I can always be trusted with someone else's checkbook/credit card....

 

Mine are starting to weep and I will ride until winter. I have installed the EV27 and Dyan ignition, what will the 9.5-1 pistons do for me? thanks

 

When I put mine in it gave me a little more power and cost me mpg.
If I had it to do over I wouldn't do it.

Just my 2 cents.

 

Thanks for the reassurance folks. Apparently it looks worse than it is. I put some paper towels under it overnight and not a drop off the case.

Uncle Larry- Not running synthetic, and it was at operating temp when I took the pics. It was the first time I fired it up this season though.

Glidein- Will double check the vent system, thanks.

Hack'd- It already has a SEIII cam in it (which I think is equivalent to the EV27). If it can wait 'til next winter, we'll see how crazy I want to get with it. Reliability is most important to me. I've got 76K on it, and was hoping to reach 100K without too much nuttiness.


I cleaned it up and put a bead of flowable silicone (Permatex 65AR) over the area. Hopefully that'll get me through the season and through a 2800 mile vacation this summer.

 

Sounds like your umbrella valves hardened over time and need replacing. Real easy fix and while your at it retorque the top end.

 

The base gasket job isn't difficult, just time consuming. Half of the time for me was spent scraping gasket. I was very careful not to goober up the aluminum. I once read about a guy that claimed that he let a base gasket go for a while and when the base gasket got real sloppy it caused the head gasket to go. I used Genuine James base gaskets and HD everything else when I did mine.

 

I second this. The worst part is removing the old gasket, I spent a ridiculous amount of time trying everything on it. If I did it again I'd pay someone to clean the head and cylinder surfaces and I'd also buy the rocker box tool instead or using a cut Allen wrench.

 

Thanks

 

Freshened up the top end on my ’96 springer last fall @ 36K miles. My base gaskets were leaking worse than yours. Stock pistons were cleaned and reinstalled, new rings, new EV27 cam and new roller tappets. Bike runs great and very pleased with performance.

 

Evo's in stock form are a slug, need some compression to get ahead of the blue hair in a Buick. EV27"s work by a earlier intake timing that creates more cylinder pressure. Yes that will make most Evo owners happy but a known secret to a Evo is compression and 9.5-1 isn't going to create reliability factors plus compression can add efficiency plus EV27 early intake timing finishes it of.

There is no reason why a 75 hp Evo equipped with a CV cannot get 45-48 mpg, turning screws and guessing at jets is just a guess in tuning so struggling an efficient engine cannot produce.

It always comes down to what the owner wants, If the owner is satisfied with a flat sounding Evo exhaust sound then that is what matters it is his bike and the motto of the Evo section and money plays a part in engines, will snowball until completed so if cleaning up 8.5-1 pistons for a budget reuse is what many applaud plus working on a bike in your garage is about, if wanting a little giddy up by efficiency then compression will work and not a hidden secret.

Yes those base gaskets become harder than a wedding d$!k and can destroy a set of cylinders trying to get then off, alot of neat tricks in these forums on a home method of truing bases up for reuse