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Hi Guys :waving:,

I am having a problem with an erratic idle on my 1500. The bike run's great and idles beautifully at 800 rpm or so but occasionally the idle becomes erratic and drops to 500 / 600rpm and might stay that way until driven 30 or so miles then revert back to it's perfect idle again. Just yesterday I drove 40 unplesant miles including city driving and when I pulled into the driveway she was her usual self, beautiful, smooth and begging to be given another drive. Rain eh!!!

Any thoughts? :?





I am also hearing popping in the exhaust!!
 

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A vacuum leak is the first thing I would look for. The 1500 has miles of vacuum hoses and joints that can perish and crack.
 

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Another little trick to try, is to turn the idle screw (knob next to the gas cap) back and forth a few times and then reset it. It has worked for others on here.
 

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Thanks for the replies guys.
Replaced all the vacumn hoses after the tranny job. Carbs were cleaned and floats set. Did the idle screw thingy already. Any other maybe'ssss.
 

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Try setting it to 875 mine was doing the up down on occasion till i bumped it up and now it will throttle up and when i let off it drops back slowly and stays there.
 

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Could be Vacuum Leak from the Rubber Boots, that connect the carbs to the engine manifold... these crack over time, and/or don't seal well.

I always put a smear of Air Filter Grease on mine, prior to re-installing the carbs.

Easiest thing to do offhand would be to get a long screwdriver and verify that the upper and lower Clamps, to each of the 2 boots, are tight.
 

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Bump up the idle speed a little.. also work the idle screw adjustment in and out a few turns.. that often relieves the problem (don't ask me why... it just does something worthwhile..)
 

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Seafoam stopped my popping or backfiring when i let off the throttle. One carb slide wasn't closing all the way.
 

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Sorry for the delay in getting back to all ya, weather etc etc. :lash:




I bumped up the idle to 900 minus a tad and the problem is solved. :applause:


Thanks again for all the input guys. :congrats:
 

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Hi, it might be a good idea to change the fuel filter and air filter,check the cc filter and sub filter as pm.
 

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Predator wrote:
What is 'air filter grease' ?
> It is a thick, waxy, non-lubricating grease that does not run under high heat... It merely provides an Air Seal between an air filter and the mating surfaces.


http://www.amazon.com/99-0704-Sealing-Grease-6oz/dp/B000BR51SI/ref=sr_1_cc_1?s=digital-text&ie=UTF8&qid=1318006800&sr=1-1-catcorr



I discovered the need for it with my first set of K&N filters on a GSXR750, by noticing that the filter "pods" did not seal adequatly against the intake manifold... which allowed Unfiltered air to bypass the filter media, into the carbs.
 
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