engine

I'm trying to run a very simple system on my 1983 XS650. No battery, just the Hugh's PMA, capacitor, Boyer ignition, and kick start only. Other than that i'm just running head light, tail/brake light and turn signals (and a fuse). I've wired those on a separate kill switch so they won't draw...

Hello, just wanted to say yes I am new to working on motorcycles and appreciate any and all info available. I have been working on the 1975 xs650 bored out to a 750. Here is my deal. I took off the clutch cover that was already on the bike. Once it was off I checked the gasket and internals...

the oil pump does not work? or oil will be high when the speed of the crankshaft when the engine is running? what am I doing wrong?

OK, this could 100% be just me being paranoid. I'm installing my PMA (TC Bros if it matter). The woodruff (who thought of this name by the way?) key is in the slot, i'm putting the rotor on (kind of like playing tetris by the way, getting the damn thing to fit without shooting out). I...

Ive been working on this project for a couple years and have flip flopped a lot and i think i have finally gotten to a point where i am ready for my final steps. i was just wondering if there is anything else i should do before i do paint and powder coat. what i have done. -Tc Bros Hard...

Just rebuilt the top end on my 81. It ran great and was completely reliable the 4 years I rode it before the rebuild. (one kick every time)Only rebuilt because the front cam chain guide was falling apart. I had the carbs tuned quite nicely, so I just left them the way they were when I put...

Anyone know where to get these and what they are for?

have a 1980 650 and needing to get pamco ignition and pma system. Wondering what is the best source to buy these, only one i know of is MikesXs heres what i would be purchasing/need https://www.mikesxs.net/parts/yamaha-xs650-complete-high-output-standard-ignition-xscharge-pma-package...

I was looking to make sure my cam chain tension was correct on my new to me 1978. I've removed and identified the tensioner as a type D, and the manual says that it should be turned until the push rod is flush. Well there is no way that can happen as with the rod pushed into the max it's...

Hi all, running into an issue with timing my 75 xs. I am currently trying to time the right cylinder points at the fire mark. i have the plugs out and valve covers off and am just rotating the motor counterclockwise with a wrench on the flywheel to see when the points spark..i believe this is...

I put my bike away for the winter with a bad case of carburettor flu. Gasoline was poring out of one of my carbs. Bike was running fine. Took the carbs of and checked and cleaned them. Replaced all hoses as well. I put the carbs back on the bike today and now it's blowing air out through the...

Ok. So I followed the advice from the board and re-torqued my head. It runs great but I have oil seeping/streaming from my base gasket. I may have screwed up when I took the head nuts off because I took the opportunity to replace the old rubber washers with brass washers and also to replace the...

All Bike has just come together, so I'm taking short shake down rides. Engine was a full rebuild and bored out to 750. BS34 carbs. Drag pipes. Kick only and running a capacitor. The bike is running well ( swapping out VM34s to BS34s made a major difference ) other than in the short runs...

Hi everyone, so I finally was able to get a hole of a bore gauge and micrometer to measure my cylinder/pistons. Cylinder is in spec and almost perfectly round. Pistons however, not so much. pistons are about 0.015" sloppy... So I'm going to replace the pistons and rings and get her back up...

Hey just picked up another xs650 was told all original except paint (96 Porsche purple) and clutch lever. Have the owners manual. Had plans on building another bobber. Do you guys think its better to just leave og. I do love the older stock bike looks so I wouldn't mind keeping it stock. If i...

Hi guys just finishing up putting my top end back together on my 75. I am checking the timing with a degree wheel just to make sure things are set right before putting engine back into frame. while at TDC there is a slight lag or dead spot in the piston travel although the intake valve is...

I finally got my clutch cable and ez clutch perch. I was putting my foot shifter on and I did not spread it apart with screwdriver and push in and wiggled it a bit and the shifter shaft pushed in too far. I had to drain oil and take off right side cover and clutch and put the shifter back under...

Hi, first post on here. Bought an 81 XS650 last year and have been reading for a while. Hoping someone can point me in the right direction with some engine trouble. I bought the bike with pod filters and straight pipes installed and the word of the previous owner that it had been jetted for...

Alright, do i need the full setup for $231.95? Seems like it but he has parts sold seperatly as well and its somewhat hard to tell. Tried getting ahold of them but never got a response. Dont want to drop the cash and get the wrong item. Thanks

First time former, I have a 1974 TX650A with 2500 miles which has not seen a spark in 30 years, I've read a pile of information on the bike and still learning. When cleaning the points and cam I noticed the cam has a keyway cut in it, but the 'cam rod' on the threading does not have a keyseat...