Mountain Bike viability [ frame size mounting ]

[andyinchville1]

HI,

The ONLY bikes I have ever put engines on have been mountain bikes.

I have done that since a mountain is built way beefier than your typical road bike or cruiser for that matter...Also, If you get a higher end mountain bike than can be as light as or lighter than a less expensive road oriented bike

My 2 demo bikes (I work a full time job and hawk my "Super Cycles" at flea markets and on the downtown mall part time....It's fun to show the bikes and heck if I make a sale the $$ aren't too bad either) are a Trek 7000 and a Specialized stump Stumpjumper....I got both bikes at an auction....$70 each and ready to go except for the flats.

I really have never off roaded them because I think the really serious trails are very slow speed twisties and hills so extreme a 44T sprocket is WAY over geared...Then engine woud be constantly lugging from the slow speeds or the clutch would be frying because of the need to constantly slip it to keep the engine from stalling...Now if I had a my machine shop friend make me a 72 T sprocket we might be able to tackle a few trails! (of course road speeds would be sooooo slooooow...So in a nut shell (for me at least) I haven't really off roaded because of gearing issues.

Andrew

 

[locoWelder]

Re: I do not think...

I do not think there is enough room for a motor to fit that bike. That is my guess. It does not look like enough room to me.

I have to agree with Daxs, it seems not to have the room in the frame for the motor

 

[bamabikeguy]

thatsdax and Loco,

I will apologize if I misdirect somebody, or give a bogus link, admitted out of my element re: Happy Time.

But, I need clarification, because I've seen pix of Schwinn Cruisers fully decked out, there is one specifically (I can't find readilly), the $450 green one with the headlight on the front fender.

Here's the Ottawa sample:

Heres GoYouGoodThings Raliegh

And we all have heard my complaint about my sloooooow dialup, here's mefonz's Schwinn, the only handy one I could find without an hour search:

Why is the Ottawa Schwinn too small? Like I said, if you could point out "where" the Happy Time will have the squeeze, I'll know next time I do a quick craigslist search.

Thanks from an ol' dog learning new tricks.

Note, I'd like to move this over to "Bicycles/engines..." as soon as you point out how my eyesight is failing even further... :???:

 

[Demosthenese]

wow, thanks for all the feedback, this forum is intense.

just checked ups tracking from work, my engine is in ottawa being delivered (glee), so i'll know tonight about the space issue, which has been on my mind . If it fits, it will be tight, that's for sure.

Assuming the Norco is big enough, i think the plan is to fabricate some mounting brackets and avoid drilling the frame in any way. If it's not big enough, im probably gonna be calling that craigslist guy and mounting it stock on that.

 

[bamabikeguy]

wow, thanks for all the feedback, this forum is intense....

Assuming the Norco is big enough, i think the plan is to fabricate some mounting brackets and avoid drilling the frame in any way..

Well, I misunderstood, these intense guys amaze me too, know what a Norco is from memory, I thought they were saying the Schwinncruiser was too small..... psheww :???:

No drilling the frame, you have graduated to the next level by repeating that maxim. 8) 8)

Moving this to "Bicycles, engines"....

 

[Demosthenese]

ok, so i have it, and im happy to report it JUST BARELY FITS. with the carb on and the spark plug in the spark plug wire literally touches the bar slightly. I suppose that means that changing plugs will mean unmounting the engine, but since i plan on making a good mounting plate with a double u-bolt setup i dont think it will be a problem removing the engine occasionaly. is that realistic? or will i have to be changing that thing too much to make that plan viable?

im also gonna replace the moutning bolts that came with the engine before i run it, those things are SKETCHY as hell lol. any instances of the egine block itself braking instead of the bolts?

im also gonna have to take swap out the back tire due to the disk brake assembly currently on there. i assumed id have to take it off, although i was hopeful there would be chain clearence. upon closer inspection, it doesnt come off! the disk part does, but the brake hub is part of the wheel hub.

im gonna photo this thing tommorow and post a build page, but ill report on the mountain-bike question as i figure it out

 

[azbill]

glad it fits
I would check into mounting sprocket to disc rotor (it will be easier on your spokes for one)
good luck and take build pics 8)

 

[Demosthenese]

now theres an idea

ty so much!

 

[Demosthenese]

as a final post here, i did manage to mount my engine. the downtubes on my mb are at least 2 inches thick, but i fabricated a mounting plate and grabbed 2 u bolts, problem solved.

locktite is not a suggestion lol, especially if ur planning on going over anything rougher then gravel.

 

[srdavo]

ok, so i have it, and im happy to report it JUST BARELY FITS. with the carb on and the spark plug in the spark plug wire literally touches the bar slightly.

If you need some sparkplug clearance, try a champion CJ7Y.
the overall length is 2 1/8"
some more on sparkplugs, with pics here---->

http://www.motoredbikes.com/showthread.php?t=5362