Maintenance & Technical > KX500 Original

Glamis- KX5 vs the four stroke questions

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delusionised:
About jetting....and gearing....going in october to Glamis with a crowd of 450's. Last time I rode with a 172 main at 32:1 with fmf fatty and vforce reed cage. when we raced up olds.. I won some and lost some, These guys are much lighter than I (65lbs or so) and I now lost 32lbs on the atkins diet and Im down from 248 to 216 in 9 weeks. Crazy! but anyway my questions are- I want to run stock jetting at 28:1 all my other 2-stroke buddies run that and do pretty well, I was playing it safe last time and I think I lost some performance running rich. Also do you think if I raised one tooth on the front sproket would I be better off when Im pinned in 4th up olds hill? May be pulling a litte faster? Im also going to run a FMF Gnarly Desert this time. So what do you think, If i lose 32lbs, run 28:1 with stock jetting on v-force reeds and raise the front one tooth, will it be safe for the bike and get maximum performace to pull some mega bike legnths on these four strokes? :twisted:  Thanks for any Input.

Arigato:
First of all, why would you run 28:1?  According to my engine builder and several articles I've read,  40:1 will net you the most power while still giving excellent lubricicity provided you're running good oil. 14-49 or 14-50 gearing will compliment your weight loss well.

hoopty:
I run Amsoil Pro @ 80:1 in LL100 avgas when I go to Glamis. I've had no problems at all and I've yet to meet the 450 that I can't take. I run 14/47 gearing and also have a VForce reed cage.

doordie:
delusionised,

With that mix you lean out mainjet very much,be carefully. :wink:

It?s about how fast air travel through engine:
small bore(125cc), high rpm(10.000 and above),high airspeed,less time to attached to cylinderwall,need more oil.
3%-4%

Big bore (500cc), more air, but low speed,low rpm(up to 8000),need less oil.
2,5%-3%

//doordie

delusionised:

--- Quote from: Arigato ---First of all, why would you run 28:1?  According to my engine builder and several articles I've read,  40:1 will net you the most power while still giving excellent lubricicity provided you're running good oil. 14-49 or 14-50 gearing will compliment your weight loss well.
--- End quote ---


I was always told to run a little heavy because of the extra load on the motor.

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