Jetting in 35 degree Thailand (Cammo?)

[karl BKK]

Just checked the jets in my nc30's carbs and the rear carbs are jetted to 112 and the front 110.
Now i believe that is a stock set up for a jap import and in Japan where it's much cooler and in the UK that would be a pretty decent jet setting to have on a stock bike.
how ever i live in Thailand and the temps never drop below 35 during the day.
My question is, when taking in to account the high ambient temps should i drop a jet size or two?
I have noticed the bike pulls better before it's up to it's full operating temp and at night time (20 - 25 degrees ambient temp) the bike pulls better too :)

I guess Cammo who lives in Australia would be able to guide me on this, as it gets pretty toasty down there too :)

[Cammo]

IIRC your bike had an rvf engine & loom didn't it Karl? Are you sure you have vfr carbs on it?

The vfr carbs have metal slide covers, the rvf carbs have black plastic slide covers.

I would think those main jet sizes are a bit lean for vfr carbs, check what sort they are!

[karl BKK]

The bike has VFR carbs Cammo, on closer inspection the whole bike is VFR with exception of the rev counter, hence why it doesn't work well :D
Carbs are back on the bike now, whoever they will prob come off again soon as i need to tinker with them a little to get them where i want, on removing them again i'll check out what jets they are (looked standard to me)

so 110 fronts and 112 rears would be a little lean for 35 degree Thailand?

[superlite]

So 110 fronts and 112 rears would be a little lean for 35 degree Thailand?

Way lean! Try the old recipe of 118/120 for starters I reckon, and go from there. Should be some cheap horsepower!

[karl BKK]

Woooo, what was the standard jetting for jap import bikes?
I'll hunt down a set of 118 / 120's :)
but it is strange that the bike runs better when ambient temps are lower, tonight when i cam home (20 degrees v's 35 degree day time temps) it was flying, she was really on song.
Colder ambient temps = denser air and a leaner mix, chucking in larger jets would make her bog down right???

[GCD]

Hi Karl,

I am running 112/115's on my VFR in BKK. I did try 115/118's and it was too rich, the current set-up seems to be going well at the moment. I have just installed the notorious rubber flap at the front of the air box, so hopefully it will run a little better at top end now. I'm taking it for a spin in the morning so will let you know how it goes.

I don't know how you guys get the 118/120 jets to work properly.......maybe it is the colder temps.......

[karl BKK]

I don't know how you guys get the 118/120 jets to work properly.......maybe it is the colder temps.......

Exactly that mate, colder ambient temps = more air.
I might bump mine up a little, maybe to where you have yours now.
My bike is an absolute monster at night (20 - 22 degrees) but bogs a little during the afternoon heat, i might jump up to 112 and 114, i'll only need to buy two jets, as i already have 112's in the rear which i'll switch to the front and whack 114's in the rear.
But Cammo's running pretty large jets though in Australia...............????

[superlite]

Might be a humidity thing?

[Cammo]

But Cammo's running pretty large jets though in Australia...............????

118/120 works pretty well for me, certainly not too rich. It will depend on your weather though.

The last road bike I had with nc30 carbs I actually ran 120/122 which were fine.

I've never changed jets in my roadbike for different weather/seasons, but on the racebike I change them for winter/summer conditions.

[trademe900]

110 front and rear is pretty weak and lean running in New Zealand at 24 degrees heat if that helps. A lot better once up to temperature though.

Isn't the rule if it pulls harder when hot it's lean, pulls harder when it's cold then it's rich?

I'm with you Karl BKK in thinking that you'd need smaller jets.

Is it a stock can?