First post. Engine setup

[V8Astro]

I?ve been lurking here for a while. Lots of good info and I thought I might post to show what?s going on. I have a 2013 EC300e supermoto. I ride it exclusively on the street. I felt it could use a little more top end since this engine has tons of low and mid power.

I?m adding another base gasket under the jug in an effort to get my piston flush with the exhaust port floor. The bike has 17hrs on it and the piston looks fine so I?m going to reuse it. After that I?m going to check the squish and have my machinist friend make any adjustments to my S3 head. The S3 head made a big difference but I installed it before I spent hours reading this forum.

I have a Scalvini pipe and silencer in order. Should show up in a few weeks. Any other input from the pros?

I never would?ve got this far if not for this forum. Thanks everybody!

 

[(F5)]

Have you tried new needle or mains?

 

[V8Astro]

Yeah JD jet kit was one of the first things I did

 

[V8Astro]

One question...the jug currently has a steel shim type gasket under it. Is it ok to stack a paper gasket on top?

 

[(F5)]

Yes but use 3Bond or flexible master gasket with it.

I don't understand people's fascination with the bottom of the exhaust port. The top is the important part. Given that raising it independently is difficult.

You should measure the compression ratio properly (with a burette). A screw in pressure gauge is misinformation. YouTube it, then you can adjust it appropriately to account for your fuel and what sort of overrev you want.

 

[V8Astro]

Yes but use 3Bond or flexible master gasket with it.

I don't understand people's fascination with the bottom of the exhaust port. The top is the important part. Given that raising it independently is difficult.

You should measure the compression ratio properly (with a burette). A screw in pressure gauge is misinformation. YouTube it, then you can adjust it appropriately to account for your fuel and what sort of overrev you want.

You know how the bike runs. Gobs of power down low and in the mid range. I need to shift my power up higher for my needs. From what I?ve read this is the simplest path to that goal

 

[(F5)]

Pipe is a factor and see you have something on order, just no idea of that make.

 

[Davehuge]

I assume on the road you can run much longer gearing.

Have you tried different sprockets/smaller rear sprocket?

 

[V8Astro]

I assume on the road you can run much longer gearing.

Have you tried different sprockets/smaller rear sprocket?

Yes. Currently running 13/38

 

[V8Astro]

Pipe is a factor and see you have something on order, just no idea of that make.

Scalvini pipe and silencer. I hope it does what I need

 

[V8Astro]

Got my head back from my machinist friend. He took .020? (sorry I?m showing my American now posting measurements in thousandths of an inch) and I achieved .048? squish. Which I translated into 1.25mm

 

[Zman]

Looks great! 0.48 is good but you need to also check your compression. What octane fuel are you running?

 

[V8Astro]

Looks great! 0.48 is good but you need to also check your compression. What octane fuel are you running?

That?s my next step. I bought a burette on amazon. I?m running US gas 93 octane (r+m)/2

 

[Jacob 'Berg]

I thought this may be useful:

http://49ccscoot.proboards.com/thread/5043/calculating-stroke-compression-ratios

 

[(F5)]

And there's this
Gets a bit off topic but comes right in the end.

Actually it's not a bad thread if I say so myself. Lots of points I'd forgotten on the first page.

http://www.gasgasrider.org/forum/showthread.php?t=16560&highlight=Head

 

[V8Astro]

Very helpful links. Thanks everyone!

 

[V8Astro]

I cc?d the chamber today. I did it about 6 times to make sure my results were repeatable. Once I got bad reading because of an air bubble in my burette.

I settled on 23.4cc. Running the calculations I got 13.5:1 Comp. Should I leave the chamber alone or should I take some material off? I?d like the Comp high as 93 octane will allow.

 

[(F5)]

MON or RON? I forget which is higher. Google it for your country.

 

[V8Astro]

Average of the two (R+M)/2. I think our 93 is like euro 98 RON

 

[(F5)]

I wouldn't go any higher that should just be ok if your petrol is consistently ok.
So that is 2 threads up the spark plug threads? If it's to the top you will have to adjust.

I had to take quite a bit out of the chamber to get compression ok.