81 xj650 before i synch the carbs i got a problem

I just joined hey everyone.
okay i got an xj650j and it will start and idle for a little bit but then dies. two cylinders are not running as good as the other two im pretty sure its the carbs but is there a way i can synch them before my bike starts so it will idle? any ideas would be awsome

 

Did you just get this bike?

You'll need to clean the carbs, bench synch them and then get a running sync.

After you have checked the valve clearances.

Also be sure to check the brakes for delamination and age on the lines. Check the tires for age as well.

 

I got it three weeks ago

I got the carbs cleaned yesterday how do I go about bench synching them?

This is my first bike build

 

A strip of index card is slid under the throttle blade from the engine side of the carbs and the sync screws (3) between the carbs are turned until the card just drags out from under the throttle blade.


Also, if you add your location info to your profile there may be someone close by to lend a hand if you need it.

 

Ok I feel a little dumb the throttle blade is that the piece the the throttle cable pulls up

 

No. The throttle blade is the round disk inside the throat of the carbs that opens and closes with the throttle.

However, if you have not checked your valves all your tuning and adjustment will be for not.

These bikes will not run properly if you shortcut the process.

 

I got ya thank you

Do you think that's why those other two cylinders are weaker than the others and
What is the clearance for the valves if by chance u know off the top of your head

 

http://xjbikes.com/Forums/viewtopic/t=1 ... valve.html - valves how to with pictures

 

Thank u greatly appreciated

 

Hey, just a word of experience here (iwingameover had to ride up and bail me out) don't worry about the carbs until the valves are in spec first.

Also, you've probably seen this all over the site, but PLEASE, PLEASE, PLEASE - before you ride: check the date codes on the tires and front brake lines, pull the rear wheel and check the brake drum for delamination, check your petcock for leaks, check front brakes for operation, and change the oil + filter

PS the "throttle blades" are also referred to as "butterflies" often too

 

Thanks for the heads up jmilliken I got all that just still gotta do the valves and finish the front brake the cylinder in the caliper was all sezied up still workin on breakin it lose and cleanin it im really glad I found this site you all have been helpful and I have not even been a member a full 24 hours

 

Use a grease gun on the bleeder nipple to extricate the caliper piston. You will need a solid metric bolt to block off the union hole and some paper towels to clean out all the grease, but it should slide it right out of there for ya.

 

Or reattach your brake line, caliper off and pads out and use the master cylinder to push it out with brake fluid. Either way DO NOT put your fingers in the pistons path. When it comes loose it comes loose quick.

 

Got the front brake done new pads and all cleaned up iah used the master cylinder to the caliper very good tip