“700” Kit – September 2007
“700” Kit – We refer to kits using the 105mm piston and OEM crank shafts as “700” kits. In fact it depends on the model of crank you use of course as to what cubic capacity you actually get. A 2000-2003 crank if it has an 82mm stroke will produce a 710cc engine, a 2004-2008 crank if it has an 80mm stroke will produce a 693cc engine.
.JPG)
We have run both engines for many hours. The 693 is more reliable than the 710 for 2 obvious reasons 1) The capacity and hence power is lower so the parts are less stressed 2) The pin on the 80mm cranks is 35mm up from 32mm on the 82mm stroke cranks and so is much more resistant to flexing. Both engines are as reliable as their stock equivalents in our experience in Sidecar.
Generally speaking the “700” engines are very reliable. They last as long as at “650” in the same application. I.e. if you are getting 100 hours out of your road-registered “650” supermoto engine or more you will get 100 hours or more out of the “700”. If you are blowing up “650” engines every week-end in a Sidecar the same will happen with a “700” kit. It won’t be any worse but it won’t be any better. There are other modifications that greatly improve the reliability of the engine especially when you are using it in a Sidecar. These are 1) Main bearing mod (Details will be provided in a later post) 2) Camshaft 3) Oil cooler