yfz 450
#1
yfz 450
I just got it used it has a 13.1 jd piston just reringed and sleave pressed timing chain advanced 1 tooth (exhaust I think) at idle it seams to knock at first I thought it was a fuel knock so I put it up to 104 octane runs great but still knocks at idle. I thought the crank could be going though I can't realy pin point where its coming from I also have some gas in my oil but i figured that was from running 93. if its gonna pop so be it i have a 471 stroker kit for it. is it safe to ride 12-15 mile trips any thoughts thanks.
#2
First, the Yamaha 450 tends to have a lot of engine noise compared to others. Before you get to crazy, is there a good running example you could compare it to(could be a dirtbike too?) Otherwise, I would probably have replaced the piston vs re-ring. The whole top end wears out quickly on these.
Gas in the oil has nothing to do with octane, but you may have a float issue, or maybe the piston is out of spec. Somehow gas is likely getting past the carb and your piston/rings.
Gas in the oil has nothing to do with octane, but you may have a float issue, or maybe the piston is out of spec. Somehow gas is likely getting past the carb and your piston/rings.
#3
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#5
Just got a manual this thing looks fairly easy compaired to my old 700 sportsman. I'm gonna check the valves this week end and change the oil and filter if it is a lower bearing making the noize I would have a power loss shouldn't it? or if its coming apart is the filter a small enough micron to catch flakes? In the first post I said reringed it's suppose to have a new piston/rings and sleeve installed. it also doesn't seam to blow any smoke either.
Thanks
Matt
Thanks
Matt
#6
changed my oil today I guess we are tearing down its got a funny silver tint to it awfully shiny to I'm guessing flakes off of the rist pin or crank bearings have you ever split the lower case on one these (scooter86). I'm an engine mechanic but I'm used to ones without spark plugs.
just wondering what I'm getting into. I never split the lower case on anything I owned.
Thanks
Matt
just wondering what I'm getting into. I never split the lower case on anything I owned.
Thanks
Matt
#7