SU Carbs setup and Balance

SU Carbs setup and Balance

Postby bluebossa » Sat Apr 07, 2012 9:23 pm

Any tips on how to set-up and what do the limiters look like - they are referred to in the manual as being on until 1,000 km?

Bike starts fine but pickup up laboured even when warm.
Should I remove jets or leave alone?

Cleaned both floats and filters out and will tick over fine.
1981 Neval Dnepr MT10-36 2WD
1979 Land Rover Lightweight
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Re: SU Carbs setup and Balance

Postby happybiker » Sun Apr 08, 2012 1:33 am

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Last edited by happybiker on Thu Jan 09, 2014 8:06 pm, edited 4 times in total.
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Re: SU Carbs setup and Balance

Postby bluebossa » Sun Apr 08, 2012 9:41 pm

Strange even the original purchase receipt from Nevals states SU upgraded Carbs - are you saying this could be incorrect as I believe Neval performed this upgrade to 1980's Dneprs?
1981 Neval Dnepr MT10-36 2WD
1979 Land Rover Lightweight
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Re: SU Carbs setup and Balance

Postby jimmy62alan » Mon Jan 05, 2015 5:31 pm

Has anyone got any picture of the SU's fitted I have got a few SU carb in my spares box like
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Re: SU Carbs setup and Balance

Postby Luddite » Fri Jan 09, 2015 2:44 pm

No pic, I'm afraid, Alan, but I did have one fitted to my '80 MT10/36.

Basically, the twin carbs are dumped, and a single SU is fitted to a specially cast adaptor which fits on the top of the gearbox in place of the air filter. The SU is bolted to this. This leaves no room for a battery, and very little room for an air filter. As an outfit, my battery was bodged into the sidecar boot. I found a slightly-modified (with a hammer) Morris Minor filter fitted very well indeed.

Whilst the SU can be made to work well with a fair bit of fiddling, it is very prone to icing due to the long inlet tract keeping the carb away from any warmth. Mine was worst on summer mornings, when I would only get about five miles before having to stop for a melt. My Dnepr was fitted with a remote-chamber SU from new, but the integral-chamber HIF (stolen from a Metro) worked better for me.

I'm in two minds as to whether this is a worthwhile mod at all, any advantage from having just the one carb is negated by the icing and the filter/battery issue. The SUs are getting old now, too. Are the standard carbs actually enough of a problem to warrant change?
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