Scott,
As I re-read your original post and the various replies and suggestions, I
believe most everyone mis-read what you actually wrote. You described a
piston with a spring loaded pin in it, not a carb body with a spring loaded
pin. As such, this pin is not there to raise the piston for mixture checking
purposes. It is, in fact, as you surmised, a sort of shock absorber to stop
the piston coming down with a resounding thunk.
It is true that you have mis-matched pistons, as only one piston has this
pin, but that fact presents a problem only if the weights of the two pistons
are different. By itself, the difference in design should not affect
anything as far as your being able to synchronize the idle speed or mixture.
When the engine is running, the piston will be lifted by the incoming air
flow at least as far (and probably a little further) than that pin will
raise the piston.
I'd suggest that you determine whether your two pistons weigh the same. If
they don't, check with someone who has a stock of H2 pistons and try to
match one or the other of the two that you have, to get a pair. Then, with
matching needles correctly installed, unworn jets, correctly-set float
heights and properly synched airflow and mixture, you should have no further
carb problems.
Lawrie
British Sportscar Center
-----Original Message-----
From: Scott Allen <scottinarl@hotmail.com>
To: mg-t@autox.team.net <mg-t@autox.team.net>
Date: Saturday, January 05, 2002 7:50 PM
Subject: Re: TD Carb Question
>Hi Terry,
>
>Problem is the pin does not go through the carb body. It is inaccessible
>when the carb is fully assembled, nor is there a slot or hole for it to go
>in so it can fit flush.
>
>Perhaps the piston is mis-matched with the carb body and I have one that is
>supposed to be used with a carb that has an external pin to check the
>mixture?
>
>My thought/worry is that since it does not fit flush I'll have use the
>mixture to compensate for it as it'll want to run lean?
>
>Thanks,
>
>Scott
>
>>From: TATERRY@aol.com
>>To: scottinarl@hotmail.com
>>Subject: Re: TD Carb Question
>>Date: Sat, 5 Jan 2002 22:36:58 EST
>>
>>In a message dated 1/5/02 16:20:56 Pacific Standard Time,
>>scottinarl@hotmail.com writes:
>>
>><< Should I worry about this? Should I have him shave the pin down so
that
>> it's flush against the bottom of the piston? What is the pin's purpose?
>> >>
>>
>>Scott, the pin is just for testing the setting, you push up on it to raise
>>the piston instead of using a screwdriver to raise it.......the fact that
>>one
>>carb doesn't have it, means you don't have a matched pair of
>>carbs.......but
>>thats nothing to worry about. Some carbs had the pins, some didn't but
>>that
>>would not have been the case one car in the production line.......so
>>someone
>>has replaced one carb for some reason.......no big deal.
>>Terry
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