leon51274
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| posted on 16/4/10 at 04:18 PM |
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Xflow
A couple of things for you experts to help me with.
Just fitted a set of dellorto dhla 40's and had my bosch dissy modified by h&h. I've had the engine running a couple of times and it
runs sweet, however trying to get it started is a first class pig, almost getting to the extent of running the battery flat but like i say when
running it runs fine, timing has been set at 14deg so i'm pretty sure i'm ok in that department.
The other thing, is while it isn't running i've got a fuel leak under one of the carbs where the throttle lingage enters the carb which if
you pull on the lever is fair p---ing out! If the engine is running there's no leak! Could this just be seal?
And advice is welcomed
Cheers
Leon
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norfolkluego
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| posted on 16/4/10 at 06:15 PM |
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Do you use the choke to start, my Crossflow had twin DHLAs and would never start without holding the choke open.
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02GF74
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| posted on 16/4/10 at 06:38 PM |
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what lever - you mean the one that pushes on the enrichment valve at the underside of the carbs?
sounds like the diaphragm has gone.
there is an art to starting a corssflow, as follows.
press the accelerator pedal fully down thre or 4 times - this pumps fuel via the enrichment device.
hold choke open - now this can be full/1/2 or a tiny amount depending on engine and air temp - you need to find out what this is for your engine.,
trun the engine over, push the accelerator down
bingo.
note that you may hear the engine cathcing - so push in or pull out the throttle - eventually you work out how much choke you need.
you must sort out that leak - or else ensure your insurance covers you for fire.
try static timing at 10 degrees,
[Edited on 16/4/10 by 02GF74]
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David Jenkins
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| posted on 16/4/10 at 08:51 PM |
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The "four pumps then crank" technique is fine if you've got a standard carb with an accelerator pump (e.g. the Weber 32/36 I used to
have) but it wouldn't help with my current set of bike carbs!
If the DHLA carbs have an accelerator pump then the technique may be OK, but if not then you're wasting time and effort. Proper use of the
choke is the best policy - and that depends on the carbs too! 
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norfolkluego
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| posted on 16/4/10 at 10:04 PM |
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Pumping the accelerator never worked with my Crossflow/DHLA (did with my Tiger Pinto with DCOEs), always had to use the choke.
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02GF74
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| posted on 17/4/10 at 12:40 PM |
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quote:
Originally posted by David Jenkins
If the DHLA carbs have an accelerator pump then the technique may be OK, but if not then you're wasting time and effort.
yes they do - I speak from experience 
some DHLA's yesterday. (accelerator pump and lever is in the middle of both carbs)
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leon51274
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| posted on 19/4/10 at 08:28 AM |
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quote:
Originally posted by 02GF74
quote:
Originally posted by David Jenkins
If the DHLA carbs have an accelerator pump then the technique may be OK, but if not then you're wasting time and effort.
yes they do - I speak from experience
some DHLA's yesterday. (accelerator pump and lever is in the middle of both carbs)
Thats where my fuel is leaking from! Its coming out from where the lever is. So is this the diaphram?
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