Hop Ups

[45u]

Does anyone make hop up parts for the 4 cycle motors? My third build is going to be a 4 cycle.
Thanks
Jeff

 

[rhenning]

Which 4 cycle?? There are a lot of different 4 strokes out there. Roger

 

[45u]

Which 4 cycle?? There are a lot of different 4 strokes out there. Roger

49cc Gurbee
https://www.motorizedbicycle.com/bi...lt-drive-complete-gas-powered-engine-kit.html

 

[HeadSmess]

http://www.ebay.com.au/itm/GT15-T15...239999?hash=item280cd900ff:g:8tkAAOSwKrhVbRrL

swear i have seen smaller ones...

not much. bit of port work, can you reprofile cams, given that they use a single lobe cam? um...

the 142f or whatever it is, isnt easily modified...looks like a huasheng, at least.
cant raise compression ratios, cant do this, cant do that...

EFI...

modified exhaust...

they go pretty good stock anyway. much more torque than the 2 stroke kits.

better off sticking with a twostroke and using a chainsaw engine...

 

[Frankfort MB's]

Could you do some port work on the intake valves and exhaust valves?

 

[chainmaker]

Get a HF79 at least you can do some basic stuff to it, it's so small could easily pass as 49cc

 

[Nanonevol]

Here's a company with fuel injection and turbos for small engines:
http://www.ecotrons.com/products/small_engine_fuel_injection_kit/

 

[Frankfort MB's]

Awe how cute

 

[45u]

So what most are saying that the 4 cycle does not have anywhere near the up grades the 2 cycles do.
Thanks
Jeff

 

[Old Bob]

None to speak of, small market and not enough sales to support it. They wouldn't pay $35 for a high output cam for a Honda GX series engine and there were liability issues. So it was dropped.