Topic: compression tester

[apormarkos]

hi all,
i need to get one.  what size adapter or fitting or whatever do i need for use on a '76 550?
thanks,
apor

[Lumbee]

...I want to say 14mm, but don't quote me on that!  Your best bet is to bring a plug with you to the auto parts store and compare the fitting to the plug to be sure its the same size...

[TwoTired]

The Cb550 amd 750 use 12mm spark plug threaded holes.

It's in the spark plug FAQ.
The D in D7EA number indicates 12 mm threads.

[apormarkos]

thanks twotired, i was having no luck finding the info... my forum search skills are lacking.
i was browsing sears to see if they have a unit that fits out of the box, but they list only 14 and 18mm sizes.  are there adaptors to be had easily, or is a 12mm sparkplug hole a thing of the past or too rare for auto parts stores to stock them?
apor

[Lumbee]

...if you have an Orielly Auto parts in your area, thats where I got mine from, and it comes with a 12mm adapter...

[Tim2005]

Has anyone found anywhere in the UK that sells a 12mm adapter? Or an online supplier?

Cheers

[TwoTired]

Knowledgeable auto parts stores can get them if not stock them.  The high volume parts movers won't care much for motorcycle bits.
I can't remember where I got my tester many years ago and there is no brand name on it!!

I put "12mm compression tester" into the google search engine and found these:

http://www.midwayautosupply.com/detailedproductdescription.asp?3074
http://www.shop.com/op/aprod-p24056608-k24-g4-~12mm+compression+tester-nover?sourceid=3
http://www.amazon.com/gp/product/B000A8N0NQ/102-9248708-0383358?v=glance&n=15684181
http://www.actron.com/product_detail.php?pid=16170

Probably can find more...

[Lumbee]

...that first one is the same one I got from Oreilly...its was around $20...

[Tim.]

Might want to consider a leak-down tester instead if you have an air compressor.  I've never used one myself, but will be soon 

[apormarkos]

Might want to consider a leak-down tester instead if you have an air compressor.  I've never used one myself, but will be soon 

i don't have a compressor, but what is leak down testing?
apor

[DammitDan]

http://www.geocities.com/dsmgrrrl/FAQs/leakdown.htm

 

Course that's for car engines, but it's basically the same.

[apormarkos]

very informative.... never heard of that test.  though i did find a compression tester at sears that had everything from 10mm-18mm adapters and compression seems to be good, ranging from 145-155.  i did get a scare when #2 was reading 100, but then i realized i had the throttle closed   
apor