Hi,
I am new to dirtrider (this is my first post).
Can anyone help me out with answers on the following
1) What sort of HP/ torque increase will be seen when increasing a stock 01 YZ426's piston/bore from 95mm to 97mm. Will it be across the board or say, better only at high revs.
2) What is the better selection in terms of piston compressions 13.5 or 12.5. Or put it another way, what are the characteristic differences of the power delivery of the two pistons. Assuming operation at around sea level.
3) In Australia we are limited to running unleaded petrol which has a maximum octane rating of RON 98. Will there be issues with running a non race gas with the increased diameter bore.
4) Obviously you need to run a 97mm head gasket, but this also mean that you have to modify the profile of the head as well.
5) I have seen some unexplained inferences on TT that there are some problems/limitations in the intake valve size when going to 97mm bore, is there any issue here.
6) Does anyone have a good jetting baseline to start from after increasing the bore.
Thanks
I am new to dirtrider (this is my first post).
Can anyone help me out with answers on the following
1) What sort of HP/ torque increase will be seen when increasing a stock 01 YZ426's piston/bore from 95mm to 97mm. Will it be across the board or say, better only at high revs.
2) What is the better selection in terms of piston compressions 13.5 or 12.5. Or put it another way, what are the characteristic differences of the power delivery of the two pistons. Assuming operation at around sea level.
3) In Australia we are limited to running unleaded petrol which has a maximum octane rating of RON 98. Will there be issues with running a non race gas with the increased diameter bore.
4) Obviously you need to run a 97mm head gasket, but this also mean that you have to modify the profile of the head as well.
5) I have seen some unexplained inferences on TT that there are some problems/limitations in the intake valve size when going to 97mm bore, is there any issue here.
6) Does anyone have a good jetting baseline to start from after increasing the bore.
Thanks