Runs like a sack of hammers

johnnyyellowpants · Post by **johnnyyellowpants** » Tue Oct 20, 2009 7:27 pm

Hi,
I have a nc 23 J which I have bought as a "project" track bike.

I have just got it back to-gether and here`s my problem.

It would only run on 3 pots, number 2 being the duff`un.

It had a good spark so I stripped the carb hoping to find it full of gunge!

In fact the carb was really clean inside but the pilot jet was blocked?
I cleared the jet and reassembled the carb, and off she went on 4 cylinders again.

But.......... I wont rev above about 6 k??

Now I don`t have an airfilter fitted at the moment (long story) do you think this is the problem?

Yes I know it not a good idea to run it without the filter

Thanks
JK

Post by **CMSMJ1** » Wed Oct 21, 2009 11:18 am

lol - put a filter on it. it may just be too lean to rev above 6k
or, do you have a speedo connected?

Post by **Evilchicken0** » Wed Oct 21, 2009 9:17 pm

It should rev above 6k without a filter, bikes run faster with a weaker miture.

Compression test it

johnnyyellowpants · Post by **johnnyyellowpants** » Wed Oct 21, 2009 9:24 pm

My mate is bringing his compression tester round on Saturday.

Watch this space!

Post by **Drunkn Munky** » Wed Oct 21, 2009 9:30 pm

If there the same as NC30/35's then as CMSMJ1 said if the speedo is not connected it wont rev above a certain rpm

johnnyyellowpants · Post by **johnnyyellowpants** » Thu Oct 22, 2009 6:24 pm

The came to me in track formate, no speedo.

Is there a way of eliminting the speedo?

thanks

JK

johnnyyellowpants · Post by **johnnyyellowpants** » Sat Oct 24, 2009 6:36 pm

Did the compression test today, 3 @ 110 PSI and 1 @ 105.

Improvised an airfilter and let it warm up thoroughly, now runs fine.

Thanks

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