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JimM

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Reply with quote  #1 
Hi all,

What is the maximum fuel pressure that can be applied to R1 Bike carbs before it has an impact on performance / operation of carb   ....  flooding etc

cheers
Jim.

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Carnoustiecat

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Reply with quote  #2 
Hi Jim
           Bike carbs usually only require about 2 - 3 psi maximum, if the pressure is to high the fuel will bypass the float needle valves.

Hope this helps.

Scott

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JimM

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Reply with quote  #3 
Hi Scott,

Have had some problems with fuel blow back thru the carb inlets resulting in fuel stains along the outer panel.
Also very strong smell of fuel under hard acceleration or when climbing steep hills.
During discussion with other owners, it was suggested that the pressure could be reduced to 1.6psi.
Pressure was reduced and it has make an impact on the blowback problem.

However, on a run to Braemar last week, climbing the hill to Glenshee ski slopes the Cat struggled.
Was down in 3rd gear with max 55mph .... believe fuel starvation being the issue. (plenty fuel in tank)

So ... low pressure - problem on steep hills / hard acceleration, high pressure - problem with blowback / under acceleration.

Would it be possible to book my Cat into your shop for a service on the R1 Carbs that are on my Tiger?
Some Saturday morning ...

Based on your feedback, probably a setting of 2.5 Psi would be the better setting (once carbs are checked / serviced).

Jim.



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Carnoustiecat

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Reply with quote  #4 
Hi Jim
          Sorry haven't been near my computer for a few days. The shop door isn't wide enough to get a car through as it was only ever meant to get motorbikes in.
One thing you could check with out to much hassle, if you remove your air filter so that you can see down the throats of the carbs, start the engine and have a look where the slide needle goes into the main jet, if you can see fuel running out of the main jet past the throttle slide needle, chances are your needing to replace the float needle valve assembly (that's the float valve and the brass part in the carb body that it seals on including the o ring that seals it) These o rings are guilty of letting fuel past.
If this is the problem it will be quite obvious as the fuel runs in a constant flow rather than just a fine mist.

Hope this helps

Scott

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Carnoustiecat

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Reply with quote  #5 
Hi Jim, meant to say if it is this, it's more than likely that it will only be one carb that's doing it so it will be easy to spot as the rest will look quite dry compared to the problem one. Like I said easy to check, you might want to shine a torch down the carbs just to make it easier to spot.

Scott

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