Originally Posted by
THEBIGBULL
If you can get your hands on a 55t or 60t 48p Robinson spur it bolts right in and the only grinding you need to do is remove the web below the motor mount. I have used anywhere from a 35 (indoor carpet) to 41 (outdoor asphalt) tooth spur depending on the track.
Originally Posted by
rcbo
I run a 76t spur with 45-50 pinions.64pitch.
Hmmm...guess I'll have to take a look at it. He wanted 48p gears so I told him to order the Robinson 55t spur (just a nick smaller diameter than a 76t/64p spur) and a 35t pinion which will put him just a shade under 4.0fdr. He says they won't come together, and I DO remember having to mod the cam to get 4.0 a few years ago (using a 78t spur?).
I'll have a look tonight. Thanks.