engine

Hello fellow XS650 enthusiasts, I am having an issue which I don't know what causes it. My 1981 xs650 vibrates like crazy. I have just finished another tune-up: adjusted cam chain tensioner, adjusted valves, tried adjusting timing with a newly bought strobe light and realized that my model...

My bike engine experience is pretty limited. I've worked on solid lifter BMW engines a million times and have a good sense for what valve train noise sounds like loose and tight. I'm in my final tuning phase on my XS and I've got my valve lash set at .004" on the intakes and .006" on the...

Hi guys. I am so lost! PMA installed, New coils, New plugs, new caps, new points and condenser. Cleaned carbs several times, also ilde screw hole. Cleaned the really filty petcocks, new gaskets in them. Also changed fuel filters. No air leaks. I re-checked point gap, and found out that the...

Hey guys, I want to ask if any of you more experienced engine people have some ideas of what might be wrong with my engine, and why does it tick so god damn loud. Here's the story. I decided to rebuild my engine, after finding out that my engine had low compression in the left cylinder...

Hello all! I have a basket case 82 xs650 that is missing quit a few things. This bike has a kick start and a starter on it. I want it to be kick start so would I need to install points? Thanks

I have got my bike torn down for a top end rebuild. I am ordering first over pistons and rings and was looking for a shop to bore my sleeves,clean up the head and check the seats on the valves. Does anyone have any experience with any shops in Alabama? Would just any machine shop be able to do...

hey guys, so i'm about to start rebuild of my motor= 79 f.. I took oil pump apart and all looks good but uncertain of reinstallation , is there a diagram showing breakdown of each part? i ask because when i took it apart i noticed a flat washer that must have stuck to a part that later fell off...

Hi All- first post, would appreciate input on the two items below. The site has been invaluable as I have disassembled and now prepared to reassemble my engine. Background: Purchased a 75-76 engine in a 1982 frame and ran it for a few months. Replaced really loud mufflers with Mikes XS...

Both drain plugs in bottom of 75 650B locked tight! Engine has not run in years but all inside storage and tight compression. Want to put the impact driver to them but afraid of cracking bottom housing plate. Suggestions? Advice?

Getting this '75 XS650 ready to ride, I took off the air filters. The boxes and screens are fine, but the foam inserts are pretty rotten. Looked on MikesXS, but I don't see just the foam inserts for sale, and the boxes are too expensive to replace for no reason. Can I just cut some furniture...

Okay so I have a 79 xs650 I built for 2 years I put a Hughes pma n regulator with a sparx capacitor. Now I can start the bike fine but give it a lil throttle n pops n shit now I redid my grounds n started testing things with multimeter I am getting up to 30 volts dc through the positive wire on...

The scoot has been sputtering horribly lately. I couldn't figure out why. I thoroughly cleaned the carbs, replaced spark plugs, cables, and caps, etc., etc., etc... When I would get about halfway back on the throttle... Sputter. When I hit a bump... Sputter. There are A LOT of bumps in Johnstown...

Some OW72 info A cycleworld article. feel free to post up any info you may have

I was noticing on my points that the block that rubs/rides the eccentric for the points isn't getting lubbed, because my felt isn't touching the eccentric. is it felt? what lube to use? I also noticed 3/4 of the rotation ,the rub isn't even touching the eccentric, but points open as they...

Hi! i have just finished rebuilding my engine from barrels upward and installed in frame, and was just making some final checks when i got suspicious about the timing, specifically the points opening and closing looked all wrong... upon closer investigation, it looks like the cam is 180degrees...

Hello! I'm new to the forum and xs650's in general, so i apologize for any stupid questions but i just purchased an original 5,000 mile '71 XS1-B with everything stock minus the paint (the original owner who i purchased it from repainted it in the 80's to a horrible black/rainbow flake color)...

My first ever engine rebuild saw me hanging on every word Nightflyer says on You Tube today as I tried to assemble my new top end. Is it better to fit new Pistons to barrels first and then fit sleeves to rods, or fit Pistons to rods and then slide barrels over the Pistons/rings? Two different...

First time poster. Still getting comfortable with my newly purchased 1980 XS650 Special II and took it out for it's first decent run...about 80 miles. Bike ran fairly well...it died a few times, but nothing crazy. My reason for this thread is...after running and parking it for about 24...

Certainly not a new topic, but I'm trying to appraise the condition of my pistons, piston rings, and cylinders. First, I want to replace my piston rings, but am unsure what size/dimensions I need. The local Yamaha dealer wasn't much help since their computer database archives nominal sizes...

hey guys and gals, I successfully tore down the motor and case. I'm about to start soda blasting it clean. Once done should I reassemble and then paint or paint before reassemble? :D:thumbsup: