flipped jug on Chinese 2 stroke engine

[butre]

it can be done, and it was even easy.

I don't notice any performance changes that can't be attributed to shortening the exhaust header (power band shifted). I just did a little bit of port matching on the crankcase, modified the stock intake manifold and my noisy expansion pipe. total investment was under $4

it runs just as good as before the modification and it looks different from all the other Chinese kits on beach cruisers you see.

here's a link to a picture, I don't know how to make it smaller from my cell phone

http://imgkk.com/i/wj0e.jpg

 

[butre]

one side effect is more ground clearance. I'm not smacking my pipe on the nearby speed bump anymore. I'm totally satisfied with this mod on that merit alone.

 

[butre]

Temps (at least in the area around the engine) are noticeably higher with the hottest part of the engine out of direct airflow. I might finally buy that cr machine head Fabian has been championing.

I've also pressed my leg against the exhaust twice now, so I'm buying fiberglass wrap tomorrow. I've got a major vacuum leak to sort out as well. I have one place I hope to find it on the intake, and one place I hope to god isn't it on the crankcase. if I'm lucky sorting out the vacuum leak might solve the temperature problems since I won't be idling at a million rpm

 

[MotorBicycleRacing]

#33 Bairdco has made many flipped motors going back years.

 

[butre]

that's a huge pipe on there, makes the whole thing look pretty impressive.

Now that I know it works, it's time to try a new carb. I'm thinking one of those PZ19 carbs from eBay, since I haven't seen one on a motorized bike yet. the thing should be good and quick when I'm done with it

 

[Deleted member 12676]

you have my intake mod for low rpm power but you are using an expansion chamber without any header which makes it a high rpm pipe only. Put a header on it if you want to boost low rpm power.

 

[butre]

I plan on doing that, the hardware store didn't have any appropriately sized pipe other than ridiculous 20 foot pieces so I just used the bits of the expansion pipe I had left until I can get something suitable.

the intake mod was done more out of necessity than anything else, but I think I like it.

 

[Deleted member 12676]

I think Home Depot may have some pipe that would be appropriate

 

[HeadSmess]

scrapyards have the stuff just lying around and usually just say "take what you want" when dealing with boring old ferrous materials...

 

[keatonx]

Butre I'm assuming you aren't using your rear rim brakes like that lol