Thread: 1981 Yamaha xj750 Seca

Found this bike in Selma its an 81 Seca 750 inline 4 with Hitachi constant velocity carb's and shaft drive.

The kid i bought it from got it as a gift from his uncle he rode it around for awhile until the bike developed a carb issue. He then tried to "rebuild" the carbs and couldnt get the bike to hold an idle after that.

I came to his pad and looked at the bike it had 37k miles and looked to be in rough shape none of the carbs were getting fuel but the bike would start and run on starter fluid. I offered him $400 and he took it!

Brought the bike back home and took the carb rack off and instantly found problems 5 carb hat screw were backed out and finger loose,3 carb bowl screws were missing completely and none of the floats were even adjusted. Went ahead and fully dissasembled the carbs on the rack of course and cleaned up the pilot curcuit main jets and slides and starter assist circuit. Set the floats which is a bitch and put everything back on the bike.

Bike fired right up instantly ran good no knocking or anything! Went head and bought a new battery,petcock,plugs,air filter,front brake pads,yamalube motor oil and filter and shaft drive oil and rear turn lights.

Spent about $900 so far and have ridden the bike to porterville and back a few times it runs great but doesnt have the powerband that my 82 suzuki GS750E had but i do like the shaft drive alot more than chain!

Yamaha XJ 750 Seca
76 hp @ 9000 rpm
6.2 kg-m @ 7000 rpm
5 Speed / shaft
Standing ¼ Mile
12.3 sec / 106.6 mp/h

Right on I ride a Yamaha too, they make nice bikes. Mines a Virago 535 it's kinda small but it's my first bike. I eventually want to get a bigger bike after I buy my wife a house she says I can have one LoL.

sweet you already ran a 12.3 1/4 mile time on that bike! post the vid that thing sounds fast

Originally Posted by Joe

Right on I ride a Yamaha too, they make nice bikes. Mines a Virago 535 it's kinda small but it's my first bike. I eventually want to get a bigger bike after I buy my wife a house she says I can have one LoL.

Yeah i really like the shaft drive and it gets really good gas mileage i might have it up for sale pretty soon.

Originally Posted by 71 Heartbreaker

sweet you already ran a 12.3 1/4 mile time on that bike! post the vid that thing sounds fast

Nope that is what the bike ran stock back in 81 i dont think it would hit a 12 anything right now but who knows im going to sure as hell try!

Damn man, that's a pretty legit bike!!! Real decent power for an "older" bike. Looks real manageable, and probably great on fuel too!

Upon closer inspection the carbs have definately not been rebuilt lol but ive got the pilot mixture set on 3 cylinders with the last cylinder running lean because that carb is leaking from the throttle shaft. Im going to order a rebuild kit for them i have an extra carb rack that i dipped in 2 gallons of carb cleaner im going to leave it in there for a few days then install all new parts into those clean carbs. I want to get a color tune plug and a carb syncronizer and i will be hualin!