730cc.

 

how do you get a 725cc then just wondering? thanks for your info.

 

A 650 with a 105.5 cylinder bolted on is 725.56 cc

Some times they get rounded up bigger.

I have built some and they have done very good. One in race trim and in an oem frame ran 4.19 in 300ft. This is the fastest 725/730cc I have hear of.

 

I was on a business trip down in southwest VA and i stop at a track in LPR Raceway and saw a ds 650 in a stock frame with nos run low 20s back to back i think that they where a father and son race team but they sure knew what was going on i think they said it was a 725cc that was why i was wanting to know. it was strong for sure did not get a name or nothing. thanks bom for the info.

 

bom someone said that you do a 760 motor what do this run like in 300ft i think eric does a 770 what is the difference i am going to start this dragracing before to long and i am likeing the ds650s. thanks

 

The difference between a 760 and 770 is 1mm in stroke. I can do a 770 but I have the pistons already set for the 760. The 760 is a 4mm stroke and makes more torque than the 650/725s earlier in the power range. This will get you moving faster and pulling longer than the smaller motors. But even with lots of power , you have to have the set up to make it work.

Me and Mr HP has our own ways to make power. Don't mix and match our parts. They don't work well together.