Vespa Tuning Project.....

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Jack221
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Dan, Well done with the torque increase exactly where you need it!
What are your final port durations? And what about the jetting set up of your VHSH?

On my VHSH30CS I realised it wasn't running richer no matter how big the main jet, the DQ268 and K21 needle were not opening far enough at WOT. I had a spare K3 needle (1.5mm tip) so put that in on top clip and it was a bit spluttery at low rpm but high rpm jetted in well with a 160 main jet. Now really strong at high rpm again. I'm thinking a K31 should fix the low rpm running. Very interested to see what you have in yours :roll:
Vespa est ieiunas, quia semper operaturi
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Spanish Fly
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Looks like you got a good result there.
Did you try lengthening the pipe with a sleeve?
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drunkmunkey6969
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Spanish Fly wrote:Looks like you got a good result there.
Did you try lengthening the pipe with a sleeve?
Had a sleeve made, just need to get round to trying it on the dyno etc.......
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drunkmunkey6969
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Jack221 wrote:Dan, Well done with the torque increase exactly where you need it!
What are your final port durations? And what about the jetting set up of your VHSH?

On my VHSH30CS I realised it wasn't running richer no matter how big the main jet, the DQ268 and K21 needle were not opening far enough at WOT. I had a spare K3 needle (1.5mm tip) so put that in on top clip and it was a bit spluttery at low rpm but high rpm jetted in well with a 160 main jet. Now really strong at high rpm again. I'm thinking a K31 should fix the low rpm running. Very interested to see what you have in yours :roll:

I'll check on Monday when im back at work and let you know the carb settings........
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Adam_Winstone
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Was this jetting ever confirmed? I ask as I too am in the situation of trying to jet a 30 VHSH and have found that many of the recommended needle and atomiser combos become a restriction to main jet flow, hence some places recommend a 130-140 main, whilst others are recommending 170+. It is the larger MJ recommendations that I'm finding are limited by needle tip/atomiser.

I'm happy to keep plugging away/adjusting/testing myself, however, it is interesting to see what others have already done.

Ta

Adam
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drunkmunkey6969
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Adam_Winstone wrote:Was this jetting ever confirmed?
All info on the dyno at Ripon and im not back there till Saturday now, will check then and post (unless i forget, which is highly likely - so keep pestering me! lol) :D
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Adam_Winstone
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Will do.

Ta
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Adam_Winstone
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Forgot the reminder yesterday :(
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drunkmunkey6969
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Sorry. Lol. Monday definitely!!
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Adam_Winstone
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BUMP ;)
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