engine

Hey guys, I currently have an 82’ XS650 with the ol’ no spark problem. Any who, i have an opportunity to pick up a 73’ TX650 with extra parts and was wondering if anyone knows if the engine parts would work with mine? I have read that the frames were modified after the 73 TX but didn’t see...

I recently got my bike running and i have since noticed another slight oil leak when i park it. I get a couple of drops on the ground as soon as i park it but not much after that. I need to replace the crush washers and want to cover as many of these possible causes as i can while i have the...

I'm looking for some feedback on top end engine hardware kits. I am rebuilding my '81 engine and the hardware is all pretty rusty/faded. It looks like the Hughs handbuilt is the most complete, but doesn't come with the rocker shaft end plugs like the MikesXS kit. I am always suspicious of eBay...

Anyone ever tried a DIY gravity fed soda blasting set up like the video below on our engine top end? Attached are a few pictures of my disassembled engine. Years of neglect and oil leaks from the PO have left the exterior pretty nasty. I'm wondering if this would be a useful cleaning setup and...

Do these products work? Thinking it may be helpful for the 700 outfit where heat soak is going to be a problem. Has anybody any experience with them? Here is a link to the local distributor and the eye watering prices. https://www.evolutionmotorsports.co.nz/evolution/tsd-boron-nitride

how many of you guys are doing port and polish on the xs650 is it worth the time to do it

I’ve had this bike for a minute now. I inherited it after a dude got it running for the first time since ‘91. I cleaned the carbs. First time I’d ever done that, figured out what jets were. It kept leaking gas everywhere. The floats were all messed up. I said screw it. I bought the keihin carbs...

Hi all, I'm gearing up to replace the cam chain guide on my '75 and I was hoping to get some input on my parts list. I'm trying to get it all done for $400 or less, here's what I've got (all from Mike's XS): Premium gasket and seal kit: 18-0001 Cam chain guide: 05-0006 Cam chain: 52-5021...

Hey, folks! Got a question... I'm in the process of fitting the engine back into the frame. I went with the approach of doing it with frame in the upright ( I know some do it with the engine and frame on the side). Got it in with a bit of a wiggle. The lower centre bolt went in without an issue...

Im re-torquing my engine head with the motor still in the frame and i cant get a damn wrench on bolt #11. Does anyone know a way to make this work? I wanted to torque it to spec with a torque wrench but im not so sure i can get an accurate reading on it given the location.

I learned two bad things today and i'm going to ask some (possibly) obvious question just to get your opinions The PO broke off a sump plate bolt. The on on the front edge on the right side. I could get it out but it would suck. I don't want to pull the engine and i don't have a drill i could...

looking for an xs650 motor to start a chop project with,would prefer one that has good compression and is ready to rock just needing some minor love,willing to drive if in georgia

This thread details the reassembly of the top end of my 1980SG. Everything's already cleaned up and measured, but I'll backtrack a little and show how to do some measurements. All manual references used here are from the 1978-80 Yamaha Service Manual. All points of view (left and right, fore...

Gentlemen, I am intending to ceramic coat the pistons for racing two stroke. I have used professional coaters before and been satisfied with the results. However the cost of doing 4 pistons top and sides is an eye watering NZ $231. I have found this source for DIY ceramic coating material do...

XS650 engines. I have to access 650 engines one was running one is locked up and I really never really dug into it… I was going to send them both off to Houston have him re-phase and just build me one good engine however he has seem to matter early retire so basically I’m looking to get rid of...

Gentlemen we have been having a lot of problems with the gear selector mechanism on our classic sidecar. The spring (first picture) has broken numerous times. We thought we had fixed this by fitting a heavier duty spring. We also have had problems with the actual selector mechanism breaking...

Looking for tips, spitballing a rebuild with new pistons. We can get 91 octane non-oxygenated/ethanol free gas is a lot of places, so I'm thinking about high compression for 91. I have a Hoos Racing Shell#1 cam, and a stock cam on the shelf. What sort of compression ratio should I be looking...

Howdy, I have an 83 XS650 that I am converting from a 6 plate clutch to a 7 plate clutch. I've got all the parts (I think) except for the earlier clutch hub. I'm looking for a 74-79 inner clutch hub - if you have one or know where I might find one please let me know. Much thanks, S

Here are the symptoms: idles fine, but when riding it does not feel powered. It runs but when above 3000RPM it just does not progress fast or almost at all. It slugs and it's slow... like it has little power and progresses too slow up the torque... The details: The carbs were cleaned...

Hey guys I'm new to the yamaha 650 scene and was wondering if I could get some pointers or help. I just recently picked up a 77 XS that has been hard tailed already. But that's it. It came with three incomplete engines and about 7 boxes of random and duplicate parts for it. I want to try and...