wont rev over 2000 rpm - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 6 (permalink) Old 03-05-2012, 04:50 PM Thread Starter
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wont rev over 2000 rpm

So my bike has been sitting through the winter after having had carb issues before. I can start the bike up fine and it will idle fine, but once I tug on the throttle it starts to die. Especially once I approach 2000 rpm. I have pressure coming out of both exhaust but after letting it heat up a bit the front pipe does not put off the same amount of heat or combustion as the back pipe. It also seems like there may be a slight noise coming from the engine that wasn't present before. It is possible my timing chain self adjusting screws might have gone bad. This is the puzzle I have in my hands at the moment so I just need to have some opinions on what my issues may be and and the best order to approach these problems. Thanks for the input

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post #2 of 6 (permalink) Old 03-05-2012, 04:58 PM
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It sounds like your main jets could be blocked or gummed up, try running seafoam through the system to see if it clears any, if the bike is not running properly on both cylinders it may rattle a little and sound noisy
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post #3 of 6 (permalink) Old 03-05-2012, 05:03 PM Thread Starter
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Would it be ok for me to put half the seafoam in my tank and then part of it in the engine with the oil to clean that up a bit too? I have heard of people putting some in with their oil before but it was a little while back, didn't know if anyone had decided this was a bad idea or not.

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post #4 of 6 (permalink) Old 03-05-2012, 05:13 PM
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Quote:
Originally Posted by Zis44Zero View Post
So my bike has been sitting through the winter after having had carb issues before. I can start the bike up fine and it will idle fine, but once I tug on the throttle it starts to die. Especially once I approach 2000 rpm. I have pressure coming out of both exhaust but after letting it heat up a bit the front pipe does not put off the same amount of heat or combustion as the back pipe. It also seems like there may be a slight noise coming from the engine that wasn't present before. It is possible my timing chain self adjusting screws might have gone bad. This is the puzzle I have in my hands at the moment so I just need to have some opinions on what my issues may be and and the best order to approach these problems. Thanks for the input
I would first check the condition of the sparkplugs in the front cylinder ( are they old ? ) They should be light tan,white would be too lean, black too rich. I would then check to see if you're getting good spark thru the plug wire. If these check out ok you might have a clogged main jet in that carb. You are running off the pilot jets until about 2500 rpms, then the main jets kick in. I don't think the acct's are your problem now.

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post #5 of 6 (permalink) Old 03-05-2012, 06:23 PM
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Quote:
Originally Posted by Zis44Zero View Post
Would it be ok for me to put half the seafoam in my tank and then part of it in the engine with the oil to clean that up a bit too? I have heard of people putting some in with their oil before but it was a little while back, didn't know if anyone had decided this was a bad idea or not.
I haven't put any in the oil just in the tank but the guys on here say you can put it in there but just before you give it a oil change, although the can does say you can run it in the crankcase I don't think many have run it for too long
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post #6 of 6 (permalink) Old 03-06-2012, 12:39 PM
Crap, I WAS in 5th gear.
 
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IMO, modern oils have enough detergents that you shouldn't need to put additives in the oil, and you run the risk of breaking loose sludge deposits and clogging things like HLAs or bearing passages. However, if you do run seafoam in your oil, take it easy since you will effectively be running a much thinner viscosity oil.
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