Briggs & Stratton 5HP 27mm Jieli

[DvotaktniKrkan]

Hello, im new to this forum, and 4 strokes. Know the basics, how it works, what can go wrong, how to tune it and port & polish shit. Know alot about 2 strokes and porting on them and about carbs.
My brother is convincing me that a 27mm Jieli carb is NOT needed on a 5HP, not even on a 8HP wich is on a buggy (you can see it here if you are interested, 600 hours of work, trial and error and finaly its here! max speed of 35km/h but insane power. https://www.youtube.com/watch?v=LK_E_ynYB2w)
I am building a Indian board tracker replica, 5HP Briggs, 24/26 inch bicycle wheels with wide dirt tires and a custom sheet metal tank.
Any help with the engine would be appreciated. Need to tune the valves, new membrain on stock on tank carb, i dont wana mess with that because i have a brand new one.

 

[CarPlayLB]

way too much carb! Remember, a smaller carb will keep intake velocity up, unless you are always running 9000RPM. Setting a land speed record...perfect!
A 20mm or 22mm would be fine. Too much carb and you have no low end power...and you need it down low to get you moving

 

[DvotaktniKrkan]

Crap... Now i have to tell my brother he was right. But on a 8 horse it would work ok right? So i have to get a 20mm carb, plan is not to go over 4800-5000. Want that engine to last. Clutch will be a belt drive to a drive shaft with a bicycle chain. Thanks on the fast reply!

 

[CarPlayLB]

20mm is good! ...and so is your English!:thumbsup:

The 8HP engines typically have very little aftermarket support...and yes, too much carb for the 8HP as well. Now pay up!

 

[DvotaktniKrkan]

Thanks, gonna try to give a little more for a real carb, not those 13$ knock offs that work 7 minutes and then melt/break. This Jieli i have is an original Japanese carb with a serial number. Anything 20mm will work, as long as its not from China. And im sorry but i have to ask again, would a 27mm carb work ok-ish on a 12.5hp block? I have a 8 hp block that cracked but it was fixed with JB weld i think thats how you call it, that grey liquid thingy that hardens and its like metal. All that block need are piston rings, a piston and a carb. The 8 horse that is on a buggy has a 12.5 carb on it and it works like a charm!

 

[CarPlayLB]

Sorry, I don't have any experience with the larger motors!

 

[DvotaktniKrkan]

Thanks for the help, this just proves i dont have a clue about 4 strokes. I quess they dont need so much carb because they dont have to draw the... the thingy gas/air mix stuff in the crank case then from transfer ports to the cylinder? Am i even close?

 

[DvotaktniKrkan]

This is the engine that is on a buggy, Suzuki Alto 1.0 alternator, Beverly 250 clutch, it works like a torque converter. And it has this thingy that makes it go in reverse.