Excellent write-up, Bryan!

 

Thanks Nobrakes! In my opinion, YOU are the king of write-ups. I've learned a ton from your posts. Your outstanding post on how to check valve clearanceand do re-shims was most helpful to me. Even tho you've gone orange, I hope you still stick around...

 

Might this mean that the KLX300R CDI might be a better "fit" for a KLX250S big bore (331cc)?

 

I would be inclined to agree with that. I think the added displacement on the 331 will more than offset any low-end torque issues.

 

Hah! Yep I'm quoting myself. I made this post prior to finding out the KLX300 had an AC CDI! Give me an idiot award for the speculative posts in this thread...JEEZE!

Also, the KLX250SR CDI is no longer available off the shelf. It has been replaced by the KLX250ES CDI, PN 21119-1533, which has a less agressive advance, but is much better than the one on the KLX250S. I'm running with the -1533 right now, but if I could find an SR CDI, I would go with that in a heart beat.

You can only find the SR CDI at auctions now and they sell quickly because they are becoming very rare. You're lucky to have found that one, Nav.

 

Tremor,

Where does the -1399 curve take place? It is listed as being from a 250SR, not sure the year. Was able to pick it up along with the factory harness. Going to compare to mine and see if it would be easier to just swap the harness rather than splice the wires. Wondering about the timing curve though, and I know your local bike shop has the info.

 

Some changes to 'booboos' in the original response are below in asterisks

**The curve is 'somewhat' similar to the KLX300R... 5degBTDC@1700RPM and 40degBTDC@5000. The KLX300R CDI curve is a little steeper. It advances to 40degBTDC by about 3500RPM.** The 250SR CDI is slower to advance in order to facilitate better low end torque with the smaller displacement...MABT (Minimum Advance for best torque)..**

As for the exact shape of the curve I couldn't tell you. Once you get it installed, fire it up, get an advance timing light and some graph paper, then plot us a curve...you could be a pioneer

 

looks right to me. as fars as no rev-limiter, ive one hit it twice (on purpose of course).

 

Bump for corrections to last response.

 

hello are you can put a klx 300 cdi my klx 250s 2006 . I do not think the cdi spark does not work