Kawasaki Motorcycle Forums - View Single Post - 89 Bayou 300 backfires & coughs above idle speed

phillbus · 08-19-2008

I have a very similar problem with my 86 bayou 300. Runs fine at idle but when you give it gas it sputters and backfires through the carb, and makes a ton of blue smoke (burning oil??) and stalls. At idle everything's fine.

I took off the intake valve cover and the intake valve didn't seem to be seating right. When it was closed you could push it open slightly. I took the head off and sent it to a machine shop, they said it needed an intake valve and valve seals. I had both valve seals and the intake valve replaced (spent about $65)

So I got the head back today, and now I'm trying to time it... I thought there would be timing marks on the crank and the cam sprockets to match up but I'm not seeing anything on the crank.

I don't want to just wing it and ruin my new intake valve.

I was reading on here and seen it can be off 180* can someone explain that a little more? When the piston is at TDC that just means at the top most position right? Then at TDC where should the cam be? Whats the timing mark on the cam sprocket? There's 2 little lines on the sproket 180* apart, are these it? or is it the key on the camshaft?

08-19-2008	#12 (permalink)
phillbus Newbie Join Date: Aug 2008 Posts: 1	I have a very similar problem with my 86 bayou 300. Runs fine at idle but when you give it gas it sputters and backfires through the carb, and makes a ton of blue smoke (burning oil??) and stalls. At idle everything's fine. I took off the intake valve cover and the intake valve didn't seem to be seating right. When it was closed you could push it open slightly. I took the head off and sent it to a machine shop, they said it needed an intake valve and valve seals. I had both valve seals and the intake valve replaced (spent about $65) So I got the head back today, and now I'm trying to time it... I thought there would be timing marks on the crank and the cam sprockets to match up but I'm not seeing anything on the crank. I don't want to just wing it and ruin my new intake valve. I was reading on here and seen it can be off 180* can someone explain that a little more? When the piston is at TDC that just means at the top most position right? Then at TDC where should the cam be? Whats the timing mark on the cam sprocket? There's 2 little lines on the sproket 180* apart, are these it? or is it the key on the camshaft?