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Mounting Techniques for Bicycle Motors Every frame is different. Share and ask questions about mounting your engine kit to your frame or rack

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  #21  
Old 03-07-2014, 09:16 PM
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Default Re: Rack mounting a chinagirl

It's Too Many Good Ideas Syndrome, you've worn your brain out Maniac.

Hope you will be feeling better tomorrow
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  #22  
Old 03-07-2014, 09:35 PM
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Default Re: Rack mounting a chinagirl

Two brain cells dragging a third....
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  #23  
Old 03-08-2014, 12:40 PM
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Default Re: Rack mounting a chinagirl

And one is about to pass out right?
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  #24  
Old 03-09-2014, 09:57 PM
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Default Re: Rack mounting a chinagirl

Finally found the time to test ride the rack mount this evening.

The brand new engine (Thanks to Jim Wilson at Pedalchoppers!) fired right up and off we went for a nice half hour test ride around the neighborhood. My initial impression is that this is one of the nicest chine girl powered bicycles I have ever ridden. Even though the bike itself is rather cheap and flimsy, with the motor pushing you along, it rides like a Cadillac! All the motor and intake noise you hear in a frame mount bike is behind you and inaudible. All you hear is the exhaust tone. No ringing, gear whine or tinny side cover noise at all. I'm very pleased with the first ride and am looking forward to playing with my newest toy! This is turning out better than I had hoped.
It was problem free with nothing flapping or bending. No grinding noises or ugliness to sully my very first miles. I did get some chain stretch from the cheap stock chain so I will have to redo the mount or install some kind of tensioner to get the chain right.
I'm considering a roller guide like this.


Also have a very small issue with the seat frame tapping the pipe a bit at full travel, but this will be very easy to fix by simply jacking the frame up a touch by moving the shock mounting point. Instant clearance and a slightly stiffer spring rate for ten minutes work. (This easy fix is why I was downplaying the problem to those of you who warned of interference)
Trying out the roller setup tomorrow. If it doesn't work as well as I want, I'll start working on a fully adjustable pivoting mount like the final version I've been seeing in my minds eye. This ugly hack job of scrap and bits is just a first draft.
Please believe I do nicer work than this rough prototype. This was built by me holding stuff in place and blind tacking it together, stepping back and eyeballing it, bending to suit, then welding on bits of handy scrap until it wouldn't move anymore. I have a very organic process when trying to create order out of the chaos that is my usual work area. My prototypes tend to be very ugly and disorderly looking, yet very strong for the purpose needed. I'm real good and making whatever is at hand work. Making it pretty and sleek is something that takes me lots of experimentation.
On a side note....
This shorty tuned pipe is one of the best sounding setups I've had. Very mellow and powerful sounding with a dirtbike rap and no tinny weedeater noises. I think it's from the large silencer diameter and straight through construction. It is very heavy however and I still need to add a second mounting bracket for the pipe to help carry the loads. Need to settle on final engine placement first and figure out a chain adjustment system.
The engine is brand new so I cannot tell if this sweet sounding pipe will help power yet, but the engine does feel very snappy and responsive even with less than 10 miles on it.
I have seen this before with my builds. The (stock) chinagirl likes a pipe with a very short run better than long rear exit setups.
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Last edited by maniac57; 03-09-2014 at 10:17 PM.
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  #25  
Old 03-10-2014, 08:36 PM
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Default Re: Rack mounting a chinagirl

Got the chain sorted and rode the wheels off the rack mount today.
Added allen head capscrews and spacers to adjust chain. It's a bit tricky to reach but works quite well.

After riding it for a couple hours, everything is still nice and solid. I'll be adding some more structural braces to stiffen the rack later. I'm also going to jack up the swingarm by moving the shock mount to gain seatpost to engine clearance.

I'm really digging this build so far. The cushy suspension and quiet engine make it very enjoyable to toodle around on! Did I mention how great the short pipe sounds? Super mellow and deep low tone. Not your average chinagirl!
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Last edited by maniac57; 03-10-2014 at 11:11 PM.
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  #26  
Old 03-10-2014, 09:19 PM
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Default Re: Rack mounting a chinagirl

I'm intrigued with this. As much as I like in-frame engines and especially China girls mounted that way, this is indeed a step away from the norm and an inspiration. Not something just anyone should try but certainly something to consider if a person is looking to motorize a full suspension bike.

Great work and innovation, Maniac. You've earned your username.
Thanks for sharing the build and keep us informed or further developments.

Tom
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  #27  
Old 03-11-2014, 02:43 PM
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Default Re: Rack mounting a chinagirl

Pretty good job. Having the exhaust sticking out the back is a good idea too, because it keeps the splatter off the bike. The only downside is the seat has to be so high.
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  #28  
Old 03-11-2014, 08:09 PM
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Default Re: Rack mounting a chinagirl

Quote:
Originally Posted by biknut View Post
Pretty good job. Having the exhaust sticking out the back is a good idea too, because it keeps the splatter off the bike. The only downside is the seat has to be so high.
As it sits now, the riding position puts far too much weight on your wrists. I bet a road bike rider would fell right at home on this bike. For me, it needs a set of high rise BMX bars to get me more upright and take the weight off my arms and wrists. This will require longer cables too it looks like. I like my seat high so that's not an issue with me. I replaced the narrow saddle with a big wide spring pan and it sits very nice. I flipped the mounting hardware to gain clearance and the pipe just barely kisses the spring when the suspension moves. Nothing banging, just a tiny rub. I'm satisfied with it right now, but looking for higher bars.
It rides so sweet! Spent another couple hours today breaking the motor in further. It just keeps getting better.


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  #29  
Old 03-11-2014, 08:13 PM
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Default Re: Rack mounting a chinagirl

Maybe a pipe change would help....


Pro Circuit RM 250 pipe.
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  #30  
Old 03-12-2014, 03:55 AM
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Default Re: Rack mounting a chinagirl

That looks like it's one of those, 'light blue touch paper and stand well back' type of pipes!
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