My bike up to now

This has been a project of mine for a couple of years now, it started out as a 66cc 2 stroke kit from bileberry on a 26" Chinese beach cruiser

I rode that bike for a little, but it never had functional brakes. Putting brakes on that bike wasn't going to be something that would be as simple as buying one part.

So, I figured if I was going to build a wheel for that bike I should get a different frame which is meant to have an engine on it.

So, over the next few months I got an in tank frame and a Springer fork (it was the wrong size, so I had to have a couple of spacers machines to take up the gap. Then I went to a bike shop and had them build a couple of wheels, the rear would use a hub which a sprocket could mount to it. The front wheel would have a Surly disc brake hub.

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• Just_Doin'_My_Own_Thing
• Nov 16, 2019

My completed 66cc 2 stroke bike-don't know the exact hp output but its good for about 40mph

Had...

Had a lot of fun with this setup, I found that a dual cable brake lever works pretty well

Finally, at some point, I decided to put a 49cc 4 stroke engine on it, which didn't take very long as the rest of the bike wouldn't need any modification. To get the bike to its current state.

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• Just_Doin'_My_Own_Thing
• Mar 3, 2020

My 49cc 4 stroke bike

Funnily enough the 4 stroke exhaust that came with it didn't fit, but the stock 2 stroke exhaust fits perfectly.

My future plans for this bike include building a custom exhaust similar to The phantom bikes Longshot exhaust, except with a thread on the end so I can have thread-on cigar muffler that is removable, then I will mess with the jetting. The only other thing I plan on doing is replacing the flywheel and coil with their Honda

If anyone has any questions about the specifics feel free to ask.

 

[Just_Doin'_My_Own_Thing]

Also, at one point the bike had a 2 bolt non Springer chain tensioner, and while riding it it twisted over jamming itself into the wheel breaking spokes, this required the wheel to be re-laced, now it has a 4 bolt spring chain tensioner, which I have had no problems with so far.

 

[Frogslayer]

How do the engines compare to each other? Will it still go 40 with the 4 stroke?

 

[Just_Doin'_My_Own_Thing]

How do the engines compare to each other? Will it still go 40 with the 4 stroke?

The main difference between the 2 and 4 stroke is that the 2 stroke made no power until like 10mph, then it started pulling like a freight train. The 4 strokes powerband is much smoother, it doesn't make as much power as the 2 stroke but the power of the 4 stroke is spread over a wider rpm range, so I can gradually feel the engine get until its powerband, its a lot subtler than the 2 stroke.

As far as top speed, the 4 stroke currently has the stock coil and flywheel, which from what I can research and feel has a rev-limiter, so the top speed for the time being is fixed. To midigate this I will install a honda gxh50 flywheel and coil.

I do believe with a few mods it will go 40, as this engine is completely stock and the 2 stroke is ported a fair bit. As I mentioned before, it will be getting a custom exhaust and I'll also mess with jetting.

But to get back to your question, no it will not go 40 in its current form.

 

[Just_Doin'_My_Own_Thing]

Looking into it, it looks like affordable go karts is one of the only places selling performance parts for these engines. Hopefully I can send my carb to them to get bored out. Also, I haven't found anyone who makes billet rods or performance cams oh well

 

[Chainlube]

If you port the head and get a free flow exhaust, you probably won't need the rod. Honda makes a pretty good as it is. With a bored carb you'll be zipping along.

 

[Tyler6357]

Nice looking bike!

 

[Just_Doin'_My_Own_Thing]

Nice looking bike!

Thanks

 

[Just_Doin'_My_Own_Thing]

If you port the head and get a free flow exhaust, you probably won't need the rod. Honda makes a pretty good as it is. With a bored carb you'll be zipping along.

Yeah, I'll definitely do those things, I guess it makes sense that the stock rod would be fine, as the Piston doesn't weigh all that much where as in a 212 or a 420cc engine the Piston has a relatively high amount of reciprocating mass

 

[Chainlube]

I've run a few Hondas at higher rpms and haven't broke one yet. The only thing I've added was a lightened flywheel and stronger valve springs. On my cyclecart I only turn the motor at 6500 rpm. I might port the head before the new season begins this year, you know, just for grins and giggles.