EN500 works only on one cylinder

[wally_m82a1]

Hello
Im owner of EN500A (first registration in 1997). Today i wanted to warm it up (winter is comming), and Ive noticed it works only on one cylinder.
Its third time since July when i have this problem. Change of spark plugs helped but problem is back. Today helped swap spark plug for previous one (btw. changed before because of the same issue). Its always the same cylinder.
I found some similar threads but i have trouble with understand "colloquial" words.
Thanks in advance.

[bikerbill]

What 'color' is the plug? Black & sooty means the mixture is 'rich' suggesting a problem with the carburetor or air filter. If it is severe enough it requires correction.

What spark plugs are you running? If they are DR9EA try going one range hotter with DR8EA. I had similar issues early in Hidalgo's life and since switching to the DR8EA have had no spark plug related issues.

[wally_m82a1]

Thank You for Your reply.
I have older version than You. Mine looks like that: Click.
So I have DR8ES plugs. Air filter was changed in July.
Plugs really looks black, soothy and... wet just after remove from cylinder.
So its looks like something with carbuteror?

[Blaine]

Sounds like your carbs are dirty.You might get away with a dose iof SeaFoam.It may save you taking the carbs apart.

[wally_m82a1]

SeaFoam is to expensive to order it to my country so its looks like I need to print Haynes and disassembly the carburetor.

[Blaine]

Originally Posted by wally_m82a1

SeaFoam is to expensive to order it to my country so its looks like I need to print Haynes and disassembly the carburetor.

Maybe there is a cheaper alternative you can use as "preventive maintenance" once the carbs are cleaned.Pay particular attention to the pilot jets as they tend to get plugged & cause your symptions.

[wally_m82a1]

Blaine that seafoam is a replacement for disassembly or it should be used after disassembly and cleaning?
I was looking for alternative but with no result for now.
Jets should be fine- one was plugged but when i gave bike to synchronize "carbs" mechanic cleaned it (with a wire because suppresed air and some other methods couldnt help). I dunno which jet it was but issue from thread occured before.

[sfair]

Plug mis-fire can cause sooty/wet conditions too.
Check for fat blue spark on the offending cylinder, in fact, both.

I recommend one of these because using any other method can put your ignitor at risk:

http://www.lislecorp.com/divisions/p...n=1&category=8

Any place that sells car parts should have it, or its equivalent. They are cheap.

Post back with your results.

[Blaine]

Originally Posted by wally_m82a1

Blaine that seafoam is a replacement for disassembly or it should be used after disassembly and cleaning?
I was looking for alternative but with no result for now.

It is used as preventive maintenance to keep carbs & combustion chambers/valves clean before there is a problem.I use it once a month or so to keep things clean & running properly.

[wally_m82a1]

Originally Posted by sfair

Plug mis-fire can cause sooty/wet conditions too.
Check for fat blue spark on the offending cylinder, in fact, both.
[...]
Post back with your results.

Sparks are fine. Further if I change plug for the previous one, engine starts fine.

Originally Posted by Blaine

It is used as preventive maintenance to keep carbs & combustion chambers/valves clean before there is a problem.I use it once a month or so to keep things clean & running properly.

Thanks. So first ill try to clean "carbs" and later i will look for something to prevent

Now when I know where should I start to look, I just need to find some time to do this - Job and studies take all my time for now. Thank You for Your sugesstions