02Bansheeee Posted August 6, 2014 Report Share Posted August 6, 2014 My brother and I fully rebuilt his 99 Shee. But while switching cylinders I noticed that after it had been broke in, the rubber plug on the bottom of the cylinder wasn't installed into the new cylinder on the bike. We are gonna take that cylinder back off to put it back in but that might have something to do with my problem... It was originally a stock 64 and he found some 66.5 cylinders and pistons. We Installed those and it ran until the day after a big family ride for about 4 hours. It started normal and ran normal until it got warmed up.. Too warm. I noticed that the clutch cover was too hot to touch and then bogged out and wouldn't start until the whole bike was cool. The pipes are a greenish-blueish color at the header and the plugs are black and dry. I think it's overheating. Could it be because we upped the pistons so big without rejetting or porting? Or water pump? Any helpful replies are appreciated. & it know that we should have double checked before making a stupid mistake such as the rubber boot, don't need to know that. Quote Link to comment Share on other sites More sharing options...
02Bansheeee Posted August 6, 2014 Author Report Share Posted August 6, 2014 It ran fine until the day of our family big ride***** typo above Quote Link to comment Share on other sites More sharing options...
bigweav81 Posted August 6, 2014 Report Share Posted August 6, 2014 id guess being that the rubber boot is there to block the cylinders coolant passage it couldn't cool properly. you don't need to know that, sounds like you may need to know something. could've fried that new top end if it was over heated enough. Quote Link to comment Share on other sites More sharing options...
WINDYCITYJOHN400 Posted August 6, 2014 Report Share Posted August 6, 2014 Motor got bigger…..didn't re-jet the new combo…... Might have had an air leak after the rebuild…. No mention of piston to cylinder wall clearances or ring gaps on rebuilt combo….. Burndown. Sadly a common story. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted August 7, 2014 Report Share Posted August 7, 2014 Even worse, you bought 66.5 cyls and torched them. Now you need to buy new ones. Or did you keep the stock 64mm bore ones around? If that's the case get them freshened up. Order new coolant plugs, gaskets and seals. Refresh the waterpump as well. Quote Link to comment Share on other sites More sharing options...
02Bansheeee Posted August 15, 2014 Author Report Share Posted August 15, 2014 Thanks for your replys, just got back from vacation. I checked the compression, it was 100 in both cylinders. Pulled the head and there was oil all around the underside and some on the top side of the head gasket. Pistons rings looked like new and piston wall was smooth as well. Installing the plug after I type this. But With that being said, what's with the oil under the head gasket? Could that be part of the overheating and low compression problem? Quote Link to comment Share on other sites More sharing options...
02Bansheeee Posted August 15, 2014 Author Report Share Posted August 15, 2014 & when it was assembled, we followed every step in the clymers manual. Except for the plug part. Quote Link to comment Share on other sites More sharing options...
bigweav81 Posted August 15, 2014 Report Share Posted August 15, 2014 maybe blown head gasket from overheating, just because your cylinder walls seem smooth doesn't mean they aren't worn. you should leakdown test to make sure you don't have an air leak, check your jetting, or throw it back together and burn it down and rebuild it right. Quote Link to comment Share on other sites More sharing options...
02Bansheeee Posted August 15, 2014 Author Report Share Posted August 15, 2014 Yeah, I checked the jetting. But the guy who had it before my brother must've bought off brand jets, cause I don't see shit on them. No numbers that I could see. I'll check again with a magnifying glass. & I always do a leak- down. Quote Link to comment Share on other sites More sharing options...
bigweav81 Posted August 15, 2014 Report Share Posted August 15, 2014 you need to list all your mods. make sure you check your water pump. Quote Link to comment Share on other sites More sharing options...
02Bansheeee Posted August 15, 2014 Author Report Share Posted August 15, 2014 98 Shee 66.5 pistons and rings Oem crank Vito's big bore gasket kit FMF sst I think boyseen reeds Stock carbs Ngk br8es Airbox w/O lid with k&n filter 32:1 yamalube Stock intakes with white brothers boost bottle Stock waterpump & bolt number 13 was broken off in case Oem stator and radiator 660 elevation Average temps: 70-95°f That's all I can think of. 1 Quote Link to comment Share on other sites More sharing options...
02Bansheeee Posted August 15, 2014 Author Report Share Posted August 15, 2014 On the water pump, what do I need to check for? The plastic gear? What about the impeller, do I take it out to check it? Quote Link to comment Share on other sites More sharing options...
bigweav81 Posted August 15, 2014 Report Share Posted August 15, 2014 if I was checking mine I would, broken case bolt? boost bottle? sure you don't have an air leak, you said you always leak down test right? pilot jet maybe around 27.5 to 30 main jet should be around 280 to 300. take your boost bottle, and throw it at your neighbors dog. Quote Link to comment Share on other sites More sharing options...
02Bansheeee Posted August 15, 2014 Author Report Share Posted August 15, 2014 Yeah... Lucky number I guess. & yeah I'm sure, his held 6lbs for 6 minutes last time I checked, which was around April or so. We hadn't really rode them so wasn't much of a need to test it since then. & thanks. Did you tell me those as being the fat ones to start with. Or that should be the sweet spot, either way I'm starting with 300. Quote Link to comment Share on other sites More sharing options...
bigweav81 Posted August 15, 2014 Report Share Posted August 15, 2014 as in it should be close to them, up to you to find the sweet spot. one good ride is all it takes for a boost bottle to crack a intake boot, look at them closely for cracks. Quote Link to comment Share on other sites More sharing options...
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