engine

81 engine inna 76 frame. Which carbs ate better? I live in a humid swamp for what its worth at sea level

I've rebuilt my carbs (bs38's), gone through all ranges of jets from stock to lowest andI'm 95% sure my rich problem is coming from the damn oring that goes around the emulsion tube. I've ordered the viton mccar master orings everyone suggests, when I went to put them on and put the tube in it...

Can anyone tell me what the large bolt is for near the neutral switch on the crankcase and where I could get a replacement. Cheers. Simon

Hi there folks. Thanks in advance for hearing this one out. I've got a 1979 xs650 that I bought a few years ago. Since day one, the right hand cylinder has given me varying degrees of problems. But I'll describe the current one. As it stands, the bike is a one-two kick startup but at first...

OK been looking at getting rid of the oil tube for something better plus I need a second source to feed a turbo. Now I have been looking at some braded lines and there are many tee's and Vee's that are used on race cars. So heres the question anyone ever tried this. Plus anyone know off the top...

Hey guys, Finished my build and it's all about the tweaking now. One of the things that is kinda bugging me is that when the bike has stood for a bit (1 night) it usually takes 3 goes on the electric start to get it started. Once started she's fine. The carbs have been cleaned, new main jets...

Wisely or not I just got in a bunch of piston sets from cruzinimage. I want to have my local engine guy bore a bunch of cylinders to match. Nothing is simple, looking for some opinions experiences on cylinder boring. He has bored three sets already for pistons I bought last year and one set...

I just bought a large lot of parts from an estate sale and am slowly sorting through everything. I was told the owner passed several years ago, had a full fab shop in the back of his house, and apparently flat tracked Yamaha 650/500s, worked on Ferraris, and gun smithed; there was some pretty...

Hi I need to replace con rods and pistons in my 533 engine. I have new pistons and rods for a 447 engine available, will the 447 rods fit my 533 crank shaft? Thanks /Mattias

Here is a project to regrind 4 valve adjusters and 2 clutch adjuster screws. This project uses the grinding fixture in the Valvetrain Geometry thread: http://www.xs650.com/forum/showthread.php?t=40042 The valve adjusters are reground to a radius of 19mm. The clutch pushrod adjuster...

Looking got anyone in south jersey to help me .. 1980 xs650

hi all we were putting my sidecar rig xs650 motor back together and noticed the adjusters dont sit exactly central on the valves, we know they have slight forward/reverse movement but they look offset to one side, we looked at anothe head and its not quite as extreme but still noticable, i have...

Hey guys, So I've got a 1978 XS650 that Im currently bringing back to life and it's giving me some issues. Issue: -Right exhaust gets really hot and pressure coming out feels somewhat low, not blowing my hand if I hold it loose -Left exhaust is completely cold to where I can touch it...

Hi everyone, Beginning my top end assembly today. The new rings I got from Cruzinimage do not have a mark on the top ring. The second ring has a mark, but nothing on the top. The old top ring has a very clear "RN". Anybody have any ideas on how to tell which way is correct? Does it...

Just looking for some tips on head work, carbs, an what not. Looking to get as much as I can outta the motor. It will only be running for short periods of time. I got a pair of 38mm kehin flat slide pj series carbs....

I can't find anything about this. Two times already dealing with an early model bike 70-71 the new Auto Advance Retainer Nut from Mikes (70-84) doesn't screw on easy. It's like it has a different thread size. The last one I just used the old nut. I don't have an old one for my current build and...

My electric starter sounded much like the bike in YouTube video link below (thanks, JohnnyAction). Mine did not chatter quite as long nor as often as the video. https://www.youtube.com/watch?v=5MdD2goE84o I did a lot of research here on XS650 Forum and did the following: I drained the...

I'll be as brief and informative as I can about this because I'm still frustrated as hell. lol This is my first real motorcycle and after three months of restoration I've finally got it started and running. A few days ago I attempted to ride it, or at least fiddle with it in the neighborhood...

I am putting a Pamco on my 1980 which had TCI ignition. I bought the inner bushings and labyrinth seals to put in my camshaft. They just slip in , with no resistance whatsoever. Do they need to be loctited in ?? , or is something wrong with them ??

Ok. I won't be able to work on my bikes for at least a couple weeks, so I'm hoping to get straightened out as to exactly what I have. I have a freshly rebuilt engine marked 4N9, a parts engine marked 2F0, and two non runners that that haven't even looked at that are marked 447. From the...