Compression Question

[HOODWORKZ]

I have an 01 Banshee thats been running pretty good since I bought it in feb..and I got the head

shaved today about .030 and then picked up a compression tester from harbor freight and I only got about

115 psi out of each cylinder with the bike cold and at full throttle..dont think its a leak issue because its the tester that holds the highest reading ..can anyone tell me wats up and if youve used this tester from harbor freight

[TwistedSheeRida]

how many hours are on the top end?

[DallasGDub]

Do you know what the compression was before?

[bada450r]

I have an 01 Banshee thats been running pretty good since I bought it in feb..and I got the head

shaved today about .030 and then picked up a compression tester from harbor freight and I only got about

115 psi out of each cylinder with the bike cold and at full throttle..dont think its a leak issue because its the tester that holds the highest reading ..can anyone tell me wats up and if youve used this tester from harbor freight

my harbor freight comp tester was a pos...it was offf by like 20 pounds........get a nicer tester or ask a friend to let you barrow one.

[HOODWORKZ]

how many hours are on the top end?

Ive probably put about 10 since I bought it in feb...and I bought it off an older woman the

og owner and it was her bike with pink stickers and everything she said she hardly rode it

so im assuming not a whole lot but its probably the original top end since 01

[HOODWORKZ]

Do you know what the compression was before?

nope I wish I did because the machinist told me he could only take about .028 off because of his

machine and he may have not even taken that much off my head

[Bansh-eman]

I got a Craftsman compression tester. It's pretty dang accurate. My only complaint is they didnt put a "head" on the end of it to tighten it down. For some reason it is just round, and you have to use plyers to get it tight.

[ms4x4outlaws]

dont feel bad I bought a tester off of ebay for like 20 bucks and it looks like you made off better off than i did!! My tester said I had 60psi !!!!!! i know it is alot more than that because my banshee runs really good.

[GrMeyer]

If you have a compressor you can 2nd check the gauge. But its the hose that is what is throwing your compression off. It still has to travel all the way up to the gauge before it will read the compression.

[ms4x4outlaws]

If you have a compressor you can 2nd check the gauge. But its the hose that is what is throwing your compression off. It still has to travel all the way up to the gauge before it will read the compression.

 

 

i wish!

[canyncarvr]

and I only got about

115 psi out of each cylinder with the bike cold and at full throttle..

 

 

Notwithstanding the questionable tool..where did the idea come from to do a compression test on a cold engine?

[shawn941]

Notwithstanding the questionable tool..where did the idea come from to do a compression test on a cold engine?

good point.....

[Bill]

I bought one of those testers and it did not come with the correct end,it will thread into the head but its about 2 to 3 threads short.

 

Harbor freight does sell the correct one,just bring a NGK plug with you to compare.

[HOODWORKZ]

Notwithstanding the questionable tool..where did the idea come from to do a compression test on a cold engine?

the difference between cold and hot isnt that much..and when you have an engine that wont run

you have no choice but to do a cold compression test..so I did it cold to have something

to go off of in the future if somethin happens

[GrMeyer]

the difference between cold and hot isnt that much..and when you have an engine that wont run

you have no choice but to do a cold compression test..so I did it cold to have something

to go off of in the future if somethin happens

 

Also people need to remember that some of the pistons that they expand when they warm up. So thats why I say do it on a warmed up motor.