checking in from Western Ma.

hey just thought i'd pop in and say Hi
I am working on my frist motorized bicycle project.
I started with a Giant Boulder MTB frame and a 49cc china engine kit.
I want to give it an oldschool hotrod feel
so the plan as of right now is
paint the frame and gas tank primer grey with clearcoat flames
have the hubs and spokes powercoated white
have the rims powdercoated red
find a set of wide whitewalls that will fit mtb rims
working headlight and "stop" brakelight
header wrap on the pipe

on the "possible but not sure list"

build a set of brass knuckle peddles
build a set of bars out of chain
maybe tripple trees

any thoughts

pics as I progress

Welcome to the forum. Sounds like you have some great motorized bicycle ideas. Glad you joined us..........................

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Welcome to the forum That will be one cool looking ride

well, my project hit a few snags last night
the bottom tube on the Giant is far too wide to mount the engine without substantial modifications witch we found out after the rear sprocket was assembled at about 11:00 pm
so with a couple quick calls to friends looking for suitable donor bikes I was able to trade my friend Chris a beer and a chance to ride it when it was done for a complete 1960s or 1970s Columbia in working order

by 2:00 am we called it a night but we have
the sprocket mounted
engine in
controls on
cdi on
wiring done
tank on
I have to shim the rear tire because we are having some rubbing issues chain to frame wise

I have to grab a chain break and some fuel today
and with any luck I will have some youtube videos up

Many guy's are using a muffler clamp for the oversized tube.



Don't know if this is the same problem you are having

Interesting, verrrry interesting. What kind of muffler clamp is that? My picture is a little fuzzy but I like the way the mount "stands off" from the frame. I'm not a big fan of drilling the frame for motor mounts.Walter F.

that would have solved my problem

on to build day two
we got the bike running today I took about 3/4 of a mile on it to shake out any bugs, then my buddy who has been giving me a hand on the project took it out I have a video of him going passed the house on it.... about 5 seconds after I stopped taping I watched the rear end of the bike trying to get out from underneath rick (my friend) and then I heard a sliding noise, and then a POP and then the bike stopped moving., sensing that some thing MIGHT have failed I decided to go take a walk and look at the damage.

the chain tensioner slide and drove the chain off the rear sprocket twords the rim the chain got cought between the sprocket and the spokes locking the back tire destroying the rim/tire/tube.... oh well nobody got hurt so its off to the bike shop to see about a good used rim assembly when we stumbled across another free bike this one looks very road worthy so we chainged all the components over and will be testing tomorrow

I will have pics and videos on youtube shortly

chain tension help

Notice the screw and bolt that go threw the frame ( In red ) Norman used both but you could fust use a bolt or small sheet metal screw...This will keep the tensioner from going into the wheel and spoke's. Link for the thread is above.

Oppss, sorry that is not the pic of the muffler clamp....that is a tower standoff clamp...I've seen them at RadioShack I think..

I drilled my frame, going on year five and over 4,000 miles and have had no problems....

Here are some exsamples that I have found...it's the kinda like the clamp you would use for your old TV attenna on your roof.

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hey, thank you very much for the help I am glad I joined this forum, most of the time (on other forums for other hobbies) if you ask a question or have a problem, you get flamed off the board