3andit
XS650 Enthusiast
Hey everyone,
I just picked up a '75 650 for my first motorcycle project (done trucks n jeeps in the past)
So I get the bike home and I already knew the electric start didn't work no issue easy fix if I even end up fixing it! The bike starts first kick every time idles smooth, but upon revving it up it smoked blue, like fills my garage with blue smoke like a two stroke lol so at first I thought ah maybe I'll get the old girl out on the road take it for a good ride and see if it's just from it sitting for too long. I rode the bike twice now got it all warm used different rpm ranges etc and it still smokes like crazy. So first things first I pulled apart the carbs. The carbs were spotless looked good operate great so awesome. While the carbs were off I took my flashlight and looked into the engine just because I'm curious and I noticed it's very black with huge carbon build up like cacked on everywhere! Weird thing is the bike seems to run really well. Right after running the bike up and down the road a few times I pulled the plugs and they were caked in carbon and wet n oily. At that time I completed a compression test and both cylinders are at 120psi not great but not at all bad. So I was thinking well better take the engine out and rebuild! But before I get too far ahead of myself I figured I'd ask your opinions.
So after that long read what all do you guys think ?
Oh and when I pulled the exhaust off it had a thick layer of carbon build up
Thanks in advance everyone !
I just picked up a '75 650 for my first motorcycle project (done trucks n jeeps in the past)
So I get the bike home and I already knew the electric start didn't work no issue easy fix if I even end up fixing it! The bike starts first kick every time idles smooth, but upon revving it up it smoked blue, like fills my garage with blue smoke like a two stroke lol so at first I thought ah maybe I'll get the old girl out on the road take it for a good ride and see if it's just from it sitting for too long. I rode the bike twice now got it all warm used different rpm ranges etc and it still smokes like crazy. So first things first I pulled apart the carbs. The carbs were spotless looked good operate great so awesome. While the carbs were off I took my flashlight and looked into the engine just because I'm curious and I noticed it's very black with huge carbon build up like cacked on everywhere! Weird thing is the bike seems to run really well. Right after running the bike up and down the road a few times I pulled the plugs and they were caked in carbon and wet n oily. At that time I completed a compression test and both cylinders are at 120psi not great but not at all bad. So I was thinking well better take the engine out and rebuild! But before I get too far ahead of myself I figured I'd ask your opinions.
So after that long read what all do you guys think ?
Oh and when I pulled the exhaust off it had a thick layer of carbon build up
Thanks in advance everyone !
