12mm compression tester adaptor?

Hi folks

Can anyone in the UK help with this one, I bought a compression tester to
check my bike. With it came the usual 18 and 14mm adaptors, however the
spark plug has a 12mm thread. I have try about everywhere i can think of to
get an adaptor this size but have failed. It is becoming a real pain in the
butt!!
Ive tried bike shops, engineering shops, car accessory & spare parts

Any advice would be gratefully received


many thanks & thanks to all who in the past have offered help with other
issues.


Allan
Edinburgh

 

I've broken the ceramic insulator off a plug before and brazed an
air fitting to it to supply compressed air to an engine cylinder.
You might consider bodging up a similar thing, perhaps sacrifice
the 18mm adaptor (or whichever one you will use least often) as
one half of a homebrew 12mm plug thread->compression tester adaptor.

 

Hi Mark ,that's actually not a bad idea, will give that some thought, many
thanks for that info.
Cheers

Allan

 

I made my own from the 14mm. If you send me yours to take the place of
mine, plus a little money to pay for postage, and maybe a little to cover
the time I'll put into making the 14mm you send into another 12mm for me,
you too can have a 12mm adapter. I'm not the closest alternative, but I do
have what you're looking for.


--
Later,

Charlie



Fix the e-mail address and it will get to me

There are about 100 different sorts of insects in Mexico that some people
eat on purpose.

 

The only compression gauge I've had experience with (automotive)
didn't even use a threaded coupling -- it had a conical rubber fitting,
with a tire-type valve-stem in the center. One merely held the gauge
tightly against the spark-plug opening and used a remote start switch to
crank the engine a few cycles (the valve kept the highest achieved
pressure until one pressed the release).

--

 

Gunson do a 14mm adaptor - the same adaptor is used for their Hi-gauge
and their colortune. You can get it off their website for £3.95 or
somewhere like Halfords should either have it or be able to get it.

http://www.gunson.co.uk/acatalog/Gunson_Catalogue_Exhaust_Gas_Analysers_Mixture_Control_5.html

-Dan

 

take a spark plug and weld/braze a fitting on it.
good luck, sammmm