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Author Topic: Help with Pilot Jet and Idling LT250R  (Read 2344 times)

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Re: Help with Pilot Jet and Idling LT250R
« on: May 13, 2015, 11:34:21 pm »
1989 LT250R

Will not idle, does not run well at all in pilot circuit. Starts relatively easy. Runs OK once you get into the needle and the main.  Bone stock engine, freshly rebuilt top end and all seals.  DG Pipe. Stock Carb. Stock airbox, no lid. Stock jetting... 30 pilot & 240 main.

Tried these things first:
 - Cleaned Carb, went through everything, works as it should
 - Set float level to stock setting per manual
 - Went through stator, coil, & plug cap...spark is bright blue
 - Compression good 150 psi

Then tried changing pilot. Have tried 27.5, 30, 35, and 37.5 with no luck (seems to run like crap on pilot circuit with all of these).  Have done multiple plug chops on pilot circuit at 1/4 throttle. All show no carbon color on base ring of plug but it is very wet/oily so plug is hard to read.

Below is a link to an audio recording of it running.... at first at 1/4 throttle and then some acceleration. PLEASE HELP!

http://chirb.it/A35qMr


1/4 throttle is not pilot circuit.  1/4 throttle is needle jet and slide cutaway.  The pilot jet functions from closed throttle to full throttle but it's effects are minimal at 1/4 throttle opening.   Check your reed petals.  If your petals are ok your needle jet and or needle is probably worn out allowing too much fuel at 1/4 throttle

Plug chops at partial throttle are a waste of time and will not tell you anything especially when the engine is rich enough to miss-fire.  Your ears are telling you it is miss-firing and the plug will remain white for the 1st 10 minutes or so when it is running rich enough to miss-fire.  Tune it so that it runs good and forget about trying to read the plug!!!!!!!!

 

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