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Post by gazzatt2 on Feb 21, 2013 22:28:30 GMT 1
thinking of fitting a set to my 350LC 4l0
any one got a starting point for jetting
I am running with foam air filters
cheers
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Post by muttsnuts on Feb 22, 2013 22:07:29 GMT 1
start with the stock jetting for an E/F, so 145 mains and 25 pilots, needle mid position would be a good starting point, air mixture screw 1 1/2 turns out
Why fitting them?, I am after a set of 2R9 carbs !! - you don;t want to swap for a set of 4L0 01 carbs do you ?
HTH
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Post by oldelsieboy on Feb 22, 2013 22:59:31 GMT 1
start with the stock jetting for an E/F, so 145 mains and 25 pilots, needle mid position would be a good starting point, air mixture screw 1 1/2 turns out Why fitting them?, I am after a set of 2R9 carbs !! - you don;t want to swap for a set of 4L0 01 carbs do you ? HTH Coz they are 28mm compared to 26mm standard. OEB |
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Post by gazzatt2 on Feb 23, 2013 22:06:06 GMT 1
as OEB say bigger size
and i understand its a popular mod to do
my LC has an unknown tune on it as well and I think
it would run better with larger carbs
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Post by muttsnuts on Feb 23, 2013 22:15:45 GMT 1
start with the stock jetting for an E/F, so 145 mains and 25 pilots, needle mid position would be a good starting point, air mixture screw 1 1/2 turns out Why fitting them?, I am after a set of 2R9 carbs !! - you don;t want to swap for a set of 4L0 01 carbs do you ? HTH Coz they are 28mm compared to 26mm standard. OEB ;D should have stated my comment better !, appreciate they are 28mm and not 26mm, what I was querying was why did he want biegger carbs on, but Gaz has answered it now, he has an unknown tune on it - yes it is a fairly common mod if you can get hold of the 2R9 carbs, there as rare as the PWK's these days ! I need a set of 2R9's for an RD400F I am building....... anyway, stock jets to start with will be fine until you get a datum on how its running and what combination of pipes, air filter, tuned barrels, head etc |
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Post by loctite on Feb 23, 2013 23:05:29 GMT 1
[i need a set of 2R9's for an RD400F I am building.......
+1
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Post by muttsnuts on Feb 24, 2013 11:17:23 GMT 1
I do know of how to get around the 2R9 issue, if all you want is some carbs to get it all running (identical size and make of carb), if that's all your after I can tell you how to do that, but if you want 2R9 carbs specifically like for a standard resto/build then your stuck like me at the moment !
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Post by 4ce on Feb 24, 2013 20:07:38 GMT 1
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Post by loctite on Feb 24, 2013 20:38:21 GMT 1
i have the earlier carbs 1a3- i believe its been a while since i seen them,have been waiting for exhausts to come along at an affordable price,it will be cheaper to get aftermarket ones made of gold,,lol
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Post by gazzatt2 on Feb 24, 2013 23:51:21 GMT 1
I am open to suggestions of any other carbs to use
I do realise how rare the 2r9's are
It's just that I have a set
I also have the 2r9 exhausts but will put them back on
when
I restore my 400F
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Post by muttsnuts on Feb 25, 2013 20:20:58 GMT 1
you can use the 1A3's and also the 2R8's (250E/F) carbs, just put 2R9 internals in, so needle and needle jet, pilot and main, the only difference betweent he 21R8's and the 2R9's is the air correction jet, its slightly bigger on the 2R8's, but it doesn't make any material difference on the bigger engine
If you do the Dale A mod then using the 1A3's or the 2R8's is the better way to go as they are more readily available and alot cheaper generally.
I have a set of 1A3's but I need some 2R9's for a bike I am restoring for somebody, hence why I need some - happy to do a swap with some cash your way.......
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Post by gazzatt2 on Feb 26, 2013 21:16:17 GMT 1
you can use the 1A3's and also the 2R8's (250E/F) carbs, just put 2R9 internals in, so needle and needle jet, pilot and main, the only difference betweent he 21R8's and the 2R9's is the air correction jet, its slightly bigger on the 2R8's, but it doesn't make any material difference on the bigger engine If you do the Dale A mod then using the 1A3's or the 2R8's is the better way to go as they are more readily available and alot cheaper generally. I have a set of 1A3's but I need some 2R9's for a bike I am restoring for somebody, hence why I need some - happy to do a swap with some cash your way....... have you done the Dale A mod ? |
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Post by gazzatt2 on Mar 1, 2013 20:41:19 GMT 1
bump
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Post by muttsnuts on Mar 2, 2013 11:06:04 GMT 1
Hi Gaz, yes, I've done it on one bike, it works very well, but you DO have to get all of the parts recommended and do all of the mods, picking and choosing doesn't work as I found out, its all or nothing for the mod including the Y boot and large K&N filter
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Post by gazzatt2 on Mar 2, 2013 11:21:57 GMT 1
I have the y boot ;D
I won't do it to a set of 2r9's though
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Post by muttsnuts on Mar 3, 2013 15:30:07 GMT 1
yeah, do it to a set of 1A3's and use 2R9 internals and it will work a treat, or use 1A3 and its internals and mofiying the jetting accordingly
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hazey
Thrash Merchant
Posts: 391
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Post by hazey on Mar 3, 2013 16:04:35 GMT 1
Done the full dale a mod to a set of 2r9s which transformed my 400f  I was lucky to come across a set of spare 2r9s some years ago from a local breakers who dident know what they were off  so can go back to stock if req |
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Post by gazzatt2 on Mar 3, 2013 20:30:10 GMT 1
did you bore the Venturi ?
did you use the jets that F freist recommends ?
dont fancy doing the drilling for the air jet !!
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hazey
Thrash Merchant
Posts: 391
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Post by hazey on Mar 3, 2013 22:36:01 GMT 1
did you bore the Venturi ? did you use the jets that F freist recommends ? No i dident bore the carbs. needles,emullsion tubes as per mods,drilled air jet to 2mm,30 pilot,210 mains. 1.8 BTDC, larger dia stingers in large can allspeeds,Harry barlow fast road tune.single petal reeds in opened up lc cages with one of harrys boost bottles. next stage is to sort the squish . |
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Post by gazzatt2 on Mar 5, 2013 21:43:18 GMT 1
did you drill and tap to take 2.00mm jets or just drill carb to 2.00mm ?
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hazey
Thrash Merchant
Posts: 391
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Post by hazey on Mar 5, 2013 22:02:16 GMT 1
did you drill and tap to take 2.00mm jets or just drill carb to 2.00mm ? Just drilled air jet to 2mm |
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Post by mullinsm1962 on Oct 15, 2024 18:19:42 GMT 1
you can use the 1A3's and also the 2R8's (250E/F) carbs, just put 2R9 internals in, so needle and needle jet, pilot and main, the only difference betweent he 21R8's and the 2R9's is the air correction jet, its slightly bigger on the 2R8's, but it doesn't make any material difference on the bigger engine If you do the Dale A mod then using the 1A3's or the 2R8's is the better way to go as they are more readily available and alot cheaper generally. I have a set of 1A3's but I need some 2R9's for a bike I am restoring for somebody, hence why I need some - happy to do a swap with some cash your way....... Sorry to revive this after all this time, but if you use the 2r8's and the 2r9 internals do you still use the balancing pipe between the inlet rubbers or not? I believe that if you're using the 1A3's you need to use the correct rubbers or the jetting is wrong. Does the same apply to the 2r8's? |
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so can go back to stock if req 