eclectic cowboy
Member
I've broken 6 sets of forks before I went to the old Chubby. Had to mod the steering head for that. Even had a sidecar on it for a while but the stresses were stressing me out! I check the frame for cracks every couple days
Calling the China Girl crankshaft experts
- Thread starter eclectic cowboy
- Start date
Thats one of the reasons why when I got my present bike, the Hyper Beach Cruiser, the only thing I used was the bike frame, handlebars and pedals and crank...Everything else had to go...lol.
This is the link to the "tutorial" I made that shows what I did and how I did it...Enjoy.
Whats the best bike for a 2 stroke?
Were miles away, but I bet our side of the railroad tracks are pretty similar. Before I found cranbrook in trash, I picked up a 74 schwinn world traveler & a 74-75 schwinn varsity people were throwing away, was going to build 1 of them, but long skinny front forks were scaring me. They can be...
motoredbikes.com
And don't forget, Now with some metal, The new and improved, made with pure Chinesium...lol.Chinese Tolerance Specifications "Close Enough is Good Enough "
My Huffy frame broke on the seat post tubing, right where the factory drilled holes for the optional water bottle were drilled into the frame.
GW's Motorized
Well-Known Member
Sweet bike! I have been considering a seat like yours. Here's my cranbrook. Im hoping to get better wheels and forks on it soon. I might just rebuild the whole thing onto a hyper frame. I don't really like the cranbrook frame all that much.
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eclectic cowboy
Member
I'm curious to know where your frame broke
I already posted that in post #24 just a few up from this one...lol.
eclectic cowboy
Member
I've seen a couple motorized bicycles that had frame failures of the seat post tube. There must be some serious stresses on that tube. Doh, forgot to buy cigarettes on the way home....back on the bike! Thanks All!
Yep, there certainly is, the rear motor mount rides that tube and my fat arse is sitting on the seat attached to that tube...lol...That's a double whammy serious stress situation for any bicycle...lol.
I have no official book to direct you to as this isn't a spec found for these engines. This is just a range that I have used that covers a broad spectrum of similarly sized 2 strokes in chainsaw applications.
When pressing the cranks together I will aim for a crank to rod side clearance of around .60mm with the rod laying on one half when pressing the crank together.
This is one of those specs that really only matters for assembly as most engines rarely ever wear out the side gap tolerances (usually around 1mm gap or a bit larger). So you have a little wiggle room to be on the loose end.
