It lives...

[Minimoto]

I've just spent the last few days rebuilding my carbs and got the bike running about 5 mins ago, so feeling quite happy right now :-)

There are a few issues though...

The carbs will need balancing and the clearances setting up properly as it's been a long time since a service. Everything is on the stock settings at the moment with the pilot screw set to 1 and 5/8th's out, but I'd like to add an extra 0.5mm washer under each needle, drill the slides to 2.5mm and up the main jets to 110/112.

When I fired it up a moment ago I used a separate container for fuel supply but had the airbox and filter fixed in place. I only fiddled with it for a minute or so as its 2230 here and the neighbours wouldn't appreciate the noise. Once set to idle the revs were pulsing, a second fast a second slower.....

Would anyone might know what might be causing this...?!

Cheers,
Dave

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[st22041967]

A particularly bad balance can cause this (it did in mine). Also are you sure about 1 & 5/8 ? If your standard then 2 turns should be fine....


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[Minimoto]

Hi st. The bike seems to have settled a bit after running some more this morning. Also noticed I hadn't got the choke bar fitted quite right on the rear two carbs.

The exhaust off the front two cyclinders is popping every so often...

With the pilot screw, I'm just going from the Haynes manual... I'll have the carbs off later so can try 2 turns and see what difference it makes.

The balancing has been a visual attempt so far. I've not dug this deep into the bike before, so learning a few new things and looking forward to getting it running smoothly.

Just about to order some new main jets. Whilst the stock ones are 108 all round, I was going to go for 110f and 112r rather than the same on each carb. I've read posts where people have done all the same sizes and mixed sizes... What do you think?

Dave

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[st22041967]

Well this is the info I have found after searching this forum and various manuals. Others please advise me if I am WAY off. This would be a rough starting place if you don't have a clue for a NC30

FRONT

Needle = J51B
Emulsion Tubes = 4 Holes, Part Number = NEEDLE JET 16165MR8740
Pilot Jet= 35, Part Number = JET, SLOW 991034370350

MAIN JET
If Japan 1989, Pilot = 2 turns, Size = 110, Part Number = Keihn 99101-393-1100
If Japan 1990 Onwards, Pilot 2 turns, Size = 115, Part Number = Keihn 99101-393-1150

If UK Aftermarket Exhaust, Pilot 2.25 turns, Size = 118, Part Number = Keihn 99101-393-1180
If UK Standard Exhaust, Pilot 2 turns, Size = 120, Part Number = Keihn 99101-393-1200
If UK Aftermarket Big Exhaust, Pilot 2.25 turns, Size = 120, Part Number = Keihn 99101-393-1200


REAR

Needle = J51A
Emulsion Tubes = 5 Holes, PartNumber = NEEDLE JET 16165MR8750
Pilot Jet= 35, Part Number = JET, SLOW 991034370350

MAIN JET
If Japan 1989, Pilot 2 turns, Size = 110, Part Number = Keihn 99101-393-1100
If Japan 1990 Onwards, Pilot 2 turns, Size = 118, Part Number = Keihn 99101-393-1180

If UK Aftermarket Exhaust, Pilot 2.25 turns, Size = 120, Part Number = Keihn 99101-393-1200
If UK Standard, Pilot 2 turns, Size = 122, Part Number = Keihn 99101-393-1220
If UK Aftermarket Big Exhaust, Pilot 2.25 turns, Size = 122, Part Number = Keihn 99101-393-1220

[Minimoto]

Cheers st. Mines a 94 reg with Japanese fitted after market pipes. Perhaps I should just get a proper dyno run on it :-)

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[Minimoto]

We are talking NC35 not 30...?

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[st22041967]

Yup looks like I'm totally the wrong track. I had assumed a NC30 but in fairness you didn't mention the bike. Info is for the NC30 sorry.

[Minimoto]

Hey, no probs!

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