Thread: compression tester length
05-08-2008, 09:54 AM #1
compression tester length
i've searched and i can't seem to find the answer, although its probably simple. i bought an actron compression tester kit from a local parts store and the 14mm long reach attachment isn't as long as my br8es-11 on my 04 xlt 1200. does this matter? i don't want to open the kit if it won't work so i can return it. thanks.
05-08-2008, 10:21 AM #2
Nah, I wouldn't worry about it.
05-08-2008, 11:55 AM #3
You will get a lower reading if the attachment is shorter than the spark plug length. I have tried all the attachments in my kit, and the longer one gave me a higher compression reading.
05-08-2008, 03:38 PM #4
How much are we talking about Brandon? Enough to justify going out and buying a new attachment? If you're talking a couple of PSI, well....
Last edited by fullboogie; 05-08-2008 at 03:42 PM.
05-08-2008, 05:51 PM #5
- Join Date
- Aug 2006
clipped from SBT for the old shool yam's but just the same
With a good compression gauge you must make sure you have the correct adaptor. There are ½ inch and ¾ inch spark plug reaches and you have to have the correct one or your compression reading will be incorrect. Yamaha uses the ½ inch reach, veryone else uses ¾ inch.
05-08-2008, 07:58 PM #6
My short attachment yields 5psi more comp than the longer one i have every time......
05-08-2008, 09:21 PM #7
05-10-2008, 02:12 AM #8
basically i tried to find a mirror image of my br8es plug that is used on my xp and my xlt. the sears kit had a 14mm x 18mm that looked like a perfect fit. $60 was a little spendy but at least now i can check my compression. i got 110 psi across the board with the throttle closed (forgot to open it).
05-10-2008, 02:30 AM #9
I tried my compression kit out today with the longer fitting. The longer fitting matched the length of the spark plug. It yielded a lower compression than using the shorter. However I am not sure if there was a leak. The O ring was kinda jacked.
With the short on my 1390 it was 145-150-150.
05-10-2008, 02:39 AM #10
Did you getr out yesterday?
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