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Message: <blockquote data-quote="tomme boy" data-source="post: 436718" data-attributes="member: 11342">What we are getting at is sometimes it is NOT the carb that makes a motor have idle issues. The blosk seal is just another item to look for in trying to diagnose a problem. This style of motor is one reason you can not hop up the motor. One of the easiest ways to make HP was to increase the compression. The way you achieved that was to mill the head to decrease to chamber volume. Since this motor does not have a head to remove,  the only way is to get different pistons that are made for a higher compression. I will let you in on a little secret of these motors. If you take off the side inspection cover labeled as 7,8,9,10 in the photo, plug the compression relief ports. This will raise the PSI about 15-25PSI. You may have to rejet the carb to take advantage of the higher PSI.</blockquote>