NC 30 runs like a sack of ****

the fat jedi · 03-04-2007, 12:25 PM

Hello A few months ago i got myyself a nice little NC 30 to use as a track bike.
But when reved to 7000rpm its fine, over that its real bad.
so far i've tried (from my friends doner bike)
Pulser units
Coils
ECU
complete wiring loom
I've also tried many different jets and even another set of carbs,
Compression is good, valves are fine, the list goes on,
Has anyone else encountered this problem?
Many thanks

Macattack · 03-04-2007, 1:37 PM

Quote:

Originally Posted by the fat jedi

Hello A few months ago i got myyself a nice little NC 30 to use as a track bike.
But it has when reved to 7000rpm its fine, over that its real bad.
so far i've tried (from my friends doner bike)
Pulser units
Coils
ECU
complete wiring loon
I've also tried many different jets and even another set of carbs,
Compression is good, valve are fine the list goes on,
Has anyone else encountered this problem?
Many thanks

Hey, used to have an NC30....GREAT bike...........never had any problems like that though??

What about the exhaust system.....has it been modified in any way??

the fat jedi · 03-04-2007, 2:41 PM

Hi
Its got a race can but nothing else

Macattack · 03-05-2007, 2:37 PM

What rpm does the bike idle at and is the rev needle steady.......if its jumping all over the place the engine isn't balanced........also from previous experiences if there is something wrong with the alternator the bike loses power...............after 7000 rpm's is the bike immediately losing power or will it not just go past 7000 revs??

the fat jedi · 03-05-2007, 2:47 PM

it ticks over quite nice, but as soon as it revs past 7000 revs
it stops pulling and starts mis-firing I'm still not sure if its an electrical
or a fuel problem.
Would the alternator show these symptoms if it was on the blink?

Macattack · 03-05-2007, 3:26 PM

Quote:

Originally Posted by the fat jedi

it ticks over quite nice, but as soon as it revs past 7000 revs
it stops pulling and starts mis-firing I'm still not sure if its an electrical
or a fuel problem.
Would the alternator show these symptoms if it was on the blink?

Mmmm....sounds as if the needles and valves are not set up right.......I had a ZXR750 and a friend of mine (at the time) started messing around with the needle set up and moved the two inside needles higher than the two outside needles and the bike would back fire and there was no speed at all.......the problem you have with the NC30 sounds like this.....you need to get someone who knows EXACTLY what they're doing to balance the needles and air intake properly and then the NC30 should be fine then.

the fat jedi · 03-05-2007, 4:32 PM

I think you may be right, thanks for your replys anyway

soupnazi · 03-05-2007, 9:51 PM

Sounds like it's running rich. Does it blow a whole bunch of smoke at those revs?

Macattack is right, though it's not that difficult to balance them. Just fiddly.

the fat jedi · 03-12-2007, 5:54 PM

Quote:

Originally Posted by soupnazi

Sounds like it's running rich. Does it blow a whole bunch of smoke at those revs?

Macattack is right, though it's not that difficult to balance them. Just fiddly.

we've had just about every size of jet possible but still no joy

nedro · 03-12-2007, 6:53 PM

Check float bowls. They may be running low.

the fat jedi · 03-13-2007, 2:47 PM

Hooray it lives
Many Thanks for all your help.
In moment of insperation a friend of mine said "you no if you take
the speedo off it will be restricted"
One plug in module later sorted.

Thanks Again

Terry