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United States and many other countries | See details

Details about  Motorized bicycle high performance top end kit for GT-5 engine

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Motorized bicycle high performance top end kit for GT-5 engine
Item Ended
Item condition:
23 May, 2014 05:04:12 AEST
US $280.00
Approximately AU $395.15(including postage)
US $12.00 (approx. AU $16.93) Express Postage | See details
Item location:
Rindge, New Hampshire, United States


eBay item number:
Seller assumes all responsibility for this listing.
Last updated on  02 May, 2014 22:11:41 AEST  View all revisions

Item specifics

Condition: New  

Lots of goodies in this kit for a great price!

This kit is designed for the "GT-5" style engines which have a 38 mm stroke and FM-80 connecting rod.

The GT-5 "Skyhawk" motor is currently sold by Gasbike/Kings Motorbikes and possibly other vendors.

Take a look at the picture showing the connecting rods and pistons.

These are the key components to look at in order to determine what kind of engine you have.

Here what you get in this kit:

  • 6.0 cc center fire Fred Head w/nuts and washers (for 8 x 1.25 threads)
  • Precision machined, modified type B piston with rings.
  • Stage 2 cylinder body with CR Machine intake plenum, pre-fitted.
  • SHA clone carburetor with air filter, extra jets and throttle cable.
  • Wide wrist pin bearing, wrist pin and 2 clips.
  • High quality top and bottom gaskets.
  • High quality exhaust gasket.
  • Brass hex nuts for exhaust flange.
  • NGK B8HS spark plug

The cylinder body features widened intake and exhaust ports.

Modifications to the piston and cylinder body have been made to alter the port timing, resulting in more power.

The best results will be obtained when a unrestricted exhaust is used.

Normally, race fuel will not be necessary, unless the most optimal exhaust system is used.

In this case, it is possible that some race fuel will be necessary to keep detonation at bay.

Important note: The current GT-5 engines which use the FM-80 rod use 8 X 1.0 threads for the cylinder head studs.

The extra tall cylinder head nuts supplied with the kit will not fit this thread pitch, so you must use the original nuts that came with the engine.

Please read this important disclaimer:

I will provide the best technical support I can give, however there are no warranties for this engine kit.

This engine kit is designed for non road use,  and operating a motorized bicycle is inherently dangerous.

Because of this, the buyer is responsible for any damages or losses that may occur to themselves, others or property from the use of this engine kit.

Fred Chelminski or CR Machine will not and cannot be held liable for any kind of direct or indirect damage or loss that the use of this or other products may cause.

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