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Discussion in 'Motorized Cruiser Bicycles' started by Frankenstien Bikes, May 19, 2011.
you also will need to offset the motor mounts to clear them thick bricks
My first build was with a cranbrook & after app 30 miles the front fender showed a crack beggining, I am building my second using a shwinn drifter with Skyhawk GT5
Tanks Glenn, what did u do to the mounts to off set them? Grind them on one side? Also on the exhaust the rear is already dropped some, any lower and it will hit the crank sprocket.
See engine is already low in rear.
New wider GT5 SuperRat front mount fits nice on wider front down tube
I do have an idea to offset it.... Use a flat plate of steel like the one supplied for bikes with big front down tubes, and drill new holes for a u bolt, and do the same for rear.
Also thout of something similar but instead of a ubolt use some scrap tube cut in half that's a correct size to fit over the front down tube and weld tabs onto that cut in half tube to bolt onto the new flat plate on the mounting studs out of the engine, sounds confusing I know, but similar to the SBP large ubolt mount.
Another idea, Was thinking something similar to the SBP large front u bolt mount ,filpped bracket that mounts to the stud area but instead of studs use same thread size bolt but with a counter sunk allen head so head does not hit the front down tube when I offset the engine. Will do same type of thing for rear seat tube mount.
This should also allow me to raise the front mint more, and lowering the rear, and might give me more clearance so the peddle wont hit the expansion exhaust pipe....
Looking good! This will help me with my build a lot. Thanks for all the detailed shots and progression along the way!
Thanks, if you need any specific shots let me know.
i used 1/4 inch plate and off centered 1/2 inch...u bolts will work fine but i used the easy way and went through the frame almost everyone on this forum will tell you not to do it that way but its a nice clean look and it is a steel frame done it to a few bikes never had a problem
Thanks thats what I was planning on. and some washers in between the sprocket and hub mounting flange.
Any pics of the plate and mount Glenn?
Oh , and what about the rear mount? same deal with the plate?
Been thinking about your expansion chamber clearance issues and found these:
One Piece Cranks
Hopefully I can finish my build soon to help get some more info to trade off with ya!
Running wider tires, and wider rear rim really makes things difficult on the Cranbrooks, just wanna start pulling my hair out!!!!! Going to bend or cut off and re-angle the coaster brake arm, so it does not hit my sprocket, and allow me a bit more room to offset my sprocket hub assembly. So Tat my 415Chain will not rub my Thick Brick Tires.
also going to thread on an extra nut against the nut on the axle on the inside of the drop outs to widen out the frame a tad, giving more chain clearance if needed.
could i ask where you got your springer fork?
So Today I decided to bend my brake arm, so I can offset the rear sprocket some more so the 2 won't rub, and also fabricated two new Front Engine mount that offsets the Engine a 1/2", Thanks Glennbo!! One uses a UBolt and has a bend in the plate, the other is flat. I decided to use the one with the bend because it allows me to drop the front of the engine and be able to set the carb up level. Next is to fab up a rear mount, then cut the flange off my expansion chamber so I can rotate it a bit so the left peddle wont hit it. Here are some pics of the bent coaster brake arm, and the two Front Engine Mounts.
Now with the offset engine and sprocket my chain does not rub on the tires, Woooooooooo!
Today I was able to get my Engine mounted in the right spot with my offset front mount and rear mount, gave me plenty of room to install my new air filter, and I also cut and rotated my expansion chamber to clear the peddle from hitting it. Now just need to install the clutch, kill switch, chain, and clean up the cables routing, then test it all out : )
In this pic the rear studs will be replace with bolts. Studs are just there for mock up.