What happened to the Gap

Thinking back, I do remember the pinking when accelerating from about 100 mph, was very annoying as the bike was flying, and was as I say ignition related.
 
We have a couple of suspicions as to why.First culprit might be the Kehan CV carbs.So I am going Reds Flat slides,the 2nd might be me and my fiddling with the static timing.I know just enough to be dangerous.What I did was use a dead stop to find TDC on No1,drew out a circle the diameter of the flywheel and marked the distance 36 degrees and 12 degrees scribed at.Marked the flywheel and checked this with a timing light.Then I moved the timomh to suit or as close as I could considering the Kawasaki alternator blocked access to the alan bolt for a tiny bit.I then used John Wilson's curve No 3.It felt better in the mid range.I then tested the bike on the biggest hills around in 3 gear giving it fist fulls,didn't hear any pinging.Maybe I need a Honda boring with factory sealed Injection and timing.Anyway there is a lot more access to the new Sach Ignition with the potential for damage so take care out there.So if you cannot read plugs these days is a trip to the dyno the only safe was to detect Detonation,can it be detected before it destroys your engine.Seems from that article earlier in the thread,Detonation can exist in mild forms for a while and not do damage,preignision takes seconds to damage engines.I always try to use the highest octane fuel I can but have used 95 when I cannot get 98.These numbers are different over the planet.The article said Hemi style heads were the worst type for Detonation and I think thats Laverda style head,Yes?

 
mauricejota7604 said:
Hey Vince wouldn't you hear the engine pinking its head off???? 
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ay Maurice.  pay a fuckin' attention will yer !!

Brett said:
Detonation is different to pinging in that sometimes you cant hear any audible noise such as pinging which usually occurs under acceleration.
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I checked it on the big hill past the local golf course,3rd gear low speed and fully open throttle.no pinging.No ear pugs at that time.Plenty of big hills on the Bellengin trip,ear plugs in then.Never heard any pinging,although Cosi heard nothing either,but at big speed with ear plugs in?.Plugs always come out sooty.
 
Vince said:
...,but at big speed with ear plugs in?.Plugs always come out sooty.
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Now I am worried in regard to your personal health. Running a bit of a fever are we?  :o
 
Vince a big hill in third gear is not the same as a top gear hi load work which you have been doing of late? Even without ear plugs you wouldnt have been able to hear it..
Did I read correct that you were using curve 3, on the IIS that has a total advance of 38 degrees faark not good for extended long load work plus you could have had even more as you played with the timing.

Why I suspect detonation as apposed to other factors is purely based on the information which you provided... that the damage to the pistons near the inlet pockets.. and that the rest of the pistons and the head have a sooty look.....

Anyway reckon that you should let Red sort it out, especially as you are going his carbs, good call. Vince I will be going up there second week of December so can take you engine up for you.

See ya Wednesday night .. by the way sorted your charger out, even though I missed my OPSM appointment, so had to use the solder station with its 10 to 1 magnification  :D..


 
Brett,yes curve 3.Probably not fully around to that statically.So 36 or a bit less.I thought curve 3 and curve 2 started and ended the same.3 ends at 38 and 2 endes at 36.Curve 3 felt stronger in the mid range.
 
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