Most HP on Built Clone with Pump Gas

[E85TunedGX200]

How much power are some of you guys making on a modified clone motor tuned on pump gas (ex: 91-93 octane)? Anyone in the 20-25HP range?

 

[minidragbike]

I just built one that should make 25hp, pull start, and run on 91 pump gas.

My other .080" motor makes about 20hp, and it also pull starts, and runs on 91 octane pump gas. Both motors are around 10.1 static compression.

 

[E85TunedGX200]

Hey Charles,

It was good talking to you yesterday. Could you put together a parts list of what I'll need to make 20HP. I'll have you do the assembly. Thanks.

 

[minidragbike]

28.5mm/25m big valve head stock chamber head milled .050"
1" bore carb, tillotson, or 26mm mikuni
.310" Isky cam
Flat Top standard piston
HD chromoly push rods
ARC 3.323" rod
ARC flywheel, or even better Raceseng 1.8 pound flywheel
gx160 head gasket

 

[suprf1y]

Why the GX160 head gasket?

 

[minidragbike]

Why the GX160 head gasket?

Seals up easier, worse thing is putting your motor together only to blow the head gasket.

 

[Oldschool]

I think its important to remember that there is no free ride.

An engine that makes more power will have a shorter life than a weaker one.

The quest to make more power makes for engines that are peakier and less user friendly. The range where this power comes on is higher up in the rpm range is what I am saying.

YES you can make a lot of power on gas or methanol but is it power you can use?
Drag bike and fun bike are not the same thing.

A bigger engine might make more sence in some cases.

 

[Oldschool]

Upon further reflection what I am trying to say is....

You don't swat flies with a sledge hammer

 

[saychz316]

28.5mm/25m big valve head stock chamber head milled .050"
1" bore carb, tillotson, or 26mm mikuni
.310" Isky cam
Flat Top standard piston
HD chromoly push rods
ARC 3.323" rod
ARC flywheel, or even better Raceseng 1.8 pound flywheel
gx160 head gasket

what ratio rockers?

is that the billet isky cam, or a reground stocker thats been welded?

this looks like a good combo :thumbsup:

 

[minidragbike]

what ratio rockers?

is that the billet isky cam, or a reground stocker thats been welded?

this looks like a good combo :thumbsup:

The Champion rockers are stock ratio. I just changed the cam in my gasser to a .370" cam. It has picked up even more TQ and HP. It still pull starts easy, and runs all day long.

Yes welded regrind stock cam.

 

[Peyote_Pete]

what timing are you using for that gasser mdb?



pedro

 

[jprice]

Seals up easier, worse thing is putting your motor together only to blow the head gasket.

doesn't that defeat the purpose of of milling the head?

 

[Karterdan]

doesn't that defeat the purpose of of milling the head?

The milling of the head, compensates for the use of a thicker head gasket & still adds some extra compression.
GX160 gaskets are one of the best for stock bore engines in my opinion.

Dan

 

[Neck]

Upon further reflection what I am trying to say is....
You don't swat flies with a sledge hammer

Well.......you do if your playing Hammer Fly! It's a drinking game.

 

[graygoose420]

I have a mild built 6.5 champion . Makes about 14/15 HP . Running 91 regular gas from the gas station. I've beaten some alky bikes with it already.

 

[Karterdan]

All of our Honda Opens run on gas.

Here is a video of our current open running at 8400rpm's - YouTube - ‪Tuned Honda GX200 Karting - Ryehouse kart circuit - 19.03.11‬‏

We have a new engine in the build which you may of heard about 'Europes Fastest GX200' which will also be ran on gas.

I'll post some videos once it's built.

Thanks,
Dan
GX200 Tuning Store UK

 

[Oldschool]

I have a mild built 6.5 champion . Makes about 14/15 HP . Running 91 regular gas from the gas station. I've beaten some alky bikes with it already.

Are running a 14cc head with FT piston?

 

[graygoose420]

Are running a 14cc head with FT piston?

Mild Gx200 head. With Honda FT . Stock bore stock stroke .

 

[proturbo]

The Champion rockers are stock ratio. I just changed the cam in my gasser to a .370" cam. It has picked up even more TQ and HP. It still pull starts easy, and runs all day long.

Yes welded regrind stock cam.

Will a bigger cam kill your low end?I have a mod 6.5 clone with a 14cc head mill 80 thousand but small stainless valves.It has a NR-252-0607 cam thats good to 7000 rpm and will go to 7100rpm and no more.I race 1/8 mile and its running out of rpm about 30 yards before the finish line,I dont want to change the gearing because I like the take off.How much bigger can I go in a cam with small valves and should I go with a short or small circle track cam that is good for more higher RPM ,because was told that they have good low end tork to or just a bigger cam with more lift and duration:shrug: