engine

Hey everybody! Rebuilding an XS650 motor this winter (I’ll post updates here as much as I can), here’s my tentative build list so far. Anything I’m missing?

Could anyone identify the bolts I need for the midsection here (below the spark plug)? I got a half disassembled motor and seems I’m missing this one bolt on either side

Hey all. I just inherited a 1973 xs650 and the lowest gasket needs replaced (Photo reference) but cannot for the life of me remove the top cylinder head. Seems prev owner used some really strong gasket sealant or something. Is there a way to skip removing the cylinder head cover? Or do I need to...

Question for the engine builders out their and those knowledgeable on evolution of the drivetrain on these bikes. Did the motor externally change from the early XS’ ‘70-73 to the ‘74 and later models? Specific ask is pertaining to the case covers on both sides of engine.

Building Sidecar Motor I started collecting parts for this motor a while ago and then got side tracked building the two-stroke outfit. This is not intended to be a how to build a motor it is more of a show and tell what I have done to build a race motor for a sidecar. Most of what is shown is...

So im building an XS650 engine, and was wondering if there was a website or list someone had to corelate a year range for parts specific to the engine. The crankcase is a 72 which I know is kicker only (EDIT: First year of electric), im just curious if I need to keep everything from the year...

Strenge sound in engine, no problemen with clutch or drivind, when the choke is off, the sound is almost goed. Some say its normal, some say its the clutch, but the clutch is New.

Hey all. First post on this forum. Hopefully it makes sense. Bike Info: Bike is a 1975. I rebuilt the entire engine myself. Running stock alternator with a Boyer electronic ignition. Kick start only with a lithium ion battery. Rebuilt the carbs, new fuel lines with inline filters, and rebuilt...

Just picked up an 1980 xs as a parts bike for a chopper build. Engine runs fine but I needed to remove it to prep the frame for a hard tail. When I was draining the engine oil there was this small spring magnetized to the drain plug. I haven’t done a whole lot of engine work on these bikes and...

I have been looking every where for a Complete oil seal kit for my 73' tx650 and I am in need of some help. I found this on ebay https://www.ebay.com/i/363178151307?ul_noapp=true let me know what you guys think, or would recommend.

Hello people of the XS nation, I need some assistance, I have been looking for a simplified wiring harness for what I believe is a 1980 xs650sg. The P.O. tore the stock harness to pieces and painted most of it. Trying to make heads or tails of the thing. Here the motor please let me know what...

Hey everyone stoked to get a donor engine to replace my current crappy engine that I don’t have time to fix. 1. 2F0-171615..... not sure which bike this is I wanted to say 1978 XS650SE but not sure. 2. does anyone have a simplified wire diagram for this bike?? It is completely stock engine...

This engine is in good shape, i bought it to put in my bike but soon realized it was way too big. asking 375 but am negotiable. the starter is already there for you! we can arrange pickup or have it shipped. you pay shipping.

Hey guys i'm looking for an engine to put in my 1970 xs bobber. I can have it shipped if need be and will by and or trade. Any help would be much appreciated. Thanks -Josh Fuqua

"Working From Home" has left me alone in a small room with my computer for more hours than I should be, and with a wife and kid running around the house.... let's just say looking at skinny girls is right out. So I dusted off a Windows98 virtual machine and an old copy of Dyno 2000 and started...

In another thread on this site XSJohn mentioned something that would lower cylinder temps by 20+ degrees. I am REALLY interested in finding out exactly what John was talking about here, so I did some digging. XSJohn's comments are in blue for clarity. This is a start, but there has to more...

Hello all, I have the guts from a 1975 447 motor but the case has unfortunately been tended to at some point by a chimpanzee. All four of the locating pins for the crank bearings on the upper case have been smashed in because the bearings weren't lined up properly when the halves were...

Hello all, I am new to the site and this is my first post. Please forgive any formatting errors. I recently purchased and tore down my very own 1975 XS650B and I have some questions regarding where to go from where I am at. I currently have the engine completely apart, and have a shop that can...

I have a low mile '78 that runs pretty good. The gaskets are original and a little leaky. I want to go through and replace with a kit. What would be the best resource for me to look at for this? Thanks

I recently made the purchase of a xs650 1980 Special II, and with it was included an extra seized engine for me to re-use parts or just use as decoration for my house. Since I plan to do major engine work to the main bike, I have been taking the engine apart as a means to familiarize myself...