I've mounted the motor as flush as i can with little to no gap with the mounting hardware. I put electric tape below each of the mounts to make it a tight fit. all the bolts have been tightened down as tight as i can, and yet it still moves. any recommendations or suggestions to fix this problem would be greatly appreciated! will post pics soon.
HAPPY RIDING.
1. If the engine can slide down the seat tube, I'll
guarantee that the engine is not mounted correctly. If it were it would be
IMPOSSIBLE to slide down. The front mount wouldn't allow for this to happen.
2. It is possible that the engine mount is too large for the tube. I have two different engine mounts, one fits perfectly, the other is too large. With one not large enough it is easy to fix. The clamping service can be enlarged by sanding. You can use a piece op pipe or PVC the same size as the tube, wrap with sandpaper, and sand till you have a proper fit.
3. A mount that is too large for the tube can be shimmed out, dang I hate to do this, but you can get a copper or brass pipe coupling, cut in half (from end to end), and fit as snug as you can.
4. Use proper torque.. 50 to 70 INCH pounds (
NOT AS TIGHT AS YOU CAN). I find that in order to torque the nuts properly, the engine mount clamp gets in the way of the socket. To correct this I install a shim (about 1/2"long) between the clamp and nuts.
AS far as what Gear Nut mentioned above, believe it. Proof in pictures if you want.
Proper mount fit. Notice the shims.
http://www.motoredbikes.com/album.php?albumid=1018&pictureid=6909
http://www.motoredbikes.com/album.php?albumid=1018&pictureid=6663
Notice the space between the mount and clamp at the studs?
Drill baby drill....
You can see that the mount on the left is too large for the tube. Also pictured is a engine mount shim. Easy to bend, form fit and cut to fit the engine mount.