- Sep 7, 2003
Hello Everybody,I have a 1991 KDX 250,I just bought it a couple of months ago,until last weekend I had not been any where to really hit hard through all the gears,full open,The first time down the flat track it started to bog down at the top end of first and would not clean out,by the time I got to third it was more or less just coasting.When I stopped it wouldn't even fire.The plug was trashed.The only other time I fouled a plug was when I changed oil types,and mixed it to rich. I went through two plugs the same way,flat draging.Until now it has always had no problem at top end on short burst.I'm running BelRay MC1 at 50:1(the other plug was at dealer rec. 32:1) FMF pipe and silencer,The last owner didn't say anything about any other mods other than pipe.Any sugestions appreciated!!!!