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 Carburation Help

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Nigel




PostSubject: Carburation Help   Mon Aug 08, 2011 7:56 pm

Hi,

I have a late Series 1 which is fine apart from, what appears to be, poor carburation.

The symptoms are:
1. It takes absolutely ages warm up and if you touch the throttle in the first few minutes on choke it will just die
2. Once underway, until it is thoroughly warm (2 or 3 miles), it just feels a bit rough and will and as if the carbs are badly set up
3. When it is thoroughly warm it runs ok, still has the poor carburation symptoms but much much less
4. When warm, it idles well and will pull all the way through the rev range strongly - just not always 'cleanly'

Before I start fiddling around with the carb, does anyone have any ideas, suggestions or general information please?


Regards,

Nigel
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atlas600gespann




PostSubject: Poor Carburation   Tue Aug 09, 2011 8:18 am

Hallo Nigel!

It seems as if your Dellorto is not equipped with the correct jets. Try this: Idle jet 58, main jet 162, mixture screws 15 half turns out. That should help.

I assume the carburettor is totally clean inside.

Regards

Thomas
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Nigel




PostSubject: Re: Carburation Help   Tue Aug 09, 2011 7:27 pm

Hi Thomas, thanks for the quick reply and the suggestion.

I haven't opened up the carbs yet as I was assured by the dealer that they had done all the necessary work cleaning and setting it up - but it is clearly not right.

I'll open it up and check what I've got inside and report back.

Thanks,

Nigel
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Frank

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PostSubject: Re: Carburation Help   Mon Sep 19, 2011 10:47 pm


Hoi,
I have a big problem with the Carbs!!
every ride the jets are getting dirty!!!
Who has experiance with that problem?
Different timesw i cleaned the Carbs but every time one of the jetts is getting dirty and the bike runns on one cylinder.

Frank Holland


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FRRRanky

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PostSubject: Re: Carburation Help   Thu Sep 22, 2011 11:33 pm

Frank wrote:

Hoi,
I have a big problem with the Carbs!!
every ride the jets are getting dirty!!!

Hi Frank
what kind of dirt? Dust? Sand?
Do you use fuel filters between the tank and the Dellortos?
Frank
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Frank

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PostSubject: Re: Carburation Help   Fri Sep 30, 2011 9:41 pm

Hoi,
i have had fuelfilters between the tank and carb. but is did'nt help.
even i filtered the hose from the choce! and even above the left intake from the carb is a hole what comes out in the room with the jetts.
also there i made a filter.
tomorrow i tried again.

greetings Frank Holland
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tom eatman




PostSubject: Re: Carburation Help   Tue Oct 04, 2011 7:45 am

Adding fuel filters sometimes helps to alleviate the problem but isn't actually going to cure it. The unleaded fuel tends to react with water (condense water in the tank while sitting over winter, for example) creating a very fine, rust colored, and sandy residue. These particles easily go past the filters mounted on the fuel taps and also make their way through just about everything. My suggestion is to thoroughly clean out your tank and the carb body before doing anything else. Yes, the jetting is a bit off (some bikes are more finicky than others) but if the basics aren't in order you are just going to be running around in circles!

Since you have already had the bike once in a workshop and your problems persist I would suggest you try to have a look yourself. This isn't rocket science and if you have the basic tools available and don't suffer the "Two Left Hands" disease you'll be OK. Start with the tank first. Empty whatever fuel is in there and then remove the fuel taps. If the filters are full of crud then the problem is fairly obvious. You can remove the filters from the tap assembly very carefull and gentle turning (the plastic filter is threaded). Pour in a liter or so of fuel, swirl the stuff in the tank a few times, and then drain into a clean container of some sort. This way you see what actually comes out. Once you are happy that the tank is clean put everything back together and have a look at the carb. To do this properly you'll have to take the carb out. Besides just removing all of the obvious screws and cables I've found removing the four M6 screws from the back of the carb assembly where the flange for the airbox rubbers attach and the M6 screw holding the flange attachment arm to the frame (gives you a bit of wiggle room) helps simplify life. This way you can easily slide the carb body straight out from the right side of the bike without having to fumble with getting the rubber bits seated again. There is a thick paper gasket between the flange and carb so go slowly. The carb removal takes all of five minutes and looks more complicated than it is. Clean as necessary.

Tom
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