@XJ550H this bike wasnt/isnt being built to pursue the fastest run. Its bracket racing, consistency over speed. My goal as originally stated is...
Let me correct my information as I was looking at the 900 camshafts on ebay noticed this. The 750 head has 3 camshaft journals per camshaft not 4...
Alright gents, i have to set a deadline just to keep stuff pushing for the bike. If no one comes forward with the answers the the original...
Yea that's why I don't have much faith in finding a 891 here. I'm sure it can be done, but a bit rare I'm sure
Xj550 I love going back and forth with you but can we keep posts related to the questions asked please. I started a new thread so the information...
Just try to keep in mind that this is a drag race engine guys, even if the xj's werent really drag/supersport bikes
@xj550 Went over to the machine shop and confirmed this morning. 5g2 is on the jugs and head. Confirmed the size of the valves as well as being...
I did use your link and posted my findings in the drag thread yesterday i believe. Why an actual 900 when i already have the displacement of a...
If you read my message second to last, it says the code reads a 81 750 seca. I did use your link :)
So I figured id make a new thread instead of cluttering up the drag bike. So can you make a 750 a 900? The engine is already torn apart so i...
Forget everything i said in this. I must have read the gauge wrong. I miked the base circle and then measured the lift. Looks like the intake life...
Thanks dude, yea she's an interesting one. It's kind of fun decoding the whole thing. Wish there was more info on parts identification, but hey, I...
May be a bit of an old thread. I have a 81 Xj750 drag bike, but no street cruiser besides my buell. Im down in the Auburn area Thomas
What ive found out so far The engine code reads as a 81 750. First could digits is 5G2 which points to the 5G200 of the 750 Bore & Stroke of a...
I'll have to do that, seems like I'll need to get a new transmission anyways as the spare is for a 750 and I read that the 900 trans is stronger....
@Minimulty, let me apologise. I need to take any information I get from what's seen and verify it, because at this point nothing has been what...
Update Combustion Chamber is 24cc, does anyone know what stock is? Ill be calculating the dome of the piston within the week if i have time and...
No sir, thats the way they go. They are shaped so they cant go the other way. The engine is a 750 :) Thomas
So im going to assume that this is a high compression engine due to the piston having a lot more dome than i have yet to see in a photo of another...
Here is a close up of one of the pistons, definitely yamaha as it says it inside the piston [IMG] [IMG] [IMG] [IMG] [IMG] [IMG] [IMG] [IMG] [IMG]
Alright, so here is an update. I decided to break her down a bit. Here was the problem with second gear. [IMG] [IMG] I have a new transmission...
@Minimutly the collector of a 4 into 1 is pretty tall under the bike, thats what it had. At full throttle pretty much all the time, im not too...
Image Below Alright gents, i wouldnt normally ask something as simple as a fitment question, but as this bike is very different than your...
Can't seem to find a number on the cam. I measured .480 lift on the exhaust, having a hard time to get my magnet based dial indicator to stay...
Haha maybe. Dropping the clutch with a wheelie bar is quite the ride
Interesting. Thanks for your input. The guy raced it in heavy into the 2000s. Last sticker was a 2013. The gentleman couldn't hang on anymore...
I know what she runs on, it currently has 119 octane in it. He was running 116 in it but 119 was available for me. She ran in the ET motorcycle...
I forgot to mention, I bought this motorcycle and trailer for 500$ :p it's not pretty, it looks better now, but of course like I said, back up...
So I acquired this 81 Seca a coupple weeks ago as a back up for my Buell 1125r. Its quite modified compared to anything Ive read about on here so...
