helping out with my uncles 400
#1
helping out with my uncles 400
my uncle isnt what u call a machanic at all and his sport 400 is running like crap ( i think jetting) he gots a rcr pipe and a clutch kit he got a guy to put it in for him and do the jetting well i dont think the guy new what he was doing b/c now after you are almost at half throotle- full throotle it feels like its going to bog out a lil bit....well the question is if it is the jetting can u tell me what size jet he should be running and also where the clips and all of the other stuff should be sat at....b/c he bringing it up for me to fix it and take her for a few rides and i really want to get it fixed to see how it rides b/c im thinking about getting it off of him
#2
helping out with my uncles 400
I had the same prob when tuning my carb. First start it up and run it full throttle for about 100 feet, shut it off and then stop. Pull the plug, odds are it is going to be black or a dark brown. If that is the case then drop the main jet down one at a time until that spark plug is a light brown. Personally I like to keep mine on the dark side, that way it wont run lean and burn up the motor. I would rather put in a new plug then replace pistons or worse...
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