scutter
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| posted on 30/1/06 at 11:57 PM |
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What's this for?
Ok, there's a mystery pipe on my Dellorto DHLA "H" carb's (circled in green) and it's caused my No. 1 spark plug to burn out,
this obviously isn't good
So that do you think it's for? and can I just blank it off and replace to plugs, I may boroscope the engine to check for damage but would love
to use it this weekend.
ATB Dan.
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MkIndy7
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| posted on 31/1/06 at 12:08 AM |
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At a rough guess i'd say a Vaccume take off for either Servo Brakes or Vaccume advance maybe.
If its been sucking fresh air in there then that would make the mixture lean and thus burn the plug and probably a valve.
not very difinitive but an answer all the same at this time of night!
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C10CoryM
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| posted on 31/1/06 at 12:17 AM |
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Ya, what he said. 
Its a vacuum nipple that only draws vacuum from one cylinder. Meaning that it will only suck in a bunch of air and lean out one cylinder.
Plug it off, replace the spark plug and fire it up.
If it runs on all 4 holes you are fine. You may have to adjust the carbs and then just drive it. If #1 is not firing, or it backfires out the
intake or exhaust you have a burnt valve and the head has to come off.
Good Luck.
"Our watchword evermore shall be: The Maple Leaf Forever!"
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Fozzie
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| posted on 31/1/06 at 12:27 AM |
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Yup Dan as the 2 above replies, its running lean on that cylinder, block it off.
Fozzie 
'Racing is Life!...anything before or after is just waiting'....Steve McQueen
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scutter
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| posted on 31/1/06 at 10:27 AM |
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Cheers folks, I'll get a new set of plugs, looks like a journey into work this evening.
ATB Dan.
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