Power head swap

[imported_Billnoy]

My 80jet mod.E115JKLERS has a bad cylinder, so I bought a prop motor mod.E115TLCTE that run really well and has good comp.,in the process of swapping the powerheads I found that the early motor(TLCTE) has 1 3/16" carbs and the late motor(JKLERS) has 1 5/16" carbs. Also the early motor is a flatback and the late motor is a bubbleback, should I use the bubbleback and the the larger carbs or leave the flatback in place and use the smaller carbs ? ( when did the hp. rating change from crank to prop ?)

 

[Dhadley]

Re: Power head swap

You can use either exhaust and either set of carbs. It would be interesting to see what, if any, difference the carbs made on a jet.<br /><br />I'd probably opt for the bubble back. That way it will "appear" to be the correct motor. Dont worry about the stuffers that you have to bolt in, just leave them out. And don't worry about machining out the bottom of the center rib in the exhaust cavity.<br /><br />Don't forget what we talked about before -- the O ring on the driveshaft.