Adjusted the pilots NC30

[karl BKK]

I assume the pilot jets running at a value less than that of standard wouldn't damage the engine by running lean, as the main concern for an engine running lean (carb'd engine) is down to the main jets and emulsion tubes, correct me if i am wrong..... Ex diesel mechanic you see :D

You are correct, very little damage can be done as the pilot screws control the fuel at very low engine speeds/loads. Just use the setting that works best for you.

The engine will ping (detonate) well before engine damage is done if you've leaned the pilot screws off too much - you'll hear it. Even at these low loads/rpm it will take something way off to cause damage (incorrect pilot crew settings won't do long term damage - these engines are strong).

Main jets (which control high rpm fuelling) can do damage if too lean (less so if too rich but can still cause damage over the long term).

Thanks for the confirmation Cammo, also have to get a new rad cap, when i took the plastics off i could see a slight weaping from the cap. closer inspection showed the cap's o-ring has perished some what.

I'm also ASSUMING that my bike will most likely have the standard Japanese 'lean' main jets....... If exporting the bike to the UK then yes i can understand that the jets they run in Japan would of course be very lean in the cold UK weather....... BUT here in 30 - 40 degree Thailand those lean jets would prove to be about right i guess. as going upto 118 - 120 would be mega rich if 'm to compare the ambient temps here to your set ups back home in the UK, once again correct me if i'm wrong :)

[Neosophist]

Sounds logical to me.

http://www.factorypro.com/tech_tuning_p ... gines.html

This is quite useful, written by factory pro on how to tune carbs step by step.

Good read even if your used to tuning carbs.

[karl BKK]

Sounds logical to me.

http://www.factorypro.com/tech_tuning_p ... gines.html

This is quite useful, written by factory pro on how to tune carbs step by step.

Good read even if your used to tuning carbs.

Indeed that is a good read, makes me think my jets are too big!!!
As my bike pulls better when cool / warm and pulls slightly less when upto temp.
I'm very interested to see what jets i have, the exhaust was very sooty but not overly so.
Excited to get some tools again soon, although they will mostly be made from chocolate compared to my old stuff lol :D

[Neosophist]

probably is too rich then :)

If you get it on the dyno you'll get a good air-fuel graph to work from.. combine it with that site and you sould be able to tune it pretty well

[karl BKK]

I took the plastics off of the bike for a bit of a clean today and when the engine was running i noticed that the rear right cylinder was running cool, when compared to the down pipe next to it. On closer inspection i found that the HT lead had parted from it's boot and connection within it.
So i stripped back the corroded cable and reconnected it, an instant 25% increase in power and now the bike revs a bit better.

This problem laid undetected due to never having owned a VFR before and i just assumed they burbled and misfired a little more than an inline 4 would.
Fortunately on reconnection of this HT lead the cylinder warmed up instantly, which was a relief as i didn't want buy another plug for it this weekend and take the tank of blah blah blah :D
Now that this cylinder is firing the bike seems to rev better with the pilot screws at 2.5 turns, time to take her out for a sprint.

Always nice to revive a bike :D

[J.B.]

Karl I have a good set of vacuum gauges so if you're in Bangkok bring your bike 'round and balance the carbs here if you want. I live in Sukhumvit near Emporium. PM me.

Jimmy

[karl BKK]

Karl I have a good set of vacuum gauges so if you're in Bangkok bring your bike 'round and balance the carbs here if you want. I live in Sukhumvit near Emporium. PM me.

Jimmy

Sweet mother of god, i honestly wasn't expecting that :D
That's a great idea, i'll finish work and email you mate :)

karl

[Neosophist]

This problem laid undetected due to never having owned a VFR before and i just assumed they burbled and misfired a little more than an inline 4 would.

It's a Honda, it should be like a swiss watch

[karl BKK]

This problem laid undetected due to never having owned a VFR before and i just assumed they burbled and misfired a little more than an inline 4 would.

It's a Honda, it should be like a swiss watch

Good point, I have never seen a Honda broken down on the side of the road before........... not once! :)
I have to correct my comment above, "missfire' i actually mean backfire. :)