Buying one of these this payday

[Randall]

https://bicyclemotorworks.com/product/mid-level-red-66cc-racing-bike-engine/

 

[Steve Best]

Site is down

 

[zippinaround]

Mid-Level Includes:
66cc Race-Ready GT5 Engine
Billet Aluminum High-Compression Head (6cc combustion chamber)
Port-Matched Billet Straight-Shot Intake Manifold
Ported cylinder for advanced timing
Piston ramped at the exhaust & skirt trimmed at intake.
NGK High-Performance Spark Plug
NGK Water-Proof Spark Plug Boot
12+” of 7mm copper-core wire
1 Racing Carburetor (with 6 total jets)
1 longer-pull throttle cable
Studs in cylinder replaced with grade 8.8 studs & hardware.
This is the engine only, no kit included. Please select KIT UPGRADE for the full kit.
Select KIT UPGRADE. Includes: Throttle, Exhaust, Mounting hardware, #415 Heavy Duty Chain...

$309.99

 

[Neptunati]

Get a GT80 Bro. Much better engine imo. Plus the reeds give you gobs of low end torque.

 

[Deleted member 12676]

they should pay you for taking that monstrosity off their hands.
The head should have 7.5cc, not 6cc. Compression will be too high causing the cylinder plating to flake off. And it will wear out the bearings. When you make a big increase in compression you have to retard the ignition which prevents excessive combustion pressure.

People are duped so easy.
P.T.Barnum said "there's a sucker born every minute".

Most of the MB aftermarket industry is based on the ability to sucker people. If I said this on the other forum I'd get kicked off. At least I can tell the truth here but I find I'm a lone voice crying in the wilderness.

 

[Demo_Ricky-Bobby]

they should pay you for taking that monstrosity off their hands.
The head should have 7.5cc, not 6cc. Compression will be too high causing the cylinder plating to flake off. And it will wear out the bearings. When you make a big increase in compression you have to retard the ignition which prevents excessive combustion pressure.

People are duped so easy.
P.T.Barnum said "there's a sucker born every minute".

Most of the MB aftermarket industry is based on the ability to sucker people. If I said this on the other forum I'd get kicked off. At least I can tell the truth here but I find I'm a lone voice crying in the wilderness.

No i pretty mich agree with u
Alot of people get suckered in to buying sh!t they dont need and most of the time its all beauty and no proformance

 

[Deleted member 12676]

Having a squish band is a selling point but it's near impossible to design the head to only give 130psi while there is a squish band taking up space. According to Jennings they aren't needed anyway for engines that rev less than 9000 or that don't have high compression. And if the buyer doesn't adjust things so that the squish clearance is around .6mm then they actually decrease performance compared to a head with the same psi and no squish band. Since there's always too much space there and since no one goes to the trouble to adjust it then the heads should not be designed with a squish band.

 

[FurryOnTheInside]

I sort of agree, except for the point that it is advertised as a race engine and the vendor specifically states that it is not intended for street use. They don't claim it's good for commuting or long distance touring.
Okay so the chrome will flake off but the cylinders are cheap disposable items, only modified with a bit of porting, and bottom ends are totally stock as far as I can see, just a bit of fancy paint.
In a race situation, who cares about longevity? It only needs to last until the chequered flag.

 

[Deleted member 12676]

I highly doubt that buyers of that engine would agree with you.
If the seller told the truth of the problems that the high compression head would cause I doubt anyone would buy it.

 

[FurryOnTheInside]

I highly doubt that buyers of that engine would agree with you.
If the seller told the truth of the problems that the high compression head would cause I doubt anyone would buy it.

I think you credit people with too much intelligence and foresight!