I recently acquired what is supposed to be a ST V60 but the area inside of the "V" where the size would be cast is milled off and the number 60 is stamped there. Is it probable that this was originally a 56 that has been converted to a 60? The other V60's I have seen all have this number cast in, not stamped. What are bore and stroke dimensions for these two eng. and possibly  other notable differences. Thanks, Gordon in Sacramento.   Really like this site! No B.S.

I would venture to say ST60's are like a box of chocolates... heh...(It's almost as bad as asking one of the Fox Racer guys what is the exact dimensions of a bone stock Fox .35. Know one seems to know. )

The ST60, like the Fox 35, seemed to wander around the map quite a bit over the production cycle. Some with thin sleeves, thick sleeves, chrome, no chrome, muffler bosses, no bosses, standard loop porting, PDP porting ,56 with 60 cranks, 60's with 56 cranks. I never cease to be amazed when I open one up. I've stockpiled enough parts to keep my various versions running, whatever they may need, heh, which is always one solution.

I've got one ST60 from several years ago that I jokingly refer to as "Franken-Tigre".  At the time, all I could find were the longer con rods, so I used one. I figured, " what the heck, why not"?. It also had a bigger boss on the lower con rod crank pin hole, so I had to dremel out the case a little for clearance.

It had the effect of dropping the sleeve timing with the longer rod, and I had to use a lot of head shim to get clearance to the piston top. BUT.... you wanna know something? It's turned out to be one sweet running little monster. Deepest 4 cycle I ever heard out of a ST60, likes super low RPM and will swing a 13x6 in heavy wind without windup.

Sorry to ramble, enjoy your Tigre, they are fun motors and most all of them run decently enough if the ring not worn and is installed properly.

EricV

Sorry it took a while to get back to you, but I really didn't want to tear down a motor to get you that measurement...heh. Hence, I'm giving you the over all length of exactly 2". It is not the center to center of the holes, but the full OD length of the rod. I was surprised it came out exactly at 2", and had to double check it with my other dial caliper, which concurred within .0040 longer of exactly 2". I don't have a stock rod handy, but they are significantly shorter, and you will not mistake one for the long version.

Eric Viglione