Wont Start!!!

[iamovru]

How did you know it was lean with the NECJ if it wouldn't start?

It did start and ran good for a while but then it started to ping. Thats when I could tell it was lean, but thats when it was too late.

[twowheels]

How many hours did you have on the piston? What kind of fuel and oil are you running? It looks like there was a lot of build-up past the first ring. I would have expected the skirt to possibly stick as well if it was really lean. Any idea if there was an air leak introduced somewhere along the line?

[dibbs]

Phew!!! well done, there are some very knowledgeable people on here. Good luck with the re build.

[iamovru]

How many hours did you have on the piston? What kind of fuel and oil are you running? It looks like there was a lot of build-up past the first ring. I would have expected the skirt to possibly stick as well if it was really lean. Any idea if there was an air leak introduced somewhere along the line?

Hey Steve

Maybe 60 hours on the bike. 91 octane and Klotz Supertechnoplate at 50:1 as always. I can tell you that the bike was running great until I decided I would make it run better I changed the needle to the NECJ and it started knocking and pinging after a while. As far as air leak? Where would that normally come from?

[iamovru]

Phew!!! well done, there are some very knowledgeable people on here. Good luck with the re build.

Thanks

[ricoyam]

I notice the ring gaps are very close to lined up. There should be pins in the ring lands/grooves to hold the end gaps apart from each other. Beside limiting the blow by past the ring end gaps it also serves to keep the ring ends lined up, out of a port to prevent the ring from snagging. It's possible what you though was pinging was the sound of a ring lightly snagging a port. Pinging should show signs of detonation on the plug and/or piston dome.

[iamovru]

I notice the ring gaps are very close to lined up. There should be pins in the ring lands/grooves to hold the end gaps apart from each other. Beside limiting the blow by past the ring end gaps it also serves to keep the ring ends lined up, out of a port to prevent the ring from snagging. It's possible what you though was pinging was the sound of a ring lightly snagging a port. Pinging should show signs of detonation on the plug and/or piston dome.

Thats interesting, thanks

Here is the link on TT if you want to read other thoughts.

http://www.thumpertalk.com/topic/1211617-wont-start/

[Enmerdeur]

Looks like you have been running rich and slow. The photos on TT showed the top of the piston with lots of build up. Super Techniplate is probably not the best choice for your style of riding. It contains some castor which can gum things up if not ridden hard. That would be my guess as to your stuck ring.

[iamovru]

Looks like you have been running rich and slow. The photos on TT showed the top of the piston with lots of build up. Super Techniplate is probably not the best choice for your style of riding. It contains some castor which can gum things up if not ridden hard. That would be my guess as to your stuck ring.

I believe you are correct

[twowheels]

Looks like you have been running rich and slow. The photos on TT showed the top of the piston with lots of build up. Super Techniplate is probably not the best choice for your style of riding. It contains some castor which can gum things up if not ridden hard. That would be my guess as to your stuck ring.

What he said