Has anyone Though about building a 80cc engine from a 40mm stroke engine? I saw a piston cylinder and rings with gaskets on ebay, 50mm bore that BGF says will work with a standard 66-69 cc head. If I had a 40mm stroke engine I would give it a try.
80CC upgrade piston and cylinder.
- Thread starter Greg58
- Start date
Would this work? ...........Curt
www.californiamotorbikes.com
80cc Wildcat Bottom End | website
Trued crank with 38mm rod. Uses Wildcat cylinder and "low pin" Wildcat piston.
I know I built a 70cc from this Athena cylinder kit with a spacer from smolik performance 
Spacer 40mm or 38mm
smolikperformance.com
My build
motorbicycling.com
Butttt my build 70cc where did u find the 50mm bore can u give me a model name and link please
Amazon.com: Athena (070200) 47.6mm Diameter Aluminum 70cc Sport Cylinder Kit: Automotive
Buy Athena (070200) 47.6mm Diameter Aluminum 70cc Sport Cylinder Kit: Cylinder Heads - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com
Spacer 40mm or 38mm
Minarelli Vertical Long Rod Spacer
This includes a billet spacer plate in order to adapt a Minarelli AC style cylinder onto a stock long rod bottom end. IMPORTANT: set your squish properly .8-1mm. Choose your crank stroke 38mm or 40mm.
smolikperformance.com
My build
Athena minatellie vertical on bicycle
This my bicycle I been working on, if you like hit the like button
motorbicycling.com
Butttt my build 70cc where did u find the 50mm bore can u give me a model name and link please
Here it is.
BT100 100cc IRON sleeve cylinder turn 2-stroke 80cc to 100c motor bike engine 49 | eBay
This cylinder is upgrade 80cc into 100cc ( only for long connecting rod bottom end). 1 of 100cc steel sleeve cylinder (#BT100) ( 40mm intake not include, need buy separated ). use original 80cc head is ok.
www.ebay.com
My 66cc engine has 38mm stroke, the kit is for 40mm stroke engines, this may be a better way to get a 50mm bore engine to perform. With the heads available and the ability to adjust squish this shows promise.
That requires a bottom end with a long connecting rod.Here it is.
BT100 100cc IRON sleeve cylinder turn 2-stroke 80cc to 100c motor bike engine 49 | eBay
This cylinder is upgrade 80cc into 100cc ( only for long connecting rod bottom end). 1 of 100cc steel sleeve cylinder (#BT100) ( 40mm intake not include, need buy separated ). use original 80cc head is ok.www.ebay.com
If your engine uses the piston with the high pin location this kit will work.
Any of the bikeberry racing has long rod btw
www.bikeberry.com
BBR Tuning Racing Series Stage 2 66/80cc 2-Stroke Engine Kit
The BBR Tuning Stage 2 Motor Bicycle Engine Kit with superior quality gives you increased power, higher speed, smoother and more consistent ride than ever.
www.bikeberry.com
