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mikegray660
Joined: 05 Nov 2006
Posts: 110
Location: Long Island NY (ughhhh)
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 Posted: Sat Jun 28, 2008 2:55 pm Post subject: Mikuni jetting: sudco vs victory publication |
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Hey all
long time no talk - been mucking with my mikuni settings on my 850 - not sure why as bike ran OK, but was bored, and found that the "prejetted" mikuni 34 VM as supplied by Sudco has different base/supplied jetting including a different slide cut away (2.5) than the victory library mikuni publication (panics?) recommendations. Sudco stock is 240 main, 35 pilot and 2.5 throttle cut away - victory states for 34VM carb 20 pilot 3.0 cutaway and 260 main.
just wondering if the sudco is more of a generic setup and panics is what is best (or at least a better starting point)
reason i'm asking as i can chnage all the jets to either setting, but wonder if purchasing the 3.0 cutaway would make the bike run better??
any thoughts - and please don't say get a Amal -(beat you to it!)
thx!
Mike  |
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panic
Joined: 20 Sep 2005
Posts: 53
Location: Hempstead, New York
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| Posted: Sun Jun 29, 2008 8:45 am Post subject: |
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If the gas mileage and response are both good leave it alone.
IMHO 2.5 is generally more rich than you need for an 850, but individual engines & riders vary. |
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mikegray660
Joined: 05 Nov 2006
Posts: 110
Location: Long Island NY (ughhhh)
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| Posted: Sun Jun 29, 2008 10:28 am Post subject: |
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| panic wrote: | If the gas mileage and response are both good leave it alone.
IMHO 2.5 is generally more rich than you need for an 850, but individual engines & riders vary. |
thx Panic! |
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arch
Joined: 22 Jul 2004
Posts: 31
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| Posted: Wed Jul 02, 2008 4:47 pm Post subject: |
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| How do the plugs look? |
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mikegray660
Joined: 05 Nov 2006
Posts: 110
Location: Long Island NY (ughhhh)
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| Posted: Thu Jul 03, 2008 3:39 pm Post subject: |
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| arch wrote: | | How do the plugs look? |
plugs always pretty good, nice toasty brown/tan - but acceleration seemed a bit flat, though it might of just been from 1 carb as opposed to two - and it was really cold blooded when first started
i ended up raising the needle clip by 1 notch in the sudco setup and put a slightly larger pilot in - less cold blooded at startup and seems to accelerate a little better (maybe....), but pops/coughs a little occasionally (once every 10 or sotimes) if i blip the throttle while at idle |
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BrianK
Joined: 14 Jun 2007
Posts: 386
Location: Boston, MA USA
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| Posted: Tue Jul 08, 2008 11:19 am Post subject: |
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| Maybe I'm being too literal, but if you raised the needle CLIP, you lowered the needle itself, making your jetting leaner, not richer. Is that what you intended to do? Is that in fact what you did, or did you mean you raised the needle (by lowering the clip)? |
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mikegray660
Joined: 05 Nov 2006
Posts: 110
Location: Long Island NY (ughhhh)
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| Posted: Tue Jul 08, 2008 1:48 pm Post subject: |
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| BrianK wrote: | | Maybe I'm being too literal, but if you raised the needle CLIP, you lowered the needle itself, making your jetting leaner, not richer. Is that what you intended to do? Is that in fact what you did, or did you mean you raised the needle (by lowering the clip)? |
nope I made it a little leaner as i mentioned - seemed like engine ran a little rich (since the cut away on the slide supplied by sudco was less (2.5) than recommended by panic's info (3.0) = meaning a little richer running in the lower throttle range.
not really sure how much a difference it made - but is a 1 kicker for most time cold/hot and accelerates smoother |
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At the end of 1967 the Norton Commando was announced.
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