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Posted by Troll
 - February 07, 2013, 13:52:08 PM

I have a 1500, and my spark plugs last over 50,000 miles.  If you are having an issue with the rear plug, only there are several possible causes. I saw it mentioned that the valve lash adjustment should be checked, as well as the compression...both good places to start. I believe the lash adjustment interval is 15,000 miles. Since there is only one carb feeding both cylinders, it seems unlikely that the carb would be at fault, but an intake leak could effect one cylinder. How many miles on this bike?

Posted by John Hopkins
 - February 07, 2013, 12:45:46 PM

I would not advise you to change or adjust anything until you have a better idea of the cause..Take a look on ebay for an engine compression tester..they don't cost very much..

Then disconnect the four plug caps and one plug from each cylinder, connect the compression tester to the front cylinder first..then turn the engine over for about five seconds..record the reading..150 psi would be nice..now test the rear cylinder..what you need is roughly the same compression in both cylinders, if the rear cylinder is a lot lower than the front I'm afraid you have a serious engine fault..if they are both the same you have an easy carburetta fault.

John.

Posted by Drift1
 - February 07, 2013, 05:13:29 AM

Ginmocny,let me be the first to tell ya,I'm by far any type of mc mechanic.Have you checked your valves or adjusted them at all?If you don't have the repair book (bible) as a lot of us refer to it as,you can also see this done on YouTube.Wish I could help you out further,but I'm positive someone on the forum would be able to help you out more.I'll try to find out more info for you as well,my man.

Posted by ginmocny
 - February 07, 2013, 04:36:26 AM

Hi everyone. It's a first time for me to write something on the forum, I feel like virgin :). I live in UK and I'm proud owner of Drifter 800 from 1999. Recently I'm having trouble with me bike. Every  7 - 10 days I need to replace spark plug in the rear cylinder :(. Burnt spark plugs are black and bit oily. I have checked oil level and is +/- this same level. Some times here is some smoke coming out from the exhaust. When the spark plug is on his last legs the engine start misfiring and you cant ride without choke. When engine is cold all working like should, soon it's get warmer there is strange knocking coming out from engine. I can feel it rather the hear it. When I accelerating this knocking is more feelable. No knocking when gearbox is in neutral. Any ideas where and what to check??? Regards

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