![]() Unless otherwise agreed in advance we don't and cannot guarantee delivery times whatsoever. Please allow around 5 day's delivery time from the date of dispatch. If there are any items that are not in stock we will notify you as soon as we can via the Email address you have given us. We aim to process your order within 48 hours of us receiving it (Monday to Friday) process means pick and pack your order and get is posted out. ![]() Piston at TDC Total volume combustion chamber including spark plug hole measured on the engine 11.50cc Squish achieved using 1.50mm thick solder 0.70mm For this reason it is imperative that you measure the squish clearance before running the engine. Now 0.70mm is too tight BUT you can run a 0.50mm Base gasket and get 0.90mm, We have done this to give you some choices and the ability to set the squish are your required setting.Īs we are getting close to the optimal squish consideration is needed, the whole reason why Rotax built in such a big squish is due to manufacture tolerances of all the components such as, the length of the conrod, the deck height of the piston, the crankcase height and the deck height of the cylinder ETC. We have designed it to sit into the cylinder bore to achieve the squish of around 0.70 mm with a 0.30mm Thick Base Gasket. This head solves the issue of getting the cylinder machined. Skimming the cylinder face is possible, but you also have to machine the O-ring grove back in AND also the outer part of the water jacket needs to be skimmed the same amount to keep the seal round the spark plug O-Ring. To get anything under 1.45mm you will need to get the top of the cylinder machined as the piston simply does not come far enough up the bore, with me so far? There is a slight lip to the cylinder head of around 0.25 mm so if you skim the head face by 0.25 you will get around 1.45mm of squish, still not close to the ideal 0.80-1.00mm. With the Aprilia RS125 getting the squish down below around 1.7mm is not possible without machining the cylinder head OR the top face of the cylinder. PLEASE NOTE THIS IS NOT PLUG AND PLAY You will need some experience in measuring understanding the of setting squish to fit and use this head. Aprilia RS 125 Billet Cylinder Head Made To PJME Specifications To Obtain 0.70mm Squish.
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