Guide to timing my sigma 150 -also useful for 140 supersport

[pilotprice]

Update -

Apologies for the confusion here! Please see below -

The engine was timed at 118 inlet and 111 exhaust beforehand.
Yesterday I mistakenly timed the exhaust cam thinking it was at 118 and not 111 and advanced the cam 8 degrees! I also was doubly confused as I had timed the engine yesterday anti clockwise!


So

Today I have re timed the engine to 110 inlet and 110 exhaust, the original 149.6hp bench mark still stands at timing of 118 inlet 111 exhaust

Off to the rolling road

[pilotprice]

Update -

Apologies for the confusion here! Please see below -

The engine was timed at 118 inlet and 111 exhaust beforehand.
Yesterday I mistakenly timed the exhaust cam thinking it was at 118 and not 111 and advanced the cam 8 degrees! I also was doubly confused as I had timed the engine yesterday anti clockwise!


So

Today I have re timed the engine to 110 inlet and 110 exhaust, the original 149.6hp bench mark still stands at timing of 118 inlet 111 exhaust

Off to the rolling road

[pilotprice]

Just took it for a drive, obviously have a 3.92 diff now and aeroscreen so can't comment too much, however I would say the engine feels less zingy and more how can I say, boggy?

Looking forward to the rollers

[pilotprice]

No problems, its easy enough to put back with the timing tools I made.
Im going to bet against 118 111 though

[pilotprice]

Just got off the RR

Made 145.6hp and 116lbft, power drops off towards the end

The chap overlapped the maps for comparison

Time to re-time to 118 111

[pilotprice]

No problems, it goes someway to sorting out the mystery timing!

Could you please comment on my other post regarding the breather setup of your 150?

If you need a carb syncrometer and mbe lead then I can lend them to you as your TPS and idle speed will change with the timing