So, recently I did an oil change and like a dumb*ss I forgot to tighten the bolt on the line at the bottom of the engine below the oil filter. I drain that one to get a little more dirty oil out, but in this case, I forgot to tighten it up so it was only snug fit in place and produced a pretty aggressive leak.
Unfortunately I found this after a 10 mi surface street ride to work in which I hit some high rpms. When I got home, I drained the oil and there was still a bunch in there that drained out, so thats good. If I had to guess, at least 1.25qts came out.
Thinking that all I need to do was change the oil again, I refilled it with 1.6l of new oil and verified the dip stick at the high mark after warming it up. In a stroke of sheer brilliance, I also adjusted the fuel screw a little like 1/4 of a turn as it backfired on decel after high RPM's few days ago.
The next day, I took it for a ride and it died on deceleration after running at higher rpms for a quick spurt. The kick start kick felt a little loose after this, so after some reading I decided to check the valve clearance. The cylinder compression seems ok because at TDC I can stand on the kick starter for about 30-45 seconds before it starts to slowly drop. (i weigh about 200lbs)
Also, if I press the decomp lever it didnt always decomp and it would be like kicking a rock every now and then, but not consistantly. Sometimes it works sometimes it doesnt. Seemed like i would have to kick further down than ussual on the decomp for it to allow me to kick it over to start.
Here are the original clearances:
Spec = .20-.25 So they were tight.
Spec = .10-.15, again all tight.
Left: 1.84/1.75 (1.84+.18-.25 = 1.77 rounded to 1.75)
Right: 1.84/1.8 (1.84+.20-.25 = 1.79 rounded to 1.8)
Equation: 1.86+.10-.15 = 1.81 rounded to 1.8
Intake: Left:1.86/1.80 (1.86+.10-.15 = 1.81 rounded to 1.80)
Middle: 1.88/1.85 (1.88+.10-.15 = 1.83 rounded to 1.85)
Right:.1.86/1.80 (1.86+.10-.15 =1.81 rounded to 1.80)
Clearances after changing the Shims:
Spec = .20-.25 So they are withing spec now.
Middle: .10 (.13 wouldnt fit but .10 would, so I'm thinking its ~.11 or .12) Still a little tight, but I didnt have the patience to take everything back apart and go back to the store for another shim)
Spec: .10-.15 So pretty good, but the middle is still slightly on the tight side.
Everything went back together with no issues.
Took it around the block for a ride and I'm still having the same issue dieing on decel after winding it out a little bit.
I've fiddled around with the fuel screw, and at idle I can blip the throttle all day with no issues, so I dont feel like that is the issue. Seems like it's running healthy, but then under load on decel it dies out. Kind of sputters and then when I grab the clutch it dies. Also, the issue with the decomp sporatically working persists.
So, what's next? Is it possible that a valve got stuck? Carborator gunked up due to the f'd up oil change? Something else due to the oil leak/ oil change mistake? MIddle intake shim is still too tight? Carb idle/fuel screw issue?
Should I take it to the stealership for a diagnosis?
Any suggestions or thoughts are appreciated.
Edited by Sj1, February 18, 2012 - 05:32 PM.