Folks. Advice on which way to go from here please?
Stage 4 or 5 (whatever that means) piston ported 175 cast iron.
Phbh28 with breathe sweet filter
Gori 48mm (not the gp50 type)
Currently have
50 pilot
40 slide
Av264
X13 on top clip (leanest)
112 main.
Thanks
Phbh28 advice please
What's the problem?
I don't understand what "wot" is............
- drunkmunkey6969
- Moderator
- Posts: 2838
- Joined: Sun Jan 04, 2009 1:42 pm
- Main scooter: '69 Lambretta GP
- Location: North Yorkshire
- Contact:
Wide Open Throttle...
See our YouTube scooter channel for Tech-help: https://www.youtube.com/c/TheScooterFactory/videos
- drunkmunkey6969
- Moderator
- Posts: 2838
- Joined: Sun Jan 04, 2009 1:42 pm
- Main scooter: '69 Lambretta GP
- Location: North Yorkshire
- Contact:
I'm not a fan of top clip settings, at least try to get a half-clip spacer in there to take it to 1.5 clip setting. I'd also suggest you set pilot to 52, keep everything else the same and do plug chops to asses. Also, have you done a fuel flow check? Needs to be 1 pint per minute. Lastly, make sure the air filter is clean.. then try a brief road test/plug chop at WOT to see what difference having the filter on/off makes, this should give clues to suggest which direction you should go in...
See our YouTube scooter channel for Tech-help: https://www.youtube.com/c/TheScooterFactory/videos
-
- registered user
- Posts: 859
- Joined: Mon Jul 07, 2014 10:34 am
- Main scooter: lambretta li 125
- Location: Tyne and Wear
- Contact:
Thanks Dan. I did try a shim on needle, but it didn't like it. I'm thinking of using x7 but your words "deadly combination" are putting me offdrunkmunkey6969 wrote: ↑Mon Aug 31, 2020 12:56 pmI'm not a fan of top clip settings, at least try to get a half-clip spacer in there to take it to 1.5 clip setting. I'd also suggest you set pilot to 52, keep everything else the same and do plug chops to asses. Also, have you done a fuel flow check? Needs to be 1 pint per minute. Lastly, make sure the air filter is clean.. then try a brief road test/plug chop at WOT to see what difference having the filter on/off makes, this should give clues to suggest which direction you should go in...
I'm sure the breathe sweet is a really free flowing filter and is clean.
Probably best to leave as is until I (hopefully) get it on mick abbey's dyno later in the week. Then I'll try 52 pilot and x7.
- drunkmunkey6969
- Moderator
- Posts: 2838
- Joined: Sun Jan 04, 2009 1:42 pm
- Main scooter: '69 Lambretta GP
- Location: North Yorkshire
- Contact:
I would agree... the question is, at which RPM range and throttle opening position?
See our YouTube scooter channel for Tech-help: https://www.youtube.com/c/TheScooterFactory/videos
- drunkmunkey6969
- Moderator
- Posts: 2838
- Joined: Sun Jan 04, 2009 1:42 pm
- Main scooter: '69 Lambretta GP
- Location: North Yorkshire
- Contact:
I can't remember which video I expanded on that in, but I think I inserted the caveat of 'deadly combination...in anything other than a standard or low-performance engine running a clubman and a filter' - or at least words to that effect. It's in one of the 3 jetting videos.
So, basically, your engine is a) small CC at only 175, b) running a clubman, c) running an air filter, d) running the 28mm instead of the larger 30mm... so there is every chance an AV264 and X7 combo will work safely in those parameters. I'd just suggest that you 'pad out' everything around it first, to provide a safety cushion whilst you test and adjust... so make sure your mix screw is correct, pilot/main/clip are all rich.... then pop in the AV264/X7 combo and 'work backward'. Essentially, always go too rich first, and lean off carefully to suit.
With the AV264/X7 in place, you'll probably be able to go to either 2nd or 2.5 clip on the needle, a 52 pilot, and certainly keep the main you are running, or maybe even a slightly larger if it will take it? Don't forget to do a fuel flow test and pop in a new plug before the dyno, let us know how you get on.
See our YouTube scooter channel for Tech-help: https://www.youtube.com/c/TheScooterFactory/videos