reknelb

My experience with wiseco's = EXAMPLE; If you order 70mm pistons, your bored and honed hole will end up being 70mm, and your piston will be smaller by the amount of the recommended clearence. I ran into this problem once. I had a pair of cylinders that measured about .003" over 65.5mm. I called wiseco and asked if thier pistons were exactly 65.5mm OR if they were smaller. They said they would measure exactly 65.5mm. Well needless to say when they came they measured about .003" under 65.5mm. That would have given me about .006" clearence, so i sent them back and went next size up and had the holes opened.

I notice on alot of dirt bikes when they start overboring they also have the head machined to match (squish angle and such.) I'm helping a friend rebuild his 1mm over engine and was wondering if this was something that you banshee gents do also. When you buy a hot rods crank, does it come ready to drop in and is it welded? Thanks in advance.

We are going to do a plug chop after he gets it all back together. Want to get it idling and starting a little better first. He's gonna grab some jets and we'll start with 280's. Thanks for the suggestions, the 240 just seemed a little lean after doing some searches in this jetting section. Feel free to keep giving suggestions for this set-up or had experience with a similar set-up.

A buddy of mine picked up a banshee a few weeks ago. He's in the process of putting all new bushings and bearings in the chassis. I told him he should have a look at the jetting because it didnt seem like it started very good and it doesn't want to idle at all. So I was over and pulled one carb off to have a look, the slide was in backwards. Cutaway was facing the engine So, I pulled both carbs, opened them both up. Mains were 230, middle/3rd clip on stock needle, 27.5 pilots, 1.2 turns on air screw. Float height was a little low (.790" spec=.800"-.880") 300-600 ft above sea level, avg. temp 55-75 F. Stock timing, 50/50 mix 40:1. I think he's running that castor927. Reeds were good, new plugs. Engine has fresh top-end .5mm over wiseco's, v-force 2 , .010" milled off head, fmf pipes and silencers, k+n filter in box with lid. I think the pipes are gnarleys, they are the black painted ones not the nikle plated. I'm not really familiar with the effects some of these mods would have on the banshee engine. On my dirt bike, aftermarket reed cages and pipes tend to need leaner jetting. Just from reading the forum here I can see that is not true with the SHee. What effect would the milled head have as far as jetting is concerned? I slapped some 240 mains in, left the needle in the middle, left the pilots 27.5, turned the air screws to 1.5, and set the float height to .850" Think that will be ok for a starting point, or should i have him throw some bigger mains in? Seems like alot of folks here are running 270-300 mains, should I have him start somewhere in that range?