need help once again

Ahh, thank you. It may have never had a valve adjustment done and at that mileage it will need it. It will throw off any carb tuning you try to do. It's especially important on the 550s, honest.

 

I'd recheck the compression after doing the valves. I know the 650 spec is no more than 14 psi diff between cylinders. #1 looks pretty low even though it will run.

 

got a question on this. i found a rack of carbs from a 1982 seca with the factory plugs still over the mixture screws,and my scooter has got pod filters and free flow exhaust on it, if i install this rack of carbs(thourough cleaning before hand of course)do i have to adjust the mixture screws?and also if i change my main jets(#140) from the old carbs to the new carbs do i have to change the mixture? i know main jets only control top end but will this affect my idle/power output with factory jets(from the new carbs) having pod filters and free flow exhaust?

 

Q1: Yes. Q2: Yes. Q3: Yes. Even if you swapped that rack o'carbs from one completely stock 550 to another, they would need adjusting. Using a set of carbs from a stock motor with your setup will not only require rejetting but also re tuning. No way around it. But adjust your valves first.

+1 on getting yourself a spare rack o'carbs though. Nearly a necessity for serious XJ stewardship.

 

Cobra,

My Seca 550 developed the same syptoms you have (wouldn't idle without the choke applied). It's due to my throttle shaft seals (some call them butterfly shaft seals) leaking.

I'd suggest you start the bike and get it to where it's idling with the choke on. Then spray some carb cleaner around the shaft seals, if you're idle goes up, they leak.

Everyone else seems to be missing the point that it ran fine before you cleaned the carbs. Cleaning the carbs probably finished off the seals and they gave out due to age.

I think you just need to replace the throttle shaft seals and check your valve clearances.

 

i just got my new pilot screws(mixture screws) kit and i need to check my float drop with the bowls off, does anyone have a pic or spec for this?

 

ok the kit does not have the right parts in it, so does anyone know where i can get a set of JUST pilot mixture screws?(with springs and washer and o-rings?

 

chacal (PM info @ xj4ever.com) take the spaces around the "@" away. He has individual parts.