electrical cut out and power wasn't making it to the head unit anymore and both of the brand new fuses popped. We figured there might have been a short from the starter or solenoids, but they are all working properly. At this point we don't know where to start looking for where the short could be. I'm just wondering if anybody has had the same issue or knows of similar issues that could cause these electrical shorts?
By Resurgence Small Engine Inc.
Not satisfied with the commercially available versions, Jonathan recently built an ATV spring compressor.
In this video, he demonstrates using it to remove & re-install the spring on an ATV coil-over shock absorber.
Mistake in video - the coil-over shock is not quite a McPherson strut.
If you are inspired to build your own spring compressor, feel welcome to use any ideas from this video.
Thanks for watching! Resurgence Small Engine Inc.
By Robert Ochoa
Don't worry about hauling the ATVs. We have the helmets, goggles, and gloves covered too. Our equipment is well maintained and gassed up ready to go!
We take the work out of your fun!
Book your next adventure now!
#fourwheeler #atvlife #atvriding #atv #4wheeling #fourwheeling #mudding #outdooradventure #atvs #mudlife #powersports #northcarolina #southcarolina #southcarolinalife #offroading #AwesomeATVRentals #yamaha
Gibbs Technologies Ltd, the world’s only High Speed Amphibian (HSA) technology specialist, today unveiled a prototype of the first commercially viable high-speed amphibian Quadbike/All Terrain Vehicle (ATV) - Quadski.
Quadski is the third demonstration of Gibbs’ HSA technology following the successes of the Aquada and the Humdinga. It is capable of travelling up to 50 mph (72 kph) on land and water and makes the transition at the flick of a switch.
Commenting on the launch of the Quadski prototype, Alan Gibbs, the founder of UK based Gibbs Technologies Ltd. said, “Quadski is both exciting and practical with a multitude of uses”.
“I know consumers will love the fun of driving a Quadski on land one minute and then head straight into the sea or river the next. But there is a very serious side to Quadski as well: emergency services and aid workers will be able to reach areas and people no two or four wheel drive vehicle could reach.”
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