QUICK FIT FRONT MOTOR MOUNTS
Tip Number One:
These engines fit best on 70 degree angled V frames, but sometimes you will find that the front motor mount won't fit flush to the down tube. Although it is recommended that you machine a solid aluminium motor mount specific to your bike frame if the adapters don't fit; Don't panic here's a tip you could try if you find yourself with this type of frame.
Pop down to your local automotive store and ask for some:
This stuff is like Plasticine you cut some off knead it well and make your shape. Place it on the down tube and sit the engine on top. This will fill any gaps and dry as hard as metal.
Then you drill through it and the frame and mount your engine as usual.
See the illustrations below ...
Side elevation ...
Bottom elevation ...
Tip Number Two:
On many recent Mountain Bike you will find the cable for the back brakes and gears run along the top of the bike frame tubing. This can cause allot of distress when trying to install your petrol tank. Normally you would have to re-sheath any naked cable so it doesn't rub against the bottom of your tank.
Not anymore, try this tip to solve this problem. Again cut some epoxy putty knead it well and make a mould that fits over the cable as in the example below. A good idea is to spray some WD40 before applying the putty so it doesn't stick to the cable. As the putty is drying keep pressing the brakes and change the gears to keep the cable moving. Wait for it to cure reasonably but not fully and sit your tank on top, attach the bottom brackets and there you go, no more rubbing below the tank.
Tip Number Three:
A good tip to reduce vibration is to cut a little piece of inner tube and fit it inside the back end motor-mount as in the example below.
Tip Number Four:
Here's another tip for smooth throttle operation. Take your throttle housing apart and look for plastic that is blocking the cable path. Take a small file and gently file away any excess plastic on the cable path inside the housing, this helps.