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Motorized Bicycle General Discussion All topics regarding bicycles with engines.

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  #561  
Old 11-29-2011, 11:51 AM
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GearNut GearNut is offline
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Default Re: Motorized Bicycle Take a Tip...Leave a Tip

Do not mount it with rubber between the frame and engine mounts unless you engineer a standard automotive design.
Here's a few references:
http://motorbicycling.com/f6/rubber-not-27364.html
http://motorbicycling.com/f6/anti-vi...nts-34336.html
http://motorbicycling.com/f6/afterma...nts-34114.html

There are alot more if you do a search for them.
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Last edited by GearNut; 11-29-2011 at 11:54 AM.
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  #562  
Old 11-29-2011, 12:42 PM
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Default Re: Motorized Bicycle Take a Tip...Leave a Tip

Quote:
Originally Posted by GearNut View Post
Do not mount it with rubber between the frame and engine mounts unless you engineer a standard automotive design.
Here's a few references:
http://motorbicycling.com/f6/rubber-not-27364.html
http://motorbicycling.com/f6/anti-vi...nts-34336.html
http://motorbicycling.com/f6/afterma...nts-34114.html

There are alot more if you do a search for them.
Aaah, good to know. Wish I didn't get that rubber now, it's actually rather expensive at 15 bucks a square foot. I'm sure I can find a use for it. The real reason I wanted to use rubber was to prevent the mounts from vibrating and slowly working the aluminum frame down till it brakes. Maybe that won't happen at all or not for a very long time. Talking with mdlee he warded me against aluminum frame because of that but there aren't many steel frame mountain bikes. Looks like most everyone else has not had a problem though so I'll just go for it. Especially if I use my older schwinn bike I'm not to worried about damages.

Very helpful information, thank you!


@rustycase- I agree that taking apart this motor is risky but it is also risky to not replace parts on it. Guess that just makes it a risky motor!..
I'm reading through this thread
http://motorbicycling.com/f4/bgf-t80...own-34793.html
Good info on taking it apart. However for my use I think I'm going to stick with replacing the bolts with the ones from SBP. I don't have head bolt replacements though as those are also 6mm or 8mm which I'm not sure which size is mine yet so I'll follow your advice and leave that alone for now.
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  #563  
Old 11-29-2011, 06:43 PM
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Default Re: Motorized Bicycle Take a Tip...Leave a Tip

Ditto... IMO 1/4" rubber mount will do you no good, and possibly create many probs from the power unit floating around in the frame!
Perhaps a swatch of 1/16" garlock where the engine bears against the downtube *might* not be a bad idea...

...inch lb torque wrench isn't gonna be of much value for auto maintenance...

I can guarantee you'll NOT get 2k miles without constant maintenance and at least minor repair. What we hope for is to avoid *major* repair for the longest period of time!
Some folks have done really well !

...if you wish to cart the motorized bicycle in a vehicle, there should not be much smell.
Drain the tank and let the carb run dry... there will be less than an ounce left.
If you are sensitive, maybe wrap a towel around the motor unit before loading into the vehicle???

lol
sounds like you are having fun already!
rc
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  #564  
Old 11-30-2011, 03:39 AM
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BarelyAWake BarelyAWake is offline
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Default Re: Motorized Bicycle Take a Tip...Leave a Tip

Quote:
Originally Posted by Rocky_Motor View Post
...The real reason I wanted to use rubber was to prevent the mounts from vibrating and slowly working the aluminum frame down till it brakes. Maybe that won't happen at all or not for a very long time. Talking with mdlee he warded me against aluminum frame because of that but there aren't many steel frame mountain bikes.
I've found the anti-aluminum bias to be completely unsubstantiated, I've yet to see an aluminum frame broken as a result of motorizing - what failures I have seen were a direct consequence of poor mounting/build technique, such as "rubber" mounting and/or improperly torqued/substandard fasteners, which would ofc be problematic regardless of what material the frame is made from.

Having said that, the frame's quality should be examined thoroughly - regardless of if it's steel or aluminum it should have quality, uniform welds & a good design... this doesn't mean "expensive" but just not shoddy like the very cheapest of the box store bikes, which while many have used w/success, they can't be assumed to be all constructed the same, which is why there's some that have failed and some that haven't - like the Cranbrook's upper chainstays *shrug* (steel bike BTW).

As an example, my Schwinn Aluminum Comp mountain bike. While not a "quality" bike by any serious bicyclist's standards and was a mere $200 - the frame's design is exemplary (strength/gussets etc) with simply gorgeous welds, which is why I bought it instead of a cheaper steel bike. While the other components are pretty much junk (derailleurs wheelset etc) - the frame itself has proven incredibly rugged, surviving over 10,000 miles, years of unrelenting abuse (rough roads @ stupid speeds) and even a major, "cartwheeling" crash (a friend & he's ok lol) without even a sign of fatigue or any damage at all to the frame - despite the fact it's aluminum.

As an example of something that should be examined no matter the material, here's my (yea, filthy) Schwinn's welds & gusset vs an inexpensive steel mountain bike's complete crap welds... and that isn't near as bad as I've seen on some o_O (click to view detail);


(I don't actually advise this bike as a candidate for motorizing, not because it's aluminum - but because the engine doesn't actually fit w/o a LOT of mount mod/fab that isn't worth the bother)





It's not the material it's made from, but how it's made.

Last edited by BarelyAWake; 11-30-2011 at 04:09 AM.
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  #565  
Old 11-30-2011, 01:04 PM
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Default Re: Motorized Bicycle Take a Tip...Leave a Tip

Well that certainly makes me feel a lot better about using the aluminum frame! I won't use the rubber I have for sure then. I actually am going to use my current schwinn bike to mount the motor Hopefully it fits though. It barely makes the specs for that image dipicting 11" between the bottom of the top tube to the bottom of the down tube. If not I'll get another bike which isn't a problem. I would use this GT avalanche 2.0 I have but the downtube is not the regular circular tube, it is widens out to much more oval like as it goes down...... I'm trying to sell it, hopefully can get it gone soon I don't like it that much. Has a front disc brake and boy I tell you those brakes are wonderful!

I do have a thread on it though..http://motorbicycling.com/f6/flat-downtube-35553.html

I love the way your bike looks, rugged and strong. Takes on the elements!
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  #566  
Old 12-06-2011, 05:13 AM
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Default Re: Motorized Bicycle Take a Tip...Leave a Tip

Lube your chains, grease your gears, make sure to clean both beforehand. Makes a big difference in chain/gear noise and wear.
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  #567  
Old 12-06-2011, 11:52 AM
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Default Re: Motorized Bicycle Take a Tip...Leave a Tip

Speaking of chain lube, this is the best stuff ever! Found in most reputable motorcycle shops. Maxima Chain Wax - KneeDraggers.com
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  #568  
Old 12-14-2011, 01:43 AM
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Motorbikermark Motorbikermark is offline
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Default Re: Motorized Bicycle Take a Tip...Leave a Tip

I had the same problem as many with the clutch handle that came with my kit , Crappy quality, didn't fit my bars etc, Decided to replace with old style front shimano 3spd shifter. Holds in fine and pops with just a flick of the thumb...Looks sort of vintage also, and clean no brake handle.
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  #569  
Old 12-18-2011, 02:51 PM
DawgBarber DawgBarber is offline
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Default Re: Motorized Bicycle Take a Tip...Leave a Tip

Question : I tightened motor chain after readjusting the motor..yesterday ..it has about an inch give...bur now after going 35 ...40 yesterday I seem to be topping out around 25...suggestion?
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  #570  
Old 12-18-2011, 02:54 PM
DawgBarber DawgBarber is offline
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Default Re: Motorized Bicycle Take a Tip...Leave a Tip

And I have a lot of vibration on the top end of
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