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Post by JonW on Jan 23, 2020 1:18:39 GMT 1
Has anyone seen this difference before to the inlet tract [1] restrictors? These are both from my stash of YPVS spares. Im wondering if one of these is a 51L version (the long one?) and the other is 29L. Any thoughts?    And... before you say one is cut down, look at the ends. they both have the thin strengthening bar moulded into place at the ends. 1 - On the day of Terry Jone's death its hard not to think of 'huge tracts of land' and smile. RIP Terry! |
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Post by jon on Jan 23, 2020 8:43:28 GMT 1
From memory I have only seen the short ones on the YPVS airboxes I’ve had.
I’ve never had a 51L, so that sort of reinforces your thinking?
Jon
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Post by midlifecrisisrd on Jan 23, 2020 9:05:32 GMT 1
The long is 29l, the short is 51l
Steve
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Post by Yogi on Jan 23, 2020 9:08:36 GMT 1
What Magoo said ☝️☝️☝️🤣
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Post by JonW on Jan 24, 2020 0:38:29 GMT 1
Oh cool. Thanks guys!
So I assume the 350 prefers the longer one for some reason. hmm... wonder why.
We used to take these out along with the snorkel back in the day as a 'performance mod'. But I do think they are a (anti?) resonance device and not actually a restriction, any thoughts?
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Post by midlifecrisisrd on Jan 24, 2020 10:56:19 GMT 1
Oh cool. Thanks guys! So I assume the 350 prefers the longer one for some reason. hmm... wonder why. We used to take these out along with the snorkel back in the day as a 'performance mod'. But I do think they are a (anti?) resonance device and not actually a restriction, any thoughts? Mutts tested it I'm sure and there was a gain binning them and upsetting a size I first noticed it on my n1 as it had the 51l All the lc2's had 29l I'm sure it's marked on the airbox itself which it is Feck knows what's on an f2 Steve |
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Post by Yogi on Jan 24, 2020 11:33:11 GMT 1
Oh cool. Thanks guys! So I assume the 350 prefers the longer one for some reason. hmm... wonder why. We used to take these out along with the snorkel back in the day as a 'performance mod'. But I do think they are a (anti?) resonance device and not actually a restriction, any thoughts? Mutts tested it I'm sure and there was a gain binning them and upsetting a size I first noticed it on my n1 as it had the 51l All the lc2's had 29l I'm sure it's marked on the airbox itself which it is Feck knows what's on an f2 Steve They are marked near the inlet rubbers 👍 if memory serves 🥴😱 |
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Post by JonW on Jan 24, 2020 12:43:04 GMT 1
Oh cool. Thanks guys! So I assume the 350 prefers the longer one for some reason. hmm... wonder why. We used to take these out along with the snorkel back in the day as a 'performance mod'. But I do think they are a (anti?) resonance device and not actually a restriction, any thoughts? Mutts tested it I'm sure and there was a gain binning them and upsetting a size I first noticed it on my n1 as it had the 51l All the lc2's had 29l I'm sure it's marked on the airbox itself which it is Feck knows what's on an f2 Steve Cool, seems like its a sound thing then. I'll think about the upjet and leave it out on my PWK carbed bike, the LC2 Im buidling now may as well have the 29L version in as its got OEM carbs and pipes. F2 is 51L according to the parts book. |
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Post by JonW on Jan 24, 2020 12:45:29 GMT 1
Mutts tested it I'm sure and there was a gain binning them and upsetting a size I first noticed it on my n1 as it had the 51l All the lc2's had 29l I'm sure it's marked on the airbox itself which it is Feck knows what's on an f2 Steve They are marked near the inlet rubbers 👍 if memory serves 🥴😱 Ahh, yes they are. Id forgotten about that. 29L for LC2 and 350 F1, but 51L engined F1 got the 51L type as did the F2. |
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Post by roach3 on Jan 24, 2020 15:08:09 GMT 1
in a slightly unrelated issue i had trouble with the reach with the airbox to carb rubber joints until i noticed another set i had were different shapes and lengths
or is it only me that didnt know this lol
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Post by JonW on Jan 24, 2020 23:09:32 GMT 1
in a slightly unrelated issue i had trouble with the reach with the airbox to carb rubber joints until i noticed another set i had were different shapes and lengths or is it only me that didnt know this lol Er, they are all the same 29L part number from 83 through the F2 (i didnt check the R but i bet its the same), maybe some were aftermarket tat? |
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Post by midlifecrisisrd on Jan 24, 2020 23:35:30 GMT 1
I've never found different ones but I've had some that seemed to have shrunk and were a bit short
Steve
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Post by roach3 on Jan 25, 2020 3:26:05 GMT 1
the one on the right was fitted to the bike maybe of an aircooled?
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Post by marrcel on Jan 25, 2020 8:33:33 GMT 1
Or someone made it fit to the pwk 55mm.
Boiling water and a beer bottle can do the trick.
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Post by bare on Jan 25, 2020 17:53:17 GMT 1
Do able but tricky.. as the result is that the Roundy middle part becomes convex /constricting.
Requiring an inner metal ring being fitted to enlarge the constriction.
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