'93 Yamaha Seca II - Idles high?

Question

I recently bought my first bike and have noticed that after riding for about 15-20 minutes, when I come to a stop (stop sign) and have clutch lever pulled in (engaged) the bike idles 2,000 - 2,500 rpms and seems jumpy. If I ease out the clutch and let the bike roll about 6 inches, then re-engage the clutch the idle will drop down to about 1,000.

Assuming this isnt normal - but could this be carberators needing cleaned? or a tune up needed? I called my local Yamaha dealer and was told that they will not service this bike because it is over 10 yrs old....(great....not)

Only idles high like this when engine is warm (after 15-20 minutes riding) and when stopped with clutch engaged waiting to take off.

Answer 1

Could be an intake manifold air leak.
I've seen this problem when the carbs are out of sync.
Search for an independent shop (not authorized manufacture, or name brand).
They'll usually work on anything for the money. As brand name dealers attract the majority of work.

Answer 2

HUM, YOU MAY WANT TO LOOK FOR A DIFFERENT DEALER. but the problem you describe sounds like you control cables may be miss-routed, you can buy a Yamaha shop manual that will help you diagnose and repair the bike yourself but you can only get it from a Yamaha dealer. if you like the bike the price of the manual will pay for itself the first time you use it. anyway good luck;)another thing it may have a intake manifold leak.

Answer 3

nicely its perplexing to assert, you may attempt. the subject won't additionally be the mounting, some older carb's fixed by diameter and clamps vs bolts and flanges. the subject won't additionally be the throttle setup which you will could interest some mounts in, or choke cable and the hosing would be uncomplicated.. with all that pronounced, the subject may well be the tunning, it won't be jetted in a thank you to permit the motorbike to run proper. in the journey that your truly extreme on the subject of the motorbike, Ive observed a great number of on line places that sell components and rebuild kits, do it proper and positioned a great replaceable area on the motorbike and you will save your hair alot longer.