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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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  #21  
Old 10-26-2016, 09:13 AM
curtisfox curtisfox is offline
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Default Re: Help mounting thick tubing Trek Marlin 29er

You may get it reamed out at a auto parts store that does machine work, most have reamers of all sorts, The space were the bolts go through should not be tight together, as to lose the clamp pressure................Curt
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  #22  
Old 10-28-2016, 07:01 PM
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Nanfoe Nanfoe is offline
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Default Re: Help mounting thick tubing Trek Marlin 29er

Went yesterday and had engine mounted, rode 30 miles home with just the chain popping off once. Today I notice no washers or lock washers on rear stud mounts and the nuts where loose. I tried to add washers then re tighten when a stud tip snapped. The front mount hardware studs are up-sized from stock is there a way to do the same for the rear?
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  #23  
Old 11-02-2016, 08:12 PM
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Nanfoe Nanfoe is offline
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Default Re: Help mounting thick tubing Trek Marlin 29er

Update: I'm riding in the first lean mix since break in and she started 4 stroking. Went down the line from #70 to settle with #61 which is the smallest I have. She was still 4 stroking and plug check showed too rich. I removed the air-filter and bam like night to day no more 4 stroking. I bought some new plugs b8hs and a 7. I slapped the new 8 in there pre gaped, rode her and she sounded like she was going to 4 stroke for a spit second the stopped. I checked the plug it looks OK to me, how does it look to you all? She seems to run good with my WOT which from the filter side looks like 7/8 OT. I need a different throttle cable it's just rigged for now. She's doing 40 MPH @5500 rpm, what a lucky guess. I bought a fuel filler hose which was the wrong size for this Reed/Carb setup. Anyone know what size this hose should be? I was told 1 in ID and that's way too big.

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Last edited by Nanfoe; 11-02-2016 at 08:16 PM.
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  #24  
Old 02-21-2017, 10:49 PM
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Nanfoe Nanfoe is offline
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Default Re: Help mounting thick tubing Trek Marlin 29er

Went ahead and made a plate with a hack saw and drill, bought some muffler clamps and now all is good. Built my first engine from new parts except carb and did a pressure test and she did 173 psi. I'm using 4 oz per gal Opti oil do I need to add more for break in? I'm just put putting around at idle to almost 1/4 throttle. She needs tuning bad, but later when she's set.
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