Recommend a carburetor for a 3.5 hp please

Loose Nut

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I have a 3.5 hp Horizontal shaft 4 stroke from a Sears lawn edger that I want to use, but the carburetor seems no good for use on a bike. Could you recommend a side draft carb?

Thank you
 
Changing from the stock carb on that engine will leave you with no govenor and risk engine damage. Those industrial engines don't like a lot of rpm with the stock rod.
 
On this page is a generic side draft carb from thats dax for $29.00 plus shipping.


http://thatsdax.com/ENGINE_KIT_PARTS_PAGE_1.html


His description
TITAN XC50
Carburetor
RUI124. Fits
Honda GXH50,
HS and more.
Comes with
Throttle Cable
stop and
adjuster,
Choke, Idle
screw, Slow
Jet
Adjustment
and more..
Only $29.99

You will have to adapt the mounting flange and the air cleaner

You will over wind it
 
Thanks Spad!

The stock carb does seem to have what would be an accelerator pump on a car. The current carb seems only suitable to run at a set speed.

How concerned should I really be about a govenor?

My cars don't have govenors and I haven't hurt them (yet)
 
These utility engines are designed to run in a narrow RPM range.
Obviously you can force them to run at any RPM you want to.
A car engine is designed to operate in a wide RPM range.
Obviously you can force it to run at any RPM you want to.
Try running either engine at an RPM range outside it's design and what will happen?
 
These utility engines are designed to run in a narrow RPM range.
Obviously you can force them to run at any RPM you want to.
A car engine is designed to operate in a wide RPM range.
Obviously you can force it to run at any RPM you want to.
Try running either engine at an RPM range outside it's design and what will happen?

Well said. I can't argue with any of that. I hope to putt around with this motor. If it goes up is smoke, then I'm out the $30 I have invested in the motor, and I can put a higher quality unit in it's place.

An engine is designed to operate at a certain RPM based on the cam profile, and the flow numbers for the carb/intake/head/exhaust. Then of course it's limited to what RPM parts fail at.

For a little project like this I can increase the flow of the carb and change the flow of the intake/head/exhaust, but not the cam. I'm not looking to make a hot rod out of a 3.5hp, but there seems to be some room to alter what RPM the peak horsepower is. Since I am changing the carb, and will need to make an intake and exaust, I mind as well clean up the ports a bit in the head.
 
keep in mind, the bursts should last for 5-15 seconds MAX. dont do it at all if you have a newer tecumseh, and the valves will float at 4000 on an older tecumseh
 
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