Keeping my S2R 800 going and healthy. Winter small things, again ...

[stopintime]

Damn! That worked a lot better.

So much more life in the starter and it started, but stopped after about 5 seconds.


Pressure in the fuel line at/over both injectors (big splash)

Stetoscope test. Couldn't hear the desired ticking. Maybe the bike has to run to hear that sound. Maybe the tool or my ears aren't good enough. I might try that test again later.

Injectors tested. In the bracket which holds them down, but pointing towards a rag. Horisontal cylinder ok. Vertical cylinder nothing - this has been the cylinder not firing under low throttle, so not a surprise.

Tried an old injector and it sprays well - even on low throttle.


I think I'm going to ignore that when the bike now runs on only one cylinder - today it's the vertical. Two days ago it was the horisontal. 


So, this most recent problem was solved by using an extra battery to jump from - maybe also by better injection. I'll ride it when the rain stops.

[Howie]

My 1000 was dropping a cylinder intermittently.   After a lot of time on dyno the cause was the computer.  I'm not suggesting you need a computer, but diagnosis on a dyno might help.

[stopintime]

My 1000 was dropping a cylinder intermittently.   After a lot of time on dyno the cause was the computer.  I'm not suggesting you need a computer, but diagnosis on a dyno might help.

Coming up in two weeks 

[koko64]

 

[ungeheuer]

Coming up in two weeks 

Say G'Day to Juice for me 

[stopintime]

This is weird. Today mostly good, but weird...


No car battery jump today, but started pronto and (WAIT FOR IT) runs on both cylinders - on all throttle openings! Not clean. Not smooth. Not fast, but runs. Couple of hours ride - stable and nice.

I charged the battery until the green light came on (30 hours?). I can't remember it ever being green. 14 volts at 2.000 revs. Howie; should I keep a fresh battery on my wish list?

About the ECU... it's my original stock ECU in there now. Maybe I'll try the tuned old Ducati Performance ECU too.

[dimirex]

At some point, my mechanic suggested me this product: https://www.liqui-moly.com/en/pro-line-gasoline-system-cleaner-p000062.html#5153
Although I didn't have any running issues, after using the cleaner, the engine felt smoother and more willing at the lower revs...

[Howie]

Yes. 

[stopintime]

Have tried cleaners. No change.

[stopintime]

Heads cleaned. No damage. Valve seats lap'ed. Guides good.

Two tiny chips on one valve. Replaced.

Minor signs of up-down stripe wear. Will be replaced by criss-cross with the ball brush

Deep damage on one piston pin. Maybe to be expected after 240,000km. SOMETHING has to give?

New pistons in  

That's it for day 1. More diagnostic work tomorrow.

[koko64]

What compression ratio pistons.?

[stopintime]

What compression ratio pistons.?

Don't know. Probably won't know. These are labelled "796 big bore 90mm". Their dome is lower and might give a softer combustion (so they say). Have been 11:1 so maybe the same...

[stopintime]

Everything back together and today tuned.

WOW

Five fresh bhp despite higher squish (1.4 vs typical 1?). New injectors which I believe might have been the main issue with the stumbling and one-cylinder-running. Very tired pistons and valves gradually made things worse.

As always; surely this is a big TBC, but for now I'm satisfied

[koko64]

Excellent. You have extracted more power with each rebuild. Very impressive.

[ungeheuer]