1989 3PG Muffler Fabrication

[RxGuy]

Hi all,

Does anyone know of a muffler that can be modded/fabricated as a replacement for the 1989 3PG muffler?

Going to BBQ the old one, but I am afraid it might be the end of the line for it.

It's unreal what the Muffler Mafia wants for a replacement!!!

Thanks

Blair

[TheGDFP]

A chambered auto/truck muffler seems a decent choice, if able/willing to fabricate.

[my1423]

New here been reading a lot to upgrade my 85 pg2 that i just bought.


My muffler needs a bbq.
Not really happy with the 9hp rating.
Upgraded my carb to an 88 and read the 88 pipe will give 11 hp range.
Pretty low spec and really expensive pipe.

I have been wondering about modding and using a used 125 bike expansion chamber and silencer.
Look to be similar in exhaust port size and final output restriction.
Most 125 bikes make 30 and up hp at the 5-7000 rpm range.
35-40 7-9000 prm.
Dogs in the 2-5 range.
Cheap used 125 pipe might need a 1/4 1/2 primary cone shortening to move the power band down to the 3-5000 rpm range and keep scavenging in ratio at those rpms.

Anyone ever try one of these mods?
Not seen much other then not really worth it and a few attempts at using a 250 pipe. This will be to large due to the rpm and flow differences.

Think a 125 pipe might be just about right.
80 pipe might work for low end band but those are a little more rare to find junked out for cheap.
Those can make in the 20hp range but rev to the moon.

[TheGDFP]

250 Polaris utility ATV pipe is not bad. Power on the stock utility ones is about right.

[my1423]

Have you done this mod?

I would think the rpm range is off.
Did Polaris make a 125? You have a chart for them?
Half the rpm half the flow since the carts need power in the 2-5 range.
Our engines will never reach those high power ratings or rpm of a 250.

[TheGDFP]

22hp@5300 should be just what it needs.
125cc 2-stroke ATV's are uncommon. Yamaha had a tripod in the early 80's