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carbs, tuning, rebuilds, tears (LMIV)

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Falcone
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bentombed Quote  Post ReplyReply Direct Link To This Post Topic: carbs, tuning, rebuilds, tears (LMIV)
    Posted: 09 Mar 2019 at 03:18
I have been working on the tuning and running of my 87 LMIV- when i got it a few months back it was still stock, it ran ok but lacked lower midrange bite. 

 i have upgraded the pipes which made a massive difference and now i  have been playing with different carb settings to get the most out of the motor.  I havent done anything to the accelerator pumps, the plan is to shut them off. 

for the tune I am aiming to use the guzzitech/ed milich recipe.
in the bike currently
 50/3 slides, 
K4 needle - middle clip
265ab atomiser
128 main
65 pilot


it has not been working that well  - i discovered that the left side choke doesnt seal properly which i think is letting in extra air or fuel and messing it all up.  an no matter what i do it runs rich. 

two questions

so, can i rebuild the lever and replace the oring or do i need to get a replacement? 

and two - where have i gone wrong with my jetting and needle slide combo?

any help is greatly appreciated.  the bike goes well, i just know it can go better.

cheers
ben 
ride fast, live slow
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TheWrongTrousers View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TheWrongTrousers Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 07:33
In the unlikely event that you draw a blank here, you could do a lot worse than give Paddy a ring. He is very knowledgable and if you need any bits he has got lots.

Serenity Now !!*!**!!
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ranton_rambler View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote ranton_rambler Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 08:44
Leaky cold start plungers leading to rich running are quite common, but Eurocarb sell replacements. Not too expensive. If they're cable operated it's worth checking the cables have some slack in the "off" position.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bentombed Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 09:14
Originally posted by ranton_rambler ranton_rambler wrote:

Leaky cold start plungers leading to rich running are quite common, but Eurocarb sell replacements. Not too expensive. If they're cable operated it's worth checking the cables have some slack in the "off" position.

that makes perfect sense - i checked over the choke lever and the oRing is all mashed and only visible on one side.  I will make an order. thank you.
ride fast, live slow
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Brian UK View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 09:19
The other thing is the atomiser jets. They wear oval with the needle flapping in them. On my V50 you could actually see they were not round just by looking through them. That ran rich too.
Changing them made quite a difference.

There is also a Dellorto tuning guide  uploads/6/dellorto_tuning_guide.pdf which might help.
Brian.

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Falcone
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bentombed Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 09:24
Originally posted by Brian UK Brian UK wrote:

The other thing is the atomiser jets. They wear oval with the needle flapping in them. On my V50 you could actually see they were not round just by looking through them. That ran rich too.
Changing them made quite a difference.

There is also a Dellorto tuning guide  uploads/6/dellorto_tuning_guide.pdf which might help.

thank you - the atomisers are brand new,  i feel that tuning guide is the thing that i need.  champion. 
ride fast, live slow
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