DTSFab.com (Desert, Trail and Sand)
UTV's Off Road ( RZR, YXZ, Mini Buggy, Carts,etc.) => UTV Motor and Drivetrain => Topic started by: Stomper on December 31, 2009, 06:24:29 AM
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This is about my sled but could be buggy related. Last year I blew up my sled engine, so I rebuilt it. I did a complete overhaul on the engine chaincase and suspenssion. Everything was new, bearings, seals, gaskets, fuel lines, oil lines and filters, plugs. Everything!!
It has had a bog issue at around 6500 rpm from the start since it was rebuilt. I cleaned the carbs 4 times all together, I cleaned the clutches, I changed the clutches, I changed the clip setting on the jet needle, I checked the timing, I tried eveything and nothing worked. After exhausting all of my options and after being extremly frustrated, I was sitting having a rum, that seems to fix everything, and thought, the only thing that I didn't do was change the plugs. But why should I they are brand new. I changed them any way. Guess what? It purrs like a kitten now. Must have been a dud from the factory
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Who overhauled the engine?
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That is extremely common in the 2 stroke community :P
2 strokes will foul a weak plug in just a few seconds ...Lots of times you can pull the bad plug, replace it with a good one, once the motor is warmed up put the bad plug back in...and it will be fine
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I did
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SPecs got a point and I have had similar problems with my race engines. IMO it happens due to many times having a bit of oil hiding above the top ring and below the piston top. You can wipe all you can get to before bolting the head/s on but you can't get it all. Soo as the engine fires the oil gets slung around and finds a plug gap. Pffftttt,out goes the spark. Then it's a hit(pun) or miss(another pu ;)) New plug cures all . I feel that is one of the main reasons a freshly rebuilt engine with no additional mods many times will destroy a perfectly good engine. You know,the guys that think sitting in the drive and rapping the shit out of it will somehow miraculously make it run right. If it continues to occur I'd look into my ignition amplifiers and triggers.