Maintenance & Technical > KX100 / KX85 / KX80 / KX65 / KX60

KX65 plug reading after full engine rebuild - with pics

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Mike-Evans:
Whats your thoughts on the plug colour. Just run a full engine rebuild in, 2 heat cycles on the stand (5mins idle then cool completely), 15 mins half throttle then warm up and into bands gently.... 125ml putoline to 5 lites fuel (40:1). Standard jetting.

Thinking of dropping the needle 1 position and maybe 1 richer in the main?

Also, should I run the 32:1 ratio per the service manual?

Foxx4Beaver:
it's hard to give an accurate answer with a pic, as the lighting/image is never the same, as it is actually having it in hand to see it for ourselves....but, judging by the pics, I'd say you're correct in going a little richer, as that plug does look a bit light/lean.

Mike-Evans:
It is very close to a light tan, but too be safe I will richen her up.

Question is, what circuit do I make richer? Needle or main?

Foxx4Beaver:
you might be alright just richening up the needle position one notch, unless it's ridden wide open the majority of the time, then you'll wanna go up one on the main too...you'll have to do a few plug chops/readings to determine what's best, because you might be able to get away with just richening up one circuit.

Mike-Evans:
Took  the lad out tonight, went 1 richer on the main ( now 200 ), this is the plug colour.





Why would the jetting now require adjustment after a rebuild? The bike picks up perfect from the throttle just being cracked open and crusing in third, then opening it up.....

On the way back to the van, the bike was hot after 30 mins riding, there was a lean bog straight off idle, got the fastest idle rpm about 1 1/2 turns put on the air screw. Lean bog was not there when we starting riding tonight??

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