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4 Stroke Bicycle Engines & Kits 4 stroke engine kits are great if you want reliability or do not want to mix your oil and gas. Learn from each other how to get the most out of your 4 stroke bicycle engine

View Poll Results: Which of the three 4-strokes would you go for if looking for a 4-stroke conversion?
Honda GX35 OHC 1 6.25%
Honda GHX50 OHV 4 25.00%
Briggs 5hp Model 13 flatty 11 68.75%
Voters: 16. You may not vote on this poll

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  #1  
Old 04-10-2016, 03:43 AM
jmason92 jmason92 is offline
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Default Just a little battle of the 4-strokes, or OHC vs. OHV vs. flatty

So, just for fun, I'm posting a little battle of the 4-strokes poll, the three valve arrangements duking it out are OHC, OHV, and flatty/sidevalve.
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Old 04-12-2016, 09:12 AM
916Tim 916Tim is offline
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Default Re: Just a little battle of the 4-strokes, or OHC vs. OHV vs. flatty

I've got the little HS 38cc OHC on a friction drive im in the process of building. We'll see how she does..
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Old 11-19-2016, 08:01 AM
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WECSOG WECSOG is offline
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Default Re: Just a little battle of the 4-strokes, or OHC vs. OHV vs. flatty

Flat is where it's at! Especially for a rat bike build.
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Old 11-21-2016, 05:40 PM
mat_man mat_man is online now
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Default Re: Just a little battle of the 4-strokes, or OHC vs. OHV vs. flatty

Lifan 152-f 97cc Flathead (Honda g100 clone)
https://www.youtube.com/watch?v=ZsNn_emmv88

Not much larger than Honda 49cc OHV.
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Old 11-21-2016, 06:02 PM
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scratchbuilder scratchbuilder is offline
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Default Re: Just a little battle of the 4-strokes, or OHC vs. OHV vs. flatty

5horse Briggs...if you drove each one...the Briggs would ' Trump' em.
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Old 11-21-2016, 07:18 PM
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culvercityclassic culvercityclassic is online now
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Default

I have built them all, just love the look and history of a Briggs Flathead.
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Old 11-22-2016, 11:31 PM
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Gbrebes Gbrebes is offline
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Default Re: Just a little battle of the 4-strokes, or OHC vs. OHV vs. flatty

Hello All,


I feel that I must weigh in, given I have used all three engine designs on my motorized bicycle.

First, I used a 5hp Briggs. I loved the vintage feel and the ability to build more hp, but I found that for stop and go traffic, which I find myself in, the Briggs would tend to smoke and also overheat.

Second, I used a Honda GC190. This engine is an OHC design. I loved this engine with its upright mounting orientation, but this motor did not love me. I busted about 4 to 5 of these engines, snapped valves, slipped timing belt, stripped timing belt pulley on crankshaft, and finally a thrown connecting rod. It was good while it lasted.

Third, I have recently installed a predator 212cc harbor freight engine, OHV design. This engine is THE ONE as far as I am concerned. I have not logged a whole bunch of miles yet, but what I have experience so far is more usable (low end) power, more robust and less prone to failure, and overall more reliable power plant.

I love them flatheads, but my heart says I have to vote for OHV with the Predator 212cc engine.

For what its worth,

Gilbert
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