18% More Power for Huasheng 142F with Exhaust

[Deleted Member 4613]

This has been covered before but according to EZM, it results in an 18%
improvement in power of the 142F, which was confirmed on a dyno. A simple
flexible exhaust that is 28.5 inches long, and 7/8 inch ID is required.
The exhaust creates the sound of a real motorcycle, not too loud
but pleasing. Here's what it sounds like:

 

[zean]

I remember back in the day a couple of reputable builders said they could achieve 50mph with the 142F on a stable bicycle after some basic exhaust and carb adjustments, quite a few members at the time expressed doubt. There was also a re-worked cam available.

 

[Sidewinder Jerry]

This has been covered before but according to EZM, it results in an 18%
improvement in power of the 142F, which was confirmed on a dyno. A simple
flexible exhaust that is 28.5 inches long, and 7/8 inch ID is required.
The exhaust creates the sound of a real motorcycle, not too loud
but pleasing. Here's what it sounds like:

Is there more links and information on this?

 

[Deleted Member 4613]

Yes, look on the second page of the following link,
a posting by Quenton, the designer of the EZM q-matic
belt transmission:

The ultimate Huasheng 49cc 4-stroke exhaust!

Looks Good. Some day I would like to build a similar type exhaust using 3/4" bendable copper tubing.

motoredbikes.com

 

[Deleted Member 4613]

Check this guy out. Using a q-matic and the 7/8 inch
exhaust, he did 45mph. Sounds great!

Who needs a 2 stroke?!

 

[Deleted Member 4613]

A better look at this guy's MB with the q-matic:

 

[Sidewinder Jerry]

A better look at this guy's MB with the q-matic:

One has to wonder if this kind of exhaust system would improve the the performance of the Robin Subaru 35??? An 18% increase on the RS35 would move it from 1.6 hp to 1.888 hp.

 

[Deleted Member 4613]

There's a way to find out if you're willing to spend some money.
Buy two pieces of flexible tubing about 30 inches long.
Install one on the RS 35 and record the speed up the hill in your video.
Cut the tube by 3 inches and record the speed again.
Keep cutting the tube by three inches and recording the speed up the hill.
Eventually, you find out what length gives the max speed up the hill.
You may have to adjust the fuel/air mixture on each run.
When you have the fastest speed up the hill, you'll know the right length.
And you can make a final cut on the second tube.
It's a great experiment that will reveal how to power up the RS35.

 

[Sidewinder Jerry]

There's a way to find out if you're willing to spend some money.
Buy two pieces of flexible tubing about 30 inches long.
Install one on the RS 35 and record the speed up the hill in your video.
Cut the tube by 3 inches and record the speed again.
Keep cutting the tube by three inches and recording the speed up the hill.
Eventually, you find out what length gives the max speed up the hill.
You may have to adjust the fuel/air mixture on each run.
When you have the fastest speed up the hill, you'll know the right length.
And you can make a final cut on the second tube.
It's a great experiment that will reveal how to power up the RS35.

I'm hoping to use a less expensive way; I've messaged Quenton about it. Since he's got better equipment to do such things. However, if Quenton doesn't want to do it I could try your suggestion.

 

[zean]

Back in the day one member wrote that he would run a line of hi-temp grease across the length of the flexible exhaust, ride the bike for @15 minutes then cut off the portion of exhaust at the point where the grease stopped melting.