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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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  #11  
Old 10-21-2016, 02:02 PM
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Nanfoe Nanfoe is offline
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Default Re: Help mounting thick tubing Trek Marlin 29er

Yeah I'm waiting on a universal

http://www.ebay.com/itm/262519605050...%3AMEBIDX%3AIT

But I don't think it will fit as the front tube is so wide, maybe to the rear it would fit. I need different hardware and yes the align screws are a plus. The motor is almost done with break in, she sounds like a different type of 2 stroke, throaty, more vroomy than wingy. And she picks up just fine, she jumps to 28 mph and tops @ 37 mph but that was with 40:1, a #.70 jet, 32 tooth and stock muffler haven't tried the 27 yet. Dude at the bike store looked at the Trek and said with a 27 tooth I should have no problem doing 45 mph so I'm glad I have disc breaks. I couldn't get the disc ring off the rim to install the sprocket. My aligns kept slipping and I don't want to strip. I realy want to do as much work as I can myself. These are little things that always pop up and sooner or later every mech has to engineer something in a pinch. Thanks again gentlemen for your input.

Misprint: not 40:1 but 16:1
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Last edited by Nanfoe; 10-26-2016 at 04:34 AM. Reason: Misprint
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  #12  
Old 10-21-2016, 02:06 PM
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Nanfoe Nanfoe is offline
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Default Re: Help mounting thick tubing Trek Marlin 29er

Quote:
Originally Posted by Slogger View Post
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
Thanks man and you should know I am totally interested in the jackshaft setup.
Especially if it lets the cg rev lower for cruising. Would love to do 40 MPH @ 5500 rpms!
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Last edited by Nanfoe; 10-21-2016 at 02:20 PM.
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  #13  
Old 10-21-2016, 03:11 PM
Slogger Slogger is offline
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Default Re: Help mounting thick tubing Trek Marlin 29er

I don't even know how geared CGs generally do, but yours looks pumped up and snarly so I think it'll pull it.
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  #14  
Old 10-21-2016, 05:12 PM
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Default Re: Help mounting thick tubing Trek Marlin 29er

In the future I would like to build something like this
I wonder what frame this is.

http://s1250.photobucket.com/user/sc...ji99u.jpg.html
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  #15  
Old 10-22-2016, 08:00 PM
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Default Re: Help mounting thick tubing Trek Marlin 29er

I believe its a Felt frame of some type, don't know the model. Looks expensive and bad to the bone.
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  #16  
Old 10-24-2016, 08:54 PM
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Default Re: Help mounting thick tubing Trek Marlin 29er

The universal arrived today but it isn't going to fit this frame. I have a vitamin bottle that's a little bit less wide as my down post here for ref. I'm gonna take her to a place here localy and just let them do it. I'll craft on my other frames and just maintain this one when it's done. I'll post when she's ready.

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File Type: jpg 20161024_194525.jpg (665.9 KB, 8 views)
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  #17  
Old 10-25-2016, 10:19 PM
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Agreen Agreen is offline
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Default Re: Help mounting thick tubing Trek Marlin 29er

Man that does suck. Every one of those billet adapters are either 1-1/8", 1-1/4", or 1-1/2".

I'd fabricate my own, but that may be out of your reach to do. I hope it all works out for you!
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  #18  
Old 10-25-2016, 10:59 PM
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ZipTie ZipTie is offline
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Default Re: Help mounting thick tubing Trek Marlin 29er

[QUOTE=Nanfoe;646364]The universal arrived today but it isn't going to fit this frame. I have a vitamin bottle that's a little bit less wide as my down post here for ref. I'm gonna take her to a place here localy and just let them do it. I'll craft on my other frames and just maintain this one when it's done. I'll post when she's ready.



would be very simple for any local machine shop to ream it out to the perfect frame size. They probably wont charge you more than 20 bucks to do it.
zip
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  #19  
Old 10-26-2016, 03:42 AM
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Default Re: Help mounting thick tubing Trek Marlin 29er

I am an ex airport worker from the late 90's, I had so many hook ups from machinists to pilots letting me fly jump seat but I have turned into a introvert over the years and kind of never kept up with anyone. Sucks to have it and then loose it. There's a few shops around my town, I'm gonna slap together another build there that just needs a back rim which I'll try to get tomorrow so I can ride and look. Can't have the wife drive me around all the time!

Edit: I think I'll take a ride to Home Depot and see their hardware I might be able to swing something with this piece of AL here.
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Last edited by Nanfoe; 10-26-2016 at 04:01 AM.
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  #20  
Old 10-26-2016, 04:29 AM
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Nanfoe Nanfoe is offline
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Default Re: Help mounting thick tubing Trek Marlin 29er

Oh and apologies here are the specs to the motor from BMW worked by Matt:

Balanced Bottom
Ported + Transfer Ports re-directed
Piston Modified for better gas flow
Cylinder Deck Lowered
6.0cc High Compression Head
15mm Intake Manifold (port-matched)
Heavy-Duty Aluminum Reinforced Exhaust Gasket
Copper-Coated, Port-Matched Intake Gasket
Bulldog Pipe (extra from Matt)
BH7 NGK
All hardware upgraded to grade 8.8
Running 16:1 87 octane

I will be adding in:

CNC Reed valve (align screws) with 20 mm Keihin clone
Rocket racing CDI
26 tooh sprocket

and a windowed piston I may try in the future.
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Last edited by Nanfoe; 10-26-2016 at 04:47 AM.
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