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Post by Owen Nevins on May 30, 2011 23:25:57 GMT -4
My primary bike right now is an 86 xj700x. It runs great but after about 10 seconds at idle is dies slowly. I removed the carbs and checked the bowls and floats found the be really clean. Reassembled and found same problem. I am a tech at a local car dealer and and know cars well but never had much experience on carbs. So after reading alot about carbs it sound like my problem is comming from the primary jets which control the idle speed and low trottle range. I removed all 4 abdjustment screws and found a torn seal on the needle valve on the base of the screw bore. I have ordered a new set of seals. Hopefully that will work anyone have any similar problems or ideas?
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Post by tango911 on May 31, 2011 11:06:24 GMT -4
mainly just pull the carbs a part clean and blow out every hole you can find  make sure your floats are set at proper height. Make sure your float valves are not sticking. Make sure your plugs are all good and your caps might have resistors? Had a prob with one cyclinder last year, the plug kept going bad, it was because my plug caps resistor was bad. Got new plugs caps and it fixed my prob. |
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gr1976
Learners Permit
Posts: 351
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Post by gr1976 on Jun 16, 2011 21:55:40 GMT -4
did you get it fixed? if so what was the problem?
if not did you balance them?
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Post by williamc89 on Jun 26, 2011 21:15:09 GMT -4
i have a 80 xj650 and im have same problem. but i have had to replace intake runners and now it runs but doesnt want to idle in less on coke,
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gr1976
Learners Permit
Posts: 351
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Post by gr1976 on Jun 26, 2011 21:29:05 GMT -4
did you check for a vacuum leak around your new runners? if it's only running choked it might be pulling in air around the runners.
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Post by williamc89 on Jun 26, 2011 23:05:34 GMT -4
mine will run off coke if i adjust the idle up , i think i have a issue with my throtle cable cause if you play with it , it idles up to 5,000 then hit it and it goes back down
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Post by leadkrm on Jun 26, 2011 23:08:53 GMT -4
Hey will if u dont live too far I'll come look at ur bike and see what I think about the idle issue ur speaking of
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Post by Owen Nevins on Jun 29, 2011 14:36:43 GMT -4
I never totally fixed it, thanks for all the help tho. I did check the caps, they were all out of spec. Replaced, noticed it ran better and started easier. But still rough idle and would die. Cleaned the carbs again and made sure my pilot circuits were spotless, no change. Checked timing, valve clearances, compression, and attempted to sync but would not idle steadily enough for that. During one such attempt a coolant line burst and sprayed my legs with hot coolant!! Minor 1st degree burns. Now the bike is back from where it began... Craigslist!
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Post by williamc89 on Jun 29, 2011 19:48:12 GMT -4
mine is going to end up there i think
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Post by cb500bobber on Jun 29, 2011 21:10:53 GMT -4
Have u set your float levels
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Post by cb500bobber on Jun 29, 2011 21:22:40 GMT -4
Okay a couple things I found have you guys adjusted the valves they say that can cause idle issues. Also the say blocking 25% of the vacuum intake port over the gas/ air main bore can make them run a little bit better.
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Post by leadkrm on Jun 29, 2011 21:28:12 GMT -4
another odd thing to consider is airfilters. i had my airfilter in backwards and my bike was running very poorly and rich. turned it around and it ran alot better but i do have some gas leaks in my carbs due to the fact i reused the gaskets that were pretty streatched and worn out my air/gas mix set screws are also almost all the way backed out as well so when i set them in it should stop running sooo rich and run better.
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Post by cb500bobber on Jun 29, 2011 21:28:31 GMT -4
I also found they say if you have the YICS garbs that with age the have a problem the idle getting uneven and delivery lymph.
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Post by williamc89 on Jun 29, 2011 21:35:18 GMT -4
mine is a plane xj 650 1980,, i have had the carbs cleaned and i have check compression i have 120 lb psi on all 4 , i have the set screw at 1 and a half out. i have notice gas comeing out of those screws ,, i just dont knw youll see it friday night and what it does ,, i just dont have money to take it to shop and i dont want to throw a lot more in to this i have 750 in now. i am trying to get some different carbs
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Post by Owen Nevins on Jun 29, 2011 21:57:49 GMT -4
I checked my float levels and they were even all the way across but could not find a spec. From what rob told me at recycle part 2 is that my xj the maxim x is rare and has what is called a " genesis" motor which has no yics and 5 valves per cylinder, I guess it's special... But that doesn't matter much if it doesn't run right.
I don't know about fuel spilling out your pilot adjustment screws, mine had o- rings at the base of them maybe they could be missing?
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make sure your floats are set at proper height. Make sure your float valves are not sticking. Make sure your plugs are all good and your caps might have resistors? Had a prob with one cyclinder last year, the plug kept going bad, it was because my plug caps resistor was bad. Got new plugs caps and it fixed my prob.
