V4 Carb Sync Guide
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Please can you post items for sale or wanted in the correct For Sale section. Items / bikes for sale here will be removed without warning. Reasons for this are in the FAQ. Thanks
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bikemonkey
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- Bike owned: 92 NC30, 90 VFR750
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Re: V4 Carb Sync Guide
I would think so speedy, check your haynes, should have the differences in there 
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Sunnyday
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- Bike owned: UK NC30 17" Rear.
Re: V4 Carb Sync Guide
Update on balancing my carbs - NC30.
I found sucking on the vacum pipe and then sliding a screwdriver up the pipe is all it needed and ran as normal while i went to work, it has took me a few goes but i have managed to get them balanced nicely ....all i will say is you will need have small hands to get away with a 7 mm socket i souced a flexi screwdriver that took the 7 mm socket which made it easer but still hard work to get it on and off the adjusters, i sugguest you have two people , one to start the bike each time you make an adjustment to save getting off your back every time start the bike to look at the guages.
I found sucking on the vacum pipe and then sliding a screwdriver up the pipe is all it needed and ran as normal while i went to work, it has took me a few goes but i have managed to get them balanced nicely ....all i will say is you will need have small hands to get away with a 7 mm socket i souced a flexi screwdriver that took the 7 mm socket which made it easer but still hard work to get it on and off the adjusters, i sugguest you have two people , one to start the bike each time you make an adjustment to save getting off your back every time start the bike to look at the guages.
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shaneo
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Re: V4 Carb Sync Guide
bikemonkey, is that a morgan carbtune you used? http://www.carbtune.co.uk/carbdtls.html
if so, how do you find it to use? ok bit of kit?
if so, how do you find it to use? ok bit of kit?
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bikemonkey
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Re: V4 Carb Sync Guide
Yeah it was.
Was pretty easy to use, nice bit of kit
Was pretty easy to use, nice bit of kit
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Sunnyday
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Re: V4 Carb Sync Guide
2nd that - that's what i used silly simple you can not go wrong.
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shaneo
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Re: V4 Carb Sync Guide
excellent! just ordered one and now the wait for it to arrive on the other side of the world :/
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NC35Race
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Re: V4 Carb Sync Guide
http://www.400v4service.nl/content/2013 ... 0-aug-2013
Last edited by NC35Race on Fri Jun 30, 2017 8:05 am, edited 1 time in total.
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eeikcud
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Re: V4 Carb Sync Guide
Just a nooby question. Do we leave the carb rubber off or we fit them also while doing the sync?
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bikemonkey
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Re: V4 Carb Sync Guide
The inlet rubbers?
Leave them on dude.
Leave them on dude.
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crookzy1
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Re: V4 Carb Sync Guide
Thanks for this guide.
If you either don't have a carb balancer, or you don't have the tools/skill to adjust the screws whilst the carbs are on the bike, you can do the following.
Take the carbs off the bike and observe the butterfly valve for carb 4. Adjust the idle screw for carb 4 until the butterfly valve reveals the first of the very small holes inside the carb. Adjust the idle screw it until all you can see of this first hole is a minuscule crescent. Adjust the screws for the other three carbs so that they match this crescent as precisely as possible.
This was recommended to me by Rick Oliver and it seems to have worked a treat. Of course you'll only be able to tell for sure by checking with a balancer but they sound right to me.
If you either don't have a carb balancer, or you don't have the tools/skill to adjust the screws whilst the carbs are on the bike, you can do the following.
Take the carbs off the bike and observe the butterfly valve for carb 4. Adjust the idle screw for carb 4 until the butterfly valve reveals the first of the very small holes inside the carb. Adjust the idle screw it until all you can see of this first hole is a minuscule crescent. Adjust the screws for the other three carbs so that they match this crescent as precisely as possible.
This was recommended to me by Rick Oliver and it seems to have worked a treat. Of course you'll only be able to tell for sure by checking with a balancer but they sound right to me.