Bad Bog

[Patrick Hubbell]

Has anyone experienced a bad bog off the corners with their Leopard? I can't get rid of this condition. I have tried rich and I have tried lean on the mixture. The plug, piston crown and inside of the header show a rich condition wit hthe Low speed needle set at 1 turn and the high speed needle at at 7/8.

WHen I try 1-1/2 turns on the low speed the engine loads up real bad and chugs untill it clears out, but i still get the bog off the corners. It's bad, at the IKF race Sunday I was passed by 5-6 karts on the start.

I have inspected the inside of the clutch, nothing out of place there. The engine is stock, I cleaned out the fuel inlet screen. I haven't checked the pop-off yet. The pipe length is at 410. The reeds are new and are all still intact, no missing pieces and they are sealing.

Any thoughts would be greatly appreciated.
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Patrick Hubbell

[Marc Elliott]

it could be a shorting spark plug cap, i had this happen, or a bad plug
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California 4 Stroke Racing
www.california4strokeracing.com
Vampire-Oral 4-Stroke Engines

[Doug Ring]

Patrick -

I have only three outings with the Leopard, so I am far from an expert, but I experienced the same condition at Buttonwillow during the practice - squeeze the gas coming out of a turn, the motor bogs and pretty much tries to die, I can keep it going by stabbing the throttle, clears up after about 1 second and then works fine - until the exit of the next turn.

I ended up leaning out the carb more than expected - 1 1/8 on low and 7/8 on high - and things ran well for the rest of the day. Conditions at Buttonwillow that day were pretty "heavy" - high humidity, cool temps - so my impression is that the Leopard likes it on the lean side. If it's at all like the HPV, it'll tell you when you are too lean by not pulling at the end of the straight - just sort of fall off, as opposed to chugging as you see in a rich condition.

Of course, if we were back in KT100's, the lean condition would be indicated by a hole in the top of the piston and a smiling motor builder

[Matt Mendenhall]

Iknow this sounds obvious but where your arms covering the holes on the airbox? I used to do it all of the time in my sprinter when we went to those things. I'd get in the turn and start the "chicken wing" and it would fall on it's nose, then I would look over to see what was going on and off it would go again. Needles to say we changed everything on the kart twice before realizing that the dummy behind the wheel was the problem.

[Randolph Ferguson]

Maybe take a at your black box. If it is bad, it could still run (even though not very well.).

RF