MS 180 Issues after Complete rebuild

[blsnelling]

The low compression reading is your gauge. It MUST have a valve at the very tip. Without it, the entire hose is adding volume to the combustion chamber.

IMHO, you have a carb/impulse/fuel issue.

 

[Aggie 2012]

Thanks Brad. My intake boot is aftermarket from China. I'm wondering if maybe the internal impulse passage could be clogged or maybe just not to spec?



Sent from my iPhone using Tapatalk

 

[Aggie 2012]

Also,
Here is the compression gauge set I have. Should I try to modify it with fittings to get the schrader valve towards the bottom or just sell it on the bay and find something else?

Thanks


Sent from my iPhone using Tapatalk

 

[Aggie 2012]

Sent from my iPhone using Tapatalk

 

[blsnelling]

Sent from my iPhone using Tapatalk

I have a similar SnapOn kit. I believe you actually DO have the required Schrader valve. Take another look when you have a chance. If your compression is only 120, then addressing that is certainly your primary concern.

 

[Aggie 2012]

Your the man Brad. I appreciate you taking time out for me.

I'll re assess the situation and let y'all know what I find


Sent from my iPhone using Tapatalk

 

[HarleyT]

Here is the boot out of one that I worked on a while back. The guy that worked on it before wasn't paying attention when he put it back together. The saw had been ran a long time like that. How I'll never know.

 

[Aggie 2012]

Looks like the cylinder side of the impulse line is somewhat folded over?

Thanks Harley. I need to check this


Sent from my iPhone using Tapatalk

 

[HarleyT]

Yes the saw ran, but real squirrely. I was about to do a leakdown test, and I noticed a slight pucker/gap, I guess that was where the carb was getting it's impulse from, that little gap.

 

[Khntr85]

Make sure the hole on the intake boot is lined up with the hole on the jug....

Did you put the plastic ring back in the boot, is the boot sealing correctly...

Sounds like could be carb, make sure the diaphragms aware in correct order...

 

[Aggie 2012]

Alright I think I have figured out the issue.
This aftermarket intake boot does not seal at the cylinder very well causing an air leak. I have dismantled it three times with the same result so I went ahead and did some customization.

Is this going to work?
It certainly doesn't leak air anymore and I don't have to worry about it coming loose.

Sent from my iPhone using Tapatalk

 

[HarleyT]

If you are having trouble there, what about where it meets the carb?
How much did you pay for the chitty boot?

 

[Aggie 2012]

Haha! I paid $5 and got 2 boots along with 2 of those plastic clips.
I suppose sometimes I am my own worst enemy


Sent from my iPhone using Tapatalk

 

[HarleyT]

The hose clamp would likely work better without the white ring, but I would be unsure of the area of where it meets the carb.
What about the little plastic expander, are you using it?

 

[Aggie 2012]

Yes sir I tried that ring by itself and made sure that it was pushed all the way onto the cylinder but when I pressure test it she blows bubble from the top portion of that boot.


Sent from my iPhone using Tapatalk

 

[Aggie 2012]

I wish I could use something like that metal retainer on the husky 350


Sent from my iPhone using Tapatalk

 

[a. palmer jr.]

It's possible the new P/C didn't break in too well causing the low compression. Like was said earlier it's also possible the cylinder/ piston/ rings might be mis-matched..

 

[Aggie 2012]

Will a hyway piston and rings work in an NWP aftermarket cylinder?

I just tried this mix match this afternoon on the ms180. No air leaks and I replaced the fuel line, filter, and Intake boot with oem.

Before I cranked it up compression was reading only 120 psi which is disappointing. It also has the same bog if you hammer down on the throttle.

I let a couple tanks of fuel idle through it this afternoon and it seems to be running a little bit better but still no where near the pickup I was hoping for.

Do y'all think it will gain compression over time?

Also need to check squish but not sure what I'd be able to do differently even if the squish was insufficient (no base gasket here to delete)


Sent from my iPhone using Tapatalk

 

[BrokenSVT]

You aren't doing it any favors letting "tanks of fuel idle through". A proper break-in is beyond important.

 

[Aggie 2012]

You aren't doing it any favors letting "tanks of fuel idle through". A proper break-in is beyond important.

Well what would a proper break in consist of? I've read a lot of mixed reviews on this


Sent from my iPhone using Tapatalk