Finally did a compression test on my bike

thirdgenlxi · 05-07-2009, 11:12 PM

And I must say... not too bad! I think they actually would be better though if I had the correct fitting for the compression tester. The coupling I have is the right diameter and thread pitch for my cyl head, but it's about half the length of the threads on the plugs, so it's not long enough to thread in with the proper o-ring. I had to end up using a dinky little a/c o-ring which was thinner and did affect my readings some because it only threaded on maybe one turn (it was leaking a lil bit at one point). Had I used the correct fitting (which I can't seem to find anywhere) I have a feeling they would have been damn near spot on

Readings were....

cyl 1 - 175 psi
cyl 2 - 165 psi
cyl 3 - 170 psi
cyl 4 - 165 psi

The spec in the manual is 178 psi, so even with the coupling that didn't fit quite right, they were all still pretty close!

Plugs still looked pretty good too (had 38k miles on these plugs).... that's a very good thing, means she's running the way she should be (although I know it might be a lil rich cuz I need to have my PCIII tuned)

Oh yea air filter was looking pretty dirty too so I cleaned it out and re-oiled.... gotta get her all ready for this months round of roadtrips! LOL

tached1000rr · 05-07-2009, 11:20 PM

What type of airfilter you running? I was thinking of getting a K & N for the F4I.

Gas Man · 05-07-2009, 11:23 PM

That is killer Jared!! Good numbers.

Plugs look nice and good cinnamon color!

thirdgenlxi · 05-07-2009, 11:30 PM

Quote:

Originally Posted by tached1000rr

What type of airfilter you running? I was thinking of getting a K & N for the F4I.

I've been running a BMC race for awhile now... very happy with it, it catches alot of crap. Everytime I take it out it's dirty again so I know it's doing it's job

Rangerscott · 05-08-2009, 12:11 AM

May you be blessed with another 100,000 miles. LOL

Rider · 05-08-2009, 08:47 AM

You're not running rich at all. The color of the plugs indicate you are exactly where you need to be with you air fuel ratio.

BobTheBiker · 05-08-2009, 11:00 AM

looks like its tuned pretty good to me. for a bike with 150+k miles on it only being a few pounds short of the spec on compression is EXCELLENT. that impresses me.

ZUKIMON · 05-13-2009, 01:05 AM

Those numbers are impressive man. Plugs loose awesome too.

Here's a little something I learned from a guy at the dealership I work for. When he put the fuel pressure regulator on my bike (this is before I owned it) he also wanted to check compression. Due to the very small plugs that we have, he had no way to connect his standard guage to it. He took an old plug that he had from changing these and broke the ceramic out of it and removed everything but the threaded end/base and the hex head. He then threaded the upper portion of that to match his hoses for his guage and there you have it, instant adapter. I plan on doing the same thing the next time I change out the plugs as I want to be able to keep a check on it each time I do plugs.

05-07-2009, 11:12 PM	#1
thirdgenlxi They call me a ride whore Join Date: Dec 2008 Location: Mills River, NC Moto: 2004 CBR 600 F4i Posts: 353	Finally did a compression test on my bike And I must say... not too bad! I think they actually would be better though if I had the correct fitting for the compression tester. The coupling I have is the right diameter and thread pitch for my cyl head, but it's about half the length of the threads on the plugs, so it's not long enough to thread in with the proper o-ring. I had to end up using a dinky little a/c o-ring which was thinner and did affect my readings some because it only threaded on maybe one turn (it was leaking a lil bit at one point). Had I used the correct fitting (which I can't seem to find anywhere) I have a feeling they would have been damn near spot on Readings were.... cyl 1 - 175 psi cyl 2 - 165 psi cyl 3 - 170 psi cyl 4 - 165 psi The spec in the manual is 178 psi, so even with the coupling that didn't fit quite right, they were all still pretty close! Plugs still looked pretty good too (had 38k miles on these plugs).... that's a very good thing, means she's running the way she should be (although I know it might be a lil rich cuz I need to have my PCIII tuned) Oh yea air filter was looking pretty dirty too so I cleaned it out and re-oiled.... gotta get her all ready for this months round of roadtrips! LOL __________________ *-Jared* Black/Red '04 CBR 600 F4i - 253,500 miles and counting Black '89 Accord LX-i sedan - 435,200 miles still going strong States visited on my F4i facebook.com/thirdgenlxi Last edited by thirdgenlxi; 05-07-2009 at 11:14 PM..

05-07-2009, 11:23 PM	#3
Gas Man Trip's Assistant Join Date: Feb 2008 Location: Imported from Detroit Moto: 2009 HD Street Classic Posts: 12,149	That is killer Jared!! Good numbers. Plugs look nice and good cinnamon color! __________________ -Chris "Why pay somebody else to fuck up your bike?" Run Amsoil Product

05-13-2009, 01:05 AM	#8
ZUKIMON Is this thing on? Join Date: Feb 2009 Location: Ashe Co, NC (Near Boone) Moto: '01, 929RR Posts: 398	Those numbers are impressive man. Plugs loose awesome too. Here's a little something I learned from a guy at the dealership I work for. When he put the fuel pressure regulator on my bike (this is before I owned it) he also wanted to check compression. Due to the very small plugs that we have, he had no way to connect his standard guage to it. He took an old plug that he had from changing these and broke the ceramic out of it and removed everything but the threaded end/base and the hex head. He then threaded the upper portion of that to match his hoses for his guage and there you have it, instant adapter. I plan on doing the same thing the next time I change out the plugs as I want to be able to keep a check on it each time I do plugs. __________________ Dirty Harry said there's nothing wrong with a little shooting, as long as the right people get shot.

05-07-2009, 11:20 PM	#2
tached1000rr WERA White Plate Join Date: Dec 2008 Location: NC Moto: 2009 GSXR 1300 Posts: 2,448	What type of airfilter you running? I was thinking of getting a K & N for the F4I.

05-08-2009, 12:11 AM	#5
Rangerscott Viff6N Mutated Warrior Join Date: Mar 2009 Location: Texas Moto: '01 Honda VFR 800 & '09 ER-6N Posts: 8,704	May you be blessed with another 100,000 miles. LOL

05-08-2009, 08:47 AM	#6
Rider Moto GP Star Join Date: Feb 2008 Posts: 12,156	You're not running rich at all. The color of the plugs indicate you are exactly where you need to be with you air fuel ratio.

05-08-2009, 11:00 AM	#7
BobTheBiker too much time on my hands Join Date: Jul 2008 Location: the northern district of god damn Moto: 01 ZX6R, looking for more now. Posts: 1,802	looks like its tuned pretty good to me. for a bike with 150+k miles on it only being a few pounds short of the spec on compression is EXCELLENT. that impresses me.