ESP "New Generation High Rev" 28.5cc/29.5cc Championship Ported Zenoah 4-Bolt Kit

ESP "New Generation High Rev" 28.5cc/29.5cc Championship Ported Zenoah 4-Bolt Kit

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THEY'RE HERE!

The new Zen G290, 36mm bore 4-bolt cylinders are the most reliable 36mm bore that we can now use, and ESP was eager to add their Championship winning porting and head work.

These kits are the newest and most powerful of the ESP Porting, the "New Generation High Torque" Kits.

We (the hobby industry) asked Husky/Zen for a 36mm top end, they saw the need and came through, but they surprised us by making them 4-bolts.

Now we can work on making even more power, without the worry of breaking a cylinder off or the possibility of a premature plating failure (so you know your money wont just--flake away). I think you can expect a lot of fast engines being made from this top end - Doug @ ESP

The 4-bolt cylinders (G270/G290) right now have enough squish clearance to install a 1mm stroke crank with no head mods or cylinder gasket stacking (use one stock gasket), but that can change in the future, because the 2-bolt Zen G260 used to be the same way (now have tighter squish stock).

Here is the crank configuration ESP recommends with their ported and head modified 4-bolt head kits.

G270/G290-- No head mods (ESP ported, but squish band and combustion chamber left stock). Use either stock stroke crank, or 1mm stroke crank with no other changes. 1mm crank gives a noticeable mid range gain, but may lose a few hundred RPM (typically).

G270 (27.2cc)/G290(30.5cc)--ESP ported, and has head mods performed (squish and combustion chamber cut to accept 2mm crank).

This is choice for the 30.5cc engine.

More 'hole shot' or 'corner to corner' low and mid range than the 1mm and stock crank, but typically, the 2mm cranks are not known for making screaming piston port engines, but usually have enough power to gear high, if top speed is what your looking for.

These big-bore kits have been 'ESP Championship ported' - intake, exhaust, and transfer ports have been enlarged/reshaped for more fuel/air flow and hence more power.

This is the long-anticipated 4-bolt Zenoah 36mm 29cc bigbore kit! This kit will fit Zenoah G240RC/G270RC engines, or any engine running the 4-bolt Zenoah cases. This includes the parts shown (piston, cylinder, ring, spark plug, base gasket, c-clips, pin)

This 36mm cylinder is for use with the standard 28mm crankshaft.

This is a championship ported version of Zenoah part # 966508401.

 

Please Note: These Head Kits are All based around Genuine Zenoah heads, and are Approximately 37.87mm, If you are using KM bottom ends, they must be the Original E001 4 Bolt cases which are Approx 37.97mm.

Also Compatible with: 67050

Colour: Grey

Position: Centre

Compatible Engine: Zenoah G240, Zenoah G270, Zenoah G290RC, KM 29cc, KM 30.5cc,