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Weber spacer.... Quickie...

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Weber spacer.... Quickie...
#1
  This topic is about my 1978 Triumph 1500
TheZster Avatar
TheZster Steven Z
SAINT LOUIS, MO, USA   USA
1978 Triumph 1500 "BLK-BRY"
I shoulda known better.... working on the starting/idling issues on the Weber..... Either won't start when cold - or won't start when warm... I can have one or the other....

so - today, I'm piddling around - (currently runs good hot, but won't start cold).... and find the carb bolt is loose.... tighten it up - and the rpms increase noticeably.... (which is opposite of what I would expect from a minor vacuum leak) The 1/4" spacer under the carb is showing some wear.... I'm not going to worry about tuning the carb until I get all the potential leaks resolved....

The question is - do I need buy a new spacer.... or is it superfluous? I don't see any linkage issues without the spacer....

I've got a new 4/2/1 header on order - so I can change the exhaust/intake manifold when I make the swap - then eliminate all the other potential issues....

Also rethinking the crank vent that I ran into the intake manifold via a 1/16 orifice from the valve cover.... Closing it off results on lower rpm (naturally)... Maybe I should move to a breather/vent/vapor canister.... (fix one issue - create another one).... h,mmmmmmm


thoughts?

Z

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Doug in Vegas Avatar
Doug in Vegas Douglas D
Las Vegas, NV, USA   USA
All bets are off with a loose carb. Clamping it down can increase flow and thus draw more fuel or simply less air. Adjustment follow regardless when you find and plug a vacuum leak.

TheZster Avatar
TheZster Steven Z
SAINT LOUIS, MO, USA   USA
1978 Triumph 1500 "BLK-BRY"
I agree 100%.... and was embarrassed to admit it.... as I just rebuilt the carb and had the nuts down securely last week (or so I thought).... I think the spacer is shot....

Z

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Doug in Vegas Avatar
Doug in Vegas Douglas D
Las Vegas, NV, USA   USA
By "spacer" do you mean the insulator between the carb and the manifold?

TheZster Avatar
TheZster Steven Z
SAINT LOUIS, MO, USA   USA
1978 Triumph 1500 "BLK-BRY"
Yep.... and by you using the term "insulator".... makes me think it's not an option - as the manifold is so close to the exhaust.... {ffffttttt)

Doug in Vegas Avatar
Doug in Vegas Douglas D
Las Vegas, NV, USA   USA
In reply to # 1512018 by TheZster Yep.... and by you using the term "insulator".... makes me think it's not an option - as the manifold is so close to the exhaust.... {ffffttttt)

Fine sandpaper on a flat surface can cure minor imperfections.

A gasket on either side should take care of any leaks. A little soft permatex form-a-gasket and you should be fine.

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