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Post by billbott on Jun 28, 2013 23:13:05 GMT 1
Ok boys.
I feel my Dt isn't making me suicidal enough, so am gonna take off my ultra reliable 250 top end and fit a 350....
Quick question: what main jet, emulsion tube, pilot and needle position and type should I start with?
Standard porting, air box with Gibson race pipes.
Cheers
Bill
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Post by bare on Jun 29, 2013 3:24:24 GMT 1
Take the numbers right out the 31k Manual, Haynes even.
Pipes are after the combustion and have less real world effect on mixture than many claim.
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Post by billbott on Jun 29, 2013 8:38:02 GMT 1
Yes, that's what I'm after but have no 31k info! Take the numbers right out the 31k Manual, Haynes even. Pipes are after the combustion and have less real world effect on mixture than many claim. |
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Post by garyt on Jun 29, 2013 8:53:27 GMT 1
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Post by billbott on Jun 29, 2013 22:33:57 GMT 1
Cheers yet again, Gary Either you've a great memory or you need to get out more! |
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Post by billbott on Jul 7, 2013 11:26:01 GMT 1
Just readthe info given, but it makes no mention of the emulsion tube size? I think I have a mis matched pair too....
Can someone with a 31k haynes manual please fill in the info I need below:
31K YPVS:
Main jet:
Air jet:
Needle:
Clip from top
Pilot jet
Air screw **** turns out
float height
Emulsion tube:
Thanks in advance.
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paulo
Thrash Merchant
Posts: 406
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Post by paulo on Jul 7, 2013 13:26:18 GMT 1
Hi M8, 31K carb data below:-
Main 240
Air 0.7
Jet needle 5K1
Clip position 4th from top
Throttle slide 2.0
Pilot 22.5
Air screw 1 1\4 turns out
Float height 21 +/- 0.5mm
Idle speed 1200 +/- 50rpm
Needle jet not listed but both my sets of 31K carbs have 345 P-0 fitted.
Hope this helps !.
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Post by billbott on Jul 7, 2013 15:54:04 GMT 1
Paulo, thats brilliant, thank you.
One of mine has a 345 P-0 the other is unmarked, maybe from a ledar kit so looks like i need another 345 P-0
One more thing, seeing as you have more than one set...
The non choke side body has two drillings above the inlet to the rubber manifold. one has a brass plug, the other does not, but they are both plugged on the choke side - is yours the same?
Thanks.
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paulo
Thrash Merchant
Posts: 406
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Post by paulo on Jul 7, 2013 18:31:14 GMT 1
Hi M8 here's a photo of the non choke carb - is it the area to the top of the airfilter side ?. Non carb side has no hole for either. Choke side has a hole and a brass blanking ball fitted. To the bottom of the inlet there are x2 holes blanked off with brass balls and a hole where you can see the side of the air screw - both carbs are the same in this area. Attachments:
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Post by billbott on Jul 7, 2013 18:52:19 GMT 1
Paulo
Perfect mines the same!!!!!
Thanks again for your help!!
Just need a needle jet now
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Post by dazzard on Aug 8, 2013 21:20:48 GMT 1
did it work out ok?
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