CubBoy125 said: (quoted from post at 20:41:32 11/11/12)
You know that is a good question. I may have not had the throttle opened up all of the way. How much of an effect would that have on a compression test? Sorry, I am new to these tractors.
Same effect as on any engine, not just a Deere two cylinder. Lawn mower engine, airplane engine, any piston engine. If you restrict the cross sectional area of the intake by X%, you'll reduce the gas mass in the cylinder so it fills at less than atmosphere, so the compressed pressure will be less. Common reason for low compression results on other wise good running engines.
FSB #160-S stated the "new" Gasline pistons for the "B" have 5 rings grooves as compared to the All-Fuel pistons which have four grooves. All-Fuel pistons should also be stamped "TOP" on the skirt for orientation, while gas pistons should be stamped "TOP-G".
This post was edited by F-I-T at 19:51:37 11/11/12.
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