Backpressure for 4 strokes

jeffreykogan

Member
Mar 1, 2021
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Hi, I have a 79cc predator (which is a 4 stroke) and I was wondering if having a bit of backpressure from a muffler would make it run better. I currently have it straight piped, should I switch it out for a different exhaust?
 
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Reactions: Tom from Rubicon

Venice Motor Bikes

Custom Builder / Dealer/Los Angeles
Mar 20, 2008
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Los Angeles, CA.
A little back pressure is good for low end power; but having less back pressure helps the top end power.

I prefer less back pressure on all my 4-strokes... You can really help the low end power by actually pedaling the bike at low speed. ;)

Another thing to consider is that when you add a straight pipe (& or a better air filter), you will also need to increase the jet size!