Best mods for a 4 stroke

[Andrew1234]

I’ve been thinking about a 4 stroke build and wondered if a homemade full straight pipe exhaust system will help with performance and if there are any other mods I can do

 

[DieselTech]

I’ve been thinking about a 4 stroke build and wondered if a homemade full straight pipe exhaust system will help with performance and if there are any other mods I can do

Depends on which 4 stroke you purchase, but there are many mods to do. Free flowing exhaust, milled head, higher compression, bigger camshaft. Many many mods, but we need more specific information. Here is my 49cc 142f hausheng 4 stroke, it's got a 7/8" stainless straight pipe, & a dellorto 15.15 carb.

 

[Andrew1234]

Depends on which 4 stroke you purchase, but there are many mods to do. Free flowing exhaust, milled head, higher compression, bigger camshaft. Many many mods, but we need more specific information. Here is my 49cc 142f hausheng 4 stroke, it's got a 7/8" stainless straight pipe, & a dellorto 15.15 carb. View attachment 187026

i wanna get just a generic ebay 4 stroke kit

 

[JuraTyKokotko]

Depends on which 4 stroke you purchase, but there are many mods to do. Free flowing exhaust, milled head, higher compression, bigger camshaft. Many many mods, but we need more specific information. Here is my 49cc 142f hausheng 4 stroke, it's got a 7/8" stainless straight pipe, & a dellorto 15.15 carb.

View attachment 187026

What jet do u have in the dellorto? Could i get a link for the exhaust? Thanks

 

[DieselTech]

What jet do u have in the dellorto? Could i get a link for the exhaust? Thanks

The exhaust pipe I built from scratch, its 7/8" stainless steel tubing & i used a $150 Amazon tubing bender to fabricate it. On the dellorto 15.15 carb @ 1000ft elevation, i run a jetting from 73-75 on my hausheng 142f 4 stroke engine. I'm currently running a 74 jet & it's a touch rich on fuel.

 

[Andrew1234]

The exhaust pipe I built from scratch, its 7/8" stainless steel tubing & i used a $150 Amazon tubing bender to fabricate it. On the dellorto 15.15 carb @ 1000ft elevation, i run a jetting from 73-75 on my hausheng 142f 4 stroke engine. I'm currently running a 74 jet & it's a touch rich on fuel.

about how much power did a straight pipe add?

 

[DieselTech]

about how much power did a straight pipe add?

Enough to know it, by the seat of the pants dyno. Yes it helped with power, but exhaust pipe needs a snubber/restricter plate inside pipe if you want more torque.

 

[Chainlube]

Enough to know it, by the seat of the pants dyno. Yes it helped with power, but exhaust pipe needs a snubber/restricter plate inside pipe if you want more torque.

What about a hot dog on the end?

 

[DieselTech]

What about a hot dog on the end?

Yeah a briggs hot dog muffler would be perfect for the back pressure needed. I always 4get about the briggs hot dog muffler.

 

[Sidewinder Jerry]

Shifting systems can also increase performance. The most important thing that should be considered is frame/wheel strength and Stopping power. Safety should always take priority over speed.