Husqvarna 357xp advice

[Steve_Ranger]

Afaik the saw doesn't have a decomp as they hole has been plugged with a bolt. I got a reading of 105psi from 6 pulls as this was when the needle stopped going up. I'm not 100% how good the gauge is as yet again it was a cheap jobbie from eBay. So the "scores" on the cylinder are not into the cylinder, but just metal that has been deposited on the surface of the cylinder? If that's the case I'll get some muratic acid and give it a go.

[spudulike]

Normal compression for one of these saws is 150 - 170psi, mine pulls 200psi but is lightly tuned:blushing:

 

Wear gloves and eye protection when messing with acid:thumbup:

[Steve_Ranger]

I think the psi reading might be wrong. It was on the 6th pull that I checked, but from watching the needle this time, it rises to 120psi on around the 4th pull then drops to 105psi so I reckon the gauge is faulty as this was the same case when I tried my 1 year old Stihl saw that has had little use.

 

I'll have a go at cleaning the bore. Am I right in saying you usually use muratic acid?

[spudulike]

I think the psi reading might be wrong. It was on the 6th pull that I checked, but from watching the needle this time, it rises to 120psi on around the 4th pull then drops to 105psi so I reckon the gauge is faulty as this was the same case when I tried my 1 year old Stihl saw that has had little use.

 

I'll have a go at cleaning the bore. Am I right in saying you usually use muratic acid?

 

It sounds like your gauge is manufactured for car engines and not small bore kit. It should have a light sprung schrader valve in the end of the gauge - the Gunson one is very good!

 

It is Muriatic acid and it is the old school name for Hydrochloric acid - this works fine and a strong alkalie will have the same effect!

[wisecobandit]

Just a quickie because unlike spud to miss but you are checking compression with the throttle half open aren't you?

[Steve_Ranger]

I did have the throttle half open now yea . The Gunson compression tester arrived today and the rebuilt 357 with chinese cylinder was pulling 145psi so not brilliant, but its alright for how infrequently I use it.

 

As to the 357 on my bench, I showed the cylinder to a friend of mine who's good with engines and he reckons its a write-off as there is both scoring into the cylinder as well as deposits raising the surface.

 

Does anyone know of any decent aftermarket 357 cylinders? From some searches on google and eBay all I can find are either the stock Husqvarna ones for ~ £150 or chinese rip-offs for ~£45-55.

[wisecobandit]

TBH ive got a new Chinese one here sat and its got the removeable transfer covers etc so would actually be very easy and effortless for a porting job. Its also a 359 so an entire 2cc's bigger lol.

Like you say tho they do only tend to pull about 140psi and that's without a gasket most of the time. I keep meaning to have a look to see if theres a way of losing room in the chamber by utilizing the decomp rather than skimming the bottom of the pot or modding the piston which would both cost me money.

[wisecobandit]

I assume it is actually deep scoring which cant be lightly sanded out and high up in the cylinder on your oe pot above the ports?

[Eddy_t]

I did have the throttle half open now yea . The Gunson compression tester arrived today and the rebuilt 357 with chinese cylinder was pulling 145psi so not brilliant, but its alright for how infrequently I use it.

 

As to the 357 on my bench, I showed the cylinder to a friend of mine who's good with engines and he reckons its a write-off as there is both scoring into the cylinder as well as deposits raising the surface.

 

Does anyone know of any decent aftermarket 357 cylinders? From some searches on google and eBay all I can find are either the stock Husqvarna ones for ~ £150 or chinese rip-offs for ~£45-55.

 

Tesgol is a seller on eBay who does C&P kits for a 357xp, they're somewhere between £50-80, buy the meteor one as opposed to the golf

 

 

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[Steve_Ranger]

Right, finally got some free time to get back to work on this saw. Going to replace the piston and cylinder with.

 

HUSQVARNA 357 46MM CYLINDER KIT NISIC COATED 1YR WARRANTY FOR PROFFESIONAL USERS | eBay

 

Seems to be the best quality I can find bar buying a stock Husqvarna one. The original burnt up on the exhaust port side. If the plastic clamp on the intake manifold had worn out, would this cause this to happen? I was reading about a metal clamp alternate for the intake manifold that was released by Husqvarna. Is it worth fitting one of these anyway? The only problem is that I can only find them for sale in the US.