Guys, just some findings at the track yesterday...

Tried to retune engine according to your recommendations. Managed to get better low end out of corners into straights by richening HSN and leaning LSN slightly. But engine stalls when getting into corner/off throttle. Tried to increase idle considerably and restart engine but engine has difficulty in firing up. When fired up eventually, the engine sounds too lean and starters when apply throttle. When cool again, tried richening the low end again and increase idle until engine idles properly and out to track. Temp reading around 105-110 C. Bottom end suffers again with quite abit of smoke until a few laps when its already warmed up then delivery of low end is better. But engine stalls again when off throttle.

As some of you have mentioned - its really hard to get perfect tuning. Too lean and engine overheats. Too rich and engine bogs down until a few laps that it gets too hot and stalls. Has this got to do with the Head Clearance of 0.4mm shims, and plug no. 7 i'm running? I've ran a grand total of 25 tanks till now. Should i just remove 0.1 Head shim and run with the original 0.3 mm shim and start from there again? And if doesn't work try changing to plug 6? I just want my new JP to deliver good bottom end, without overheating and to idle properly.


Thanks.