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XT600 cutting out at high RPM & load update...

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I had posted a week or 2 ago on my '89 XT600 that was starting & idling perfect, but cutting out/hesitating & losing power over 45mph with a load (riding). I acted on the tips from Motu and AHRMA17L, both did help! The linkage from main to secondary carbs was very off, and also the float level wasn't up to what the book showed. I corrected both, and this got rid of one symptom but I still had hesitation & banging at high speed & load. (now has power at all speeds when it didn't before!!!). It looks to me like the past owner screwed with it, not knowing how to diagnose it, and compounded the problem which I corrected thanks to you both.

ANYhow; I further troubleshot the bike and found that the CDI pickup coil shows open-circuit from the neutral wire to one end. This coil is a black box with 2 small magnets that sits next to the stator in the mag cover. This now makes sense because this would cause the timing to be all off at high RPMs and load! The coil, according to the book, should read 110 ohms across both fields. One reads 780 ohms and the other 110. That is if my book is accurate. I drove my turbo-Diesel Toyota truck around town with the valve clearance BADLY misadjusted thanks to a misprint in the factory manual, so I would like to confirm whether those resistance specs (110 ohms) are correct if anyone here can verify. So now I am on eBay looking for a used good coil, as I have the feeling I won't like the price for a new one at the dealer, LOL...

Comments welcome & appreciated.

Thanks, Charles

Los Angeles

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My book gives 3.4 to 4.6 ohms primary...thats across both terminals and 10.4 to 15.6K ohms for secondary...thats from neg to HT lead.It's a pity someone has already had a go at it,you will have to go over everything just in case they have been tampering.

Did you check the diaphram on the secondary carb? I still reckon that's where your problem lies,it won't lift fully,especially at higher rpm and it will run rich.Also check the small fuel hose between carbs,they can get blocked or kinked.

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