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Author Topic: ST 35 Combat's sleeve orientation  (Read 171 times)

Offline kevin king

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ST 35 Combat's sleeve orientation
« on: June 29, 2025, 09:46:04 PM »
Anyone know the correct way to reinstall the sleeve on a ST 35 Combat engine? One side of the sleeve has 2 windows, the opposite side has one big window. When viewed from the engine case exhaust port. Thank you.

Kevin

Online Massimo Rimoldi

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Re: ST 35 Combat's sleeve orientation
« Reply #1 on: Yesterday at 12:02:13 AM »
Hello.
In all 2S engines the highest window is the exhaust one, the lowest one (or ones) is the transfer window.
In your case the single window is the exhaust, the two coupled ones are the transfer ports.

Massimo
« Last Edit: Yesterday at 06:02:40 AM by Massimo Rimoldi »

Offline kevin king

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Re: ST 35 Combat's sleeve orientation
« Reply #2 on: Yesterday at 05:26:38 AM »
Thanks Massimo! H^^

Offline Paul Smith

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Re: ST 35 Combat's sleeve orientation
« Reply #3 on: Yesterday at 06:22:48 AM »
Very true. 
In all 2-stroke engines it is necessary to allow the hot compressed exhaust to leave the combustion chamber before the cool low pressure incoming charge can enter. 
Paul Smith

Offline Motorman

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Re: ST 35 Combat's sleeve orientation
« Reply #4 on: Yesterday at 07:54:47 AM »
 I seem to recall ST made some sleeves where the exhaust and transfer opened at the same time. The one big window is the exhaust and the two angled windows are the transfer ports. Make sure you get the conrod with the chamfered side forward. The cut out in the back plate goes on the transfer side.

MM :)
Wasted words ain't never been heard. Alman Brothers

Online Massimo Rimoldi

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Re: ST 35 Combat's sleeve orientation
« Reply #5 on: Yesterday at 09:13:53 AM »
I seem to recall ST made some sleeves where the exhaust and transfer opened at the same time. The one big window is the exhaust and the two angled windows are the transfer ports. Make sure you get the conrod with the chamfered side forward. The cut out in the back plate goes on the transfer side.

MM :)

What you are talking about is the "Supertigre Transfer Ports" (Travasi SuperTigre) configuration which is the case with Kevin's sleeve.
Even in this case there is a small difference between the exhaust opening and the transfer ports, a few degrees but they are there. The engine MUST start unloading before putting fresh charge into the cylinder.

Massimo

Offline Howard Rush

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Re: ST 35 Combat's sleeve orientation
« Reply #6 on: Yesterday at 11:04:16 AM »
The side with the angled cut is the bypass side, opposite the exhaust.
The Jive Combat Team
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