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Old 09-26-2018, 10:46 PM
icebergstu icebergstu is offline
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Join Date: Aug 2018
Posts: 21
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Whatever I do it makes no difference at all...

So, I've stripped and leak tested the pilot circuit - all good
Set and re-checked float level at least 5 times
Changed from 38, 40, and 42 Pilot with no gains.
Changed from N1EG to CCK to CCL needle, no gains.
Changed from 170 to 172 to 175 mains, no change.

This bike was purchased as a project.
Seized top end, fresh bottom end. The bloke did the motor up and forgot to put oil in the fuel and she nipped up after a short time.
I renewed the top end, rebuilt the forks and had the rear shock rebuilt.

After the text book run in straight from the owners manual it was okay in the beginning with the BP5EY plug, N1EG needle, 40 PJ and 172 MJ but using too much fuel, smoking everyone out and spooging badly. It was not very smooth off the pilot and wouldnt idle even with the idle screw completely wound in.
Ring gap was perfect when I installed the C piston after a hone.

I had no idea what plug was supposed to be in there but the guy had given me a few new ones. I found out it was too hot.
Went from a lawnmower BP5EY plug to a BR8EG as suggested so I dont burn a hole in my piston apparently.

So after that first ride I did this:

• Installed new plug BR8EG
• Checked and reset float perfect both by blow method with seam, then checked again tilting carb connected to tank and then again tilting bike until it flowed out of the overflow. Spot on!!
• Checked for pilot leak by turning carb upside down, filling with fuel and blowing air into pilot circuit and looking for bubbles. Perfect seal, no issues.
• Checked all breather hoses, blew out and made sure all were clean.
• Changed to CCL needle and it was worse when running on the pilot but as soon as it got on the mains it was great.
• Changed to CCK needle it was no real difference and did a full 2nd ride. In the Vimeo linked vid you can hear how appalling it is running off the bottom.
• Now I've done every possible combination of bloody jets and needles besides going back to the N1EG and it's still shit.

Maybe...

1. When he did the bottom end work he screwed the timing up? Could that effect it?
2. Could my choke be causing the issue by not sealing properly?
3. Is everyone wrong about these jetting specs on the Jetting page?
4 is this just how these bikes are actually supposed to run?
5. Should I just get a bigger Power Band

How it is currently running:

https://youtu.be/SaGL9Xu6LS8

How it ran on the last ride:

https://vimeo.com/291824548

I can still try clip positions...havnt done that yet but will that effect the pilot circuit?

Stu

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