backfire

Again, I’m brand new to motorcycles. I’m finally at the place where I want to start the bike but I’m not able to. I have spark, decent compression and I’m feeding fuel directly through the fuel inlet on the left carb. As I pour fuel into a container that has a hose with the other end connected...

Hey Guys, I have a 1976 XS360 with a backfire that has been plaguing me for a while now. It is only on the left cylinder, here is a list of things I have done so far to try and fix the issue. Adjusted points and timing (static and dynamic) Replaced points (only left, I got a set and the...

Hello all, and may I thank you for supporting such a wonderful and helpful site. Two weeks ago I bought a 1978 XS400 (2LO VIN) for $50. It had been sitting for 3 years, but had run when it was parked in a shed, or so the PO said. I brought it home and me and a friend sprayed some starting...

Hey guys... Really need some help trying to sort out my '79 XS400. I've had some major issues along the way since day one with this machine and I'm close to calling it quites. If I don't soon my wife is going to force it!!! Background: I bought a 1979 Yamaha XS400 with 18000 kms on it. Has...

Hey, Changed my oil and adjusted valve clearances yesterday, now valves all within spec. Took a video before right cylinder intake valve was set properly. Didnt like the sound so went back over and checked all clearances. I just did a poor job on one of them (was .003 out! on an intake valve...

My fellow riders, I have gone through everything (carbs cleaned, float level set, valve clearances set, carbs synched, timing and points gap set, mixture screws 3 turns out) and overall my '81 SOHC bike works fine. BUT the left muffler still pops quite substantially. I have found two tiniest...

Hey guys I am waiting on a clutch push rod seal to fix a leak, and while waiting I decided to sync the carbs now that my pipes are all welded up. Well I bench sync'd, reinstalled and fired her up. She ran, but kinda rough. Tweaked the mixture a bit more and things were about normal that...