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Pre-Motorized Bicycle Information. Before you mount that engine to your bicycle frame, you'll want to know if the bike is ready for the engine! Ask our experts here for advice on what will perform well.

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  #1  
Old 10-18-2016, 10:02 PM
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Nanfoe Nanfoe is offline
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Default Help mounting thick tubing Trek Marlin 29er

I'm here with a mounting dilemma (literally). First of all this is the first time I'm going to install a CG on an aluminum frame. My knees can't peddle far anymore so time to convert the o'l hardtail to putt putt me along. I know iron/steel is the way to go (I have ferrous frames) but for now I have all the hardware for just one build so I would like to go with the only fully functional bike I have ATM which has trued rims and disc breaks. I have 2 different type forward mounts plus a universal on the way. I have a slab of 1/4 aluminum already bent, would aluminum on aluminum be as good as metal on aluminum? I'm just looking for some insight to mounting a aluminum frame. I have also the 27 tooth sprocket that goes on the disc hub. I plan on cutting to fit the CG chain. The motor is balanced and ported piston skirted and topped with an aftermarket head. Intake is port matched with the basic manifold/carb upgrade from stock. I have a big boy Reed with a Keihin clone on another CG ATM which I may incorporate to the green CG. Heres some pics of the break in bike and motors. Any help would save me some brain cells!! Thanks.
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Last edited by Nanfoe; 10-18-2016 at 10:06 PM.
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Old 10-20-2016, 05:06 AM
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Default Re: Help mounting thick tubing Trek Marlin 29er

As long as the mount is solid to the frame with no movement your golden. Cheap Chinese steel is softer than aluiminum as it seems anyhow. Lol. Just recheck tightness after some miles are racked up.
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Old 10-20-2016, 12:59 PM
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Default Re: Help mounting thick tubing Trek Marlin 29er

Dam for steel to be softer than aluminium it has to be real crap. Thank you sir.
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Old 10-20-2016, 01:56 PM
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Default Re: Help mounting thick tubing Trek Marlin 29er

Quote:
Originally Posted by Nanfoe View Post
Dam for steel to be softer than aluminium it has to be real crap. Thank you sir.
Add the word brittle to soft also. LOL
On another funny note: There is a video posted on You tube somewhere where a guy remounted his engine using Duct tape after one of his Chinese mounts broke and he said it worked great.
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Old 10-20-2016, 08:56 PM
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Default Re: Help mounting thick tubing Trek Marlin 29er

She's on now, waiting for other parts.
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Old 10-20-2016, 10:42 PM
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Default Re: Help mounting thick tubing Trek Marlin 29er

Looks good, Any way we can see the other side of the bike too and a picture of how you mounted your engine if you get time. Exhaust looks pretty sweet.
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Old 10-20-2016, 11:23 PM
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Default Re: Help mounting thick tubing Trek Marlin 29er

Thanks. Yeah I cheated big time plus I need longer studs for the rear mount.
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File Type: jpg 20161020_232504.jpg (119.7 KB, 12 views)
File Type: jpg 20161020_232521.jpg (383.3 KB, 15 views)
File Type: jpg 20161020_232533.jpg (484.1 KB, 13 views)
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Last edited by Nanfoe; 10-20-2016 at 11:30 PM.
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Old 10-21-2016, 11:27 AM
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Default Re: Help mounting thick tubing Trek Marlin 29er

Looks clean. Gee it's wedged in their pretty good, as in tight fit. My only concern is angle of the carb could cause a problem. I have one bike that has a angled carb also a and I worry about a lean condition it could cause as I am no expert on carb angle and any side effects it may cause. So I'm interested if and what problems it causes...if any? I would imagine their is a line one can't cross on it, what that line is I do not know personally. Some offset intake manifolds can rectify it but are they ever bad quality. I ordered one and it was full of bad welds with numerous pin holes in the welds, so I had it re welded, but it didn't help the angle much. Then I bought a double offset one and the mount flange was warped so bad I couldn't mount it. Anyhow does your bike run well?
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Old 10-21-2016, 01:31 PM
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Default Re: Help mounting thick tubing Trek Marlin 29er

A couple of small recommendations:

On the third picture in your last post, remove the studs in the engine and replace them with allen head bolts with some loctite.

The front mount is OK for now, but you may need something stronger in the future. Check eBay for a cnc front mount. They cost a little more, but it's way stronger than the Chinese u-bolt.

Edit: also you should insulate the white wire. If that grounds out, your engine won't like it too much.
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Old 10-21-2016, 01:56 PM
Slogger Slogger is offline
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Default Re: Help mounting thick tubing Trek Marlin 29er

Nice bike!
That bike has everything to go ahead and do it geared.
Look into KCVale's excellent work. Here's a CG geared bike of his-
http://kcsbikes.com/topic.asp?TOPIC_ID=964
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