Modern Vespa : Drilling a carb. Is it worth doing.

Drilling a carb. Is it worth doing.

OP shepys UTC details Hooked Vespa T5 classic 1994 and 1980 Vespa p200e Joined: UTC Posts: 396 Location: Burnham on sea, Somerset England
OP shepys Hooked Vespa T5 classic 1994 and 1980 Vespa p200e Joined: UTC Posts: 396 Location: Burnham on sea, Somerset England	UTC quote Hi guys Is it worth drilling a SI24/24G float chamber on a Vespa T5 with a malossi 172 kit when the engine hasn't been ported.

roland87 UTC details Molto Verboso '13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S, '82 PK 50 S Joined: UTC Posts: 1621 Location: Ukraine. Kyiv.
roland87 Molto Verboso '13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S, '82 PK 50 S Joined: UTC Posts: 1621 Location: Ukraine. Kyiv.	UTC quote Absolutely yes.

OP shepys UTC details Hooked Vespa T5 classic 1994 and 1980 Vespa p200e Joined: UTC Posts: 396 Location: Burnham on sea, Somerset England
OP shepys Hooked Vespa T5 classic 1994 and 1980 Vespa p200e Joined: UTC Posts: 396 Location: Burnham on sea, Somerset England	UTC quote Ok thanks. There's videos of it what I've been told so look for them to help me.

orwell84 UTC details Ossessionato Joined: UTC Posts: 3852 Location: northern New York
orwell84 Ossessionato Joined: UTC Posts: 3852 Location: northern New York	UTC quote shepys wrote: Ok thanks. There's videos of it what I've been told so look for them to help me. I used this to one.

OP shepys UTC details Hooked Vespa T5 classic 1994 and 1980 Vespa p200e Joined: UTC Posts: 396 Location: Burnham on sea, Somerset England
OP shepys Hooked Vespa T5 classic 1994 and 1980 Vespa p200e Joined: UTC Posts: 396 Location: Burnham on sea, Somerset England	UTC quote orwell84 wrote: I used this to one. I watch him a lot

OP shepys UTC details Hooked Vespa T5 classic 1994 and 1980 Vespa p200e Joined: UTC Posts: 396 Location: Burnham on sea, Somerset England
OP shepys Hooked Vespa T5 classic 1994 and 1980 Vespa p200e Joined: UTC Posts: 396 Location: Burnham on sea, Somerset England	UTC quote This one is good for float chamber

chandlerman

UTC

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63 GL, 62 VBB, 05 Stella, 66 Smallstate, 66 Lammy S3, 63 Lammy S3 Riverside

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chandlerman

Innovator

63 GL, 62 VBB, 05 Stella, 66 Smallstate, 66 Lammy S3, 63 Lammy S3 Riverside

Joined: UTC
Posts: 11581
Location: Nashville

17 Days Since Last Explosion

UTC quote

Depending on how certain you want to be about your carb flow, there's actually three places you really need to drill:
1) The float bowl passage, which everyone knows about
2) The opening from the banjo into the float filter chamber
3A) Chamfer the float needle passage at the top
3B) Drill the float needle seat and swap to a larger float needle

1, 2, and 3A are all easy and no reason not to do.

3B needs a 4.4mm float needle (SIP have them) and you'll need to make sure there are no burrs on the needle seat. It's also the least significant because it has the largest stock flow.

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