Hi all can any one shed light on this, my 08 rev 3 250.

Previous owner had it set up like thus

1. Ignition timing was fairly retarded by 5 degrees I'd guess

2. Needle jet is a JJJ not the JJH standard size.

3. Front sprocket is a 10 tooth

Found the time due to the bottom end going and having a rebuild.

I can only guess they wanted a very soft engine.

On second note my m8 has a 2001 modle which seems to have more grunt and power than mine on a speed test he pulls way and leaves a fair gap even if we get away the same time ect.

A 10 tooth sprocket does several things. It primarily helps those of us who are less skilled with the clutch. You can go slower with the clutch out so it requires less clutch work. If you do a series of very close obstacles requiring a burst of throttle, it is easier to keep your speed down. (think - log, log, log) If the throttle does get away from you, the bike runs out of rpm sooner so is less likely to squirt out from under you. A 9 is even better for these things but made it harder to get over larger obstacles so not desirable. It felt like it took away the bikes reach.

7 hours ago, mcman56 said:

A 10 tooth sprocket does several things. It primarily helps those of us who are less skilled with the clutch. You can go slower with the clutch out so it requires less clutch work. If you do a series of very close obstacles requiring a burst of throttle, it is easier to keep your speed down. (think - log, log, log) If the throttle does get away from you, the bike runs out of rpm sooner so is less likely to squirt out from under you. A 9 is even better for these things but made it harder to get over larger obstacles so not desirable. It felt like it took away the bikes reach.

Ok I gues so, i moved timing back to standard which gave it a good strong torque and instant power from just touching the throttle, dont really like a muddy feel as I like sharp throtle responce,

Id agree the 10 tooth feels like you cant stall the bike easy and will lift the front wheel no probs when you want it.