rebuilt powerhead how hard to install

[kylake254]

have a 1978 115 hp johnson #1 cyclinder has only 10 pounds pressure others are around 90-95.one place said to charge the #1 cylinder would be around $1500.found a place for a rebuilt powerhead he said it would be $1700 with a year warranty on it.first off does this sound right .next how hard is it to take off and put on new powernead?

 

[jonesg]

Re: rebuilt powerhead how hard to install

How do you know its not just a head gasket problem?

 

[kylake254]

Re: rebuilt powerhead how hard to install

had new head gaskets put on last year.

 

[HybridMX6]

Re: rebuilt powerhead how hard to install

I say to pull the heads off and take a look. You're going to replace the powerhead anyways, so why not pull the heads and determine what is wrong and why it's got low #'s in that cylinder before spending any money.
as for the question, as long as your mechanically inclined to do it yourself, go for it. I'd buy a factory manual (unless you already have one) and also get all the necessary gaskets and sealers you will need for the job ready to go. Is it just the block, or does it come with new carbs and all also? If not (and even if it does come with new ones) you need to find out why that cylinder is low, otherwise you may well be spending the money again in a short while.

 

[kylake254]

Re: rebuilt powerhead how hard to install

no new carbs but will get rebuild kit for them.also why do you ask if i get new carbs?could the carbs have messed up the #1 cyclinder?

 

[iwombat]

Re: rebuilt powerhead how hard to install

Yes.

The fuel system in a 2-stroke delivers both fuel and lubrication. If the carb wasn't functioning properly, it could have leaned out, and under-lubricated #1.

 

[HybridMX6]

Re: rebuilt powerhead how hard to install

What he said ^^^
You need to determine what happened before you do anything, and make sure you fix it before you run it again, or more damage will occur.

 

[kylake254]

Re: rebuilt powerhead how hard to install

will do that thanks guys

 

[emdsapmgr]

Re: rebuilt powerhead how hard to install

I'd take the top carb off. Pull the idle and esp the high speed jets out of the barrel that feeds the #1 (low compression cylinder.) Look for any debris in the jet that could cause a fuel restriction.