2008 CRF250R - QS138v3 70H - ANT - Sanyo UR18650-RX 20s20p - Votol EM260

[bananu7]

It sounds like you have too soft rear spring with that 24mm static sag, do you know how much preload?
But the shock likely needs a rebuild too
I think I have changed springs 4 times, and it is still too soft..

I haven't measured the preload on the spring, just the sags. I agree that it likely needs a rebuild, because pretty much any issue in there will also manifest as it being too soft, like not enough pressure, not enough damping etc. I have another one ordered that should be coming to me soon, I'll see how it compares and will have a spare to give out for service so that I have something to ride on.

speaking of...


I still can't get over how nice it is to jump off of my commuter bike and onto this thing. I rotated the bars to the +2 position (to the front), let out a bit of pressure from the front tyre and added half a turn of preload in the rear. It's not exactly the most comfortable (as I'd prefer the bars neutral but mounted 2cm forward) but at least it turns now.

 

[bananu7]

Actually I have a sneaking suspicion the rear shock might have been lowered. That would explain surprisingly low feel, too slack head angle and my other issues. Stay tuned for updates once I receive the other shock.

 

[bananu7]

New shock should be here tomorrow, fingers crossed. In the meantime, I did some fitment tests and managed to get 15T in:



I think 16T could maybe barely fit with enough slack, but I might just wait for the chain to lengthen, lol. The new sprocket is a cheap variety, but with a decent fitment on the shaft. Not as good as JT or AFAM, but not as bad as what came with the motor. I was more surprised about the locking plate - the plate I used with the AFAM 14T was so thick that it wedged really solid in the shaft slot. That meant that when i tightened the sprocket, there was no play at all. This one is so thin that it freely fits in the slot, resulting in quite a lot of play.

I think it might be for the better, since this is how the sprocket I took off looked like:





Not horrible, but clearly showing signs of uneven wear. As far as I understand it, the play should allow the sprocket to self-center. I did put everything together and went for a quick spin, but it was raining and I wasn't going to test the WOT pull. It feels just as strong as before, maybe a tad more twitchy from standstill, and seemingly much quieter.

For the people not up to date, this gearing change means going down from quite absurd 10.07 to a more standard, but still quite short 9.40.

 

[gustavo88py]

You use the engine temperature sensor to connect the white wire.
You can see the engine temperature in the program

 

[Balgaroth]

What rear sprocket are you running ? I assume the ratio you gave are including the rear wheel ? Unless you have a 141t rear sprocket ?

 

[bananu7]

What rear sprocket are you running ? I assume the ratio you gave are including the rear wheel ? Unless you have a 141t rear sprocket ?

That's the final ratio including the 2.35 primary reduction inside of the motor I run 60T in the back.