064 & ms660 compression test?

shop deals on amazon
Rugged made
Advertise with us
Arborist Forum

Help Support Arborist Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
MG porting

MG porting

ArboristSite Guru
Joined
Nov 25, 2017
Messages
676
Reaction score
377
Location
King County
OK I have two saws a stihl 064 av ported and decked and a ms660 wich has a meteor jug and slug ported not decked but I did a compression test on both of them and only got 100psi out of them? Yea right I say because you can barely pull them over and they both run stupid strong and start with two or three pulls cold so I'm sure I'm in the right direction and thinking that my compression gage is no good or I just can't spin them over fast enough to get the right reading. What are your guys thoughts on this?? And thanks to you all.
 
jeremyc said:
Have you used that gauge to check compression on saws before? If it doesn't have a Schrader valve at the end of the adapter where it threads into the spark plug hole, it will not give you correct readings.
Click to expand...
Yes I've used it before on a 044 but that was five years ago and it does have the Schrader valve but it's been used a lot by a few of my friends who have drag cars so which does make me lean twords that it's time to replace it? Not sure though?
 
blsnelling said:
They have way more than 100 PSI if they run strong.
Click to expand...
Yep and I'm going to have to go and just bight the bullet and get a new gage or try to chase down a Mac tool van down and see if they will swop it out not sure the one I have is getting up there for age. Lol
 
Be sure the spare cores are usually white and very light spring pressure. The tire ones are usually red and much higher spring pressure. You could use a proper white one and get say 180psi then use one from a tire and get 80-100 psi.
 
smokey7 said:
Be sure the spare cores are usually white and very light spring pressure. The tire ones are usually red and much higher spring pressure. You could use a proper white one and get say 180psi then use one from a tire and get 80-100 psi.
Click to expand...
That's interesting because the one's that I have in the kit are red.
 
blsnelling said:
I bet your valve is stock open. That essentially adds the volume of the hose to the combustion chamber.
Click to expand...
That makes sense I'm going to have to wait until Tuesday to get the right valves for it there cheep I did a test on my weedeater also and got the same results so I'm hoping it's just the valves and not the gage but it's a Mac so they should stand behind it and exchange it I hope.
 
Well no such luck on the new valves there going to see if they can order some I'm not going to hold my breath on that so here I'm going to wait until Friday then buy a new tester. I'll keep you all posted as soon as something comes up.
 
After reading this thread, I got a bit worried and compression tested my 064 and one of my MS 660 saws that I rebuilt. I measured 160 psi. from the 064 and 155 psi. from the MS 660. Now I need some horse linament rubbed on my right shoulder by LOML after she gets through watching the Yankees pound out a few homers.
 
Wood Doctor said:
After reading this thread, I got a bit worried and compression tested my 064 and one of my MS 660 saws that I rebuilt. I measured 160 psi. from the 064 and 155 psi. from the MS 660. Now I need some horse linament rubbed on my right shoulder by LOML after she gets through watching the Yankees pound out a few homers.
Click to expand...
I'm not worried about the saws to much because the fact they run strong and will give you realign every time you try pulling them over I just want to know what the numbers are just because I new a year ago my 064 was tipping right at 195psi my ms660 feels like it's right up there to but having a problem with my compression gage is not fun I'll get it handled Friday and give you all my results. Got to love tools. Lol.
 
Well today I got my new compression gage set today to only find out that it didn't come with the wight valve in it $46 buck to find that out. Lol. Now I'm going to have to see when the Mac or SnapOn truck is is going to be in town so I can get the right valve this is kinda driving me crazy now. Lol
 
MG porting said:
Well today I got my new compression gage set today to only find out that it didn't come with the wight valve in it $46 buck to find that out. Lol. Now I'm going to have to see when the Mac or SnapOn truck is is going to be in town so I can get the right valve this is kinda driving me crazy now. Lol
Click to expand...
Hold the saw by the pull-cord handle with the bar and chain removed. Let it fall under its own weight. If it drops straight to the floor like a dead goose, it has no compression and needs a new top end rebuild. If it fails to fall and hangs on, the engine will probably start and run, assuming the carb, fuel lines, and spark are OK. But, that's a big assumption. Good luck.
 
Wood Doctor said:
Hold the saw by the pull-cord handle with the bar and chain removed. Let it fall under its own weight. If it drops straight to the floor like a dead goose, it has no compression and needs a new top end rebuild. If it fails to fall and hangs on, the engine will probably start and run, assuming the carb, fuel lines, and spark are OK. But, that's a big assumption. Good luck.
Click to expand...
Lol they have plenty of compression I just would like to get an number that's all my compression tester I thought had the right valve but lending it to my friends all of the sudden it has the wrong one so I'll be getting the right one soon.
 

Similar threads

B
Chainsaw compression
2
Replies
24
Views
1K
WI_Hedgehog
WI_Hedgehog
T
T540 XP I & II Compression Issues
Replies
8
Views
2K
Tobystihl
Tobystihl
D
Want to Buy 064 Flywheel/Coil
Replies
3
Views
517
dudz3636
D
2
Stihl MS 361 Vacuum and Pressure testing - need some help!
Replies
10
Views
2K
stihltech
stihltech
Dan hensley
MS 084 AV
2
Replies
22
Views
755
pioneerguy600
pioneerguy600

Latest posts

Back
Top