Husqvarna 346xp Chainsaw Scored Piston Compression Test & Startup




What do you think about this video?

Adam Luna: I have the 346xp but after first 2 logs I cut I start getting some oil burn smoke on my chain and then the chain goes dull and lots of smoke coming from the chain bar. What could be my problem? Thanks

D eez: What do you think has happened DonyBoy73? Anyone else have any ideas? What and where does the contact occur that causes scoring on the piston; below the ring? BeaudreauBell1141 (1Year ago) suggests engine is running to lean and in turn exhaust gases get hotter and then the aluminum piston goes(I guess he means it gets scored) but he also kind of mentions that the “PISTON RING” often gets seized in its groove. "I think" this “Seized Piston Ring” scenario makes the most likely cause because if ring is seized in its groove, (likely due to carbon buildup) it stops the piston from being centered and when ring wears away on part of its area the piston will rub on the cylinder wall along with metal shavings and carbon. I think this is the likely cause because I recently took apart a Poulan where all the evidence pointed to the Seized Piston Ring in its piston groove.

Shaun Victor: I just purchased a used Stihl 026 and its running right at 140PSI and it has no scoring whatsoever and it runs great.140 is not really a low reading.When you pushed the piston around inside the cylinder that was weird.That top end is not going to live long,thats for sure. You should pull it down and see if the cylinder is worth salvaging and maybe get away with a new piston and ring. Would like to know how it all works out. Interesting video,thx.

donyboy73: @xxtruckin93xx thanks dude, do u have a vid of ur 12 hp briggs problem?

petr korolesov: техника всех времен

donyboy73: SOUNDS LIKE THAT IS YOUR PROBLEM

cyrus romer: I have a 345 chainsaw and it won't start and there is scoring on the intake side but I noticed that its missing a bolt underneath it could that be the problem why it won't start

daand12: @donyboy73 hmm yes there was space between the Cylinder and piston. The same as on this saw

donyboy73: @Liamautomechanic i just did the 55 with a chinese top end

MrRmh3481: Another great vid DB. Husky/elux had some labor problems when they wanted to build the small saws to sell in N America via Poulan in Ohio. That one looks just plain worn out. 346xp OEM top end is $280 or aftermarket is $120 out of uk.

Liamautomechanic: them huskys are bullit proof, grand saw, very favoured in ireland, by foresty workers, party,

Xxpoison99xX: I put an expansion chamber on my saw off an 83 rm80 and it runs waaaaaay faster

donyboy73: very possible

donyboy73: @daand12 that's what hapenned to ur scooter?

cyrus romer: I have a super xl homelite chainsaw and the piston has scoring on the bottom side of the piston and the piston is loose in the case is that bad but it runs fine

mooch1441: Ok I just thought if I did sell it I would notify the buyer way before hand. I have two other older lawnboys and have also thought about using it for parts. What would you suggest?

donyboy73: @MrRmh3481 would be worth the aftermarket kit

TheDurnans: I use 87 octane non ethanol petrol and I mix it a little rich. I use a 2.5 gallon mix jug and mix it to 2 gallons of gas. I've seen saws fry before while using the "correct" 50:1 mix, so I'm a little hesitant to run a true 50:1. To be honest, i really don't know how to properly adjust the carbs on one of these saws. I'd be afraid to lean it out to much and burn it up that way.

Carl Bowen: was he trying to make crisps haha

niper99: @Smallgasengine1 ahh what!!!

spelunkerd: Please forgive me for an unrelated question. If you need to sit your (two stroke) chainsaw for more than a few months, is it appropriate to use gas stabilizer mixed with the gas/oil mixture? How long can you leave the mixture of gas and oil in a tank before you are better off sending it to recycling?

dalvord: I'm bugging you again to wear hearing protection, especially when running chain saws.

carrick64231: Saw looks brand new-wonder how the piston got scored?

G&R Landscaping: How much psi should a tecumseh lawnmower have?

Liamautomechanic: what about a chinees top kit, ie, barell and piston, ring, kit,????????? check compression, hot and cold,???????????see what the out come,is,

TheDurnans: I just bought a 346XP ETech - not my choice to have the cat muffler, but was told all new 346s are cat muffled now. Mine runs hotter than a pistol and I haven't adjusted any of the screws on it since I bought it a little over a month ago. When it's good and hot, it doesn't like to stay running and is very hard to start. You can see the heat come off this saw after cutting oak when it's 70+ outside. I'm afraid I'm going to fry my saw! I'm running the XP oil as well.

stlouissux9119: Shocked me too!

Liamautomechanic: @donyboy73 how did it turn out,??????????????

donyboy73: @Liamautomechanic very good, i will post the video soon

donyboy73: @carrick64231 probably the owners fault

donyboy73: should be

tribulation138: I also came across saws even though they have pretty good pistons and jugs. There compression was lower than 150 but ran well. Some saws have different size base gaskets effecting compression.

Smallgasengine1: cylinder head must be loose

Bubaaak: Why is important to hold throttle open during the test ?

donyboy73: @dalvord i will get a pair of ear muffs, LOL

classicoutboards: I'd just run it till it blows

donyboy73: not quite all the power it should have

Liamautomechanic: the donkey is well, worn out, surprising, it kicks out 140 psi, could be the oil in the mix, giving a false reading, the oil mix, would seal the scores, when cold, it would be a bitch, to start when hot, u should try a compression reading when hot,??????????just a thought, good vid dony,

Patriot36: That was an excellent short class! I'm completely amazed at how well that saw runs after seeing the piston knock back and forth! LOL...credit to husky for a tough product. Seems that someone may have run it too hot.

cyrus romer: I have a 345 that won't start it has spark and good compression but there is scoring on the intake Side but none on the exhaust side I noticed a bolt missing on the underneath the motor could that be the problem not enough back pressure

mooch1441: Donyboy I have a older 2 cycle lawnboy and the piston is very scored. It has about 90 PSI but still runs ok. I was thinking about selling it before i saw the scoring. Do you think I should still sell it?

highcountrytimber: With what is going on interally 140 Psi is suprise for sure. I have a couple old saws that feel soft to the pull and are wore and still run on 120PSI. PSI is not a real good indicator if the engine is bad. Score looks like it was a manufactures defectice wrist pin,these husky are know to have some of the wrist pins being bad.

daand12: That saw just needs a new Cylinder. That will not last long with that piston and cylinder.

donyboy73: i know but i just don't have time to keep up

Ron Swanson: would something like 140psi be alright for a ms660?

bradsengine - Retired Channel!: Did the saw have its normal power??

donyboy73: @Bubaaak apparently to let more air in

donyboy73: I prefer not selling things with know defects

xxtruckin93xx: you cut those so thin you could make drink holder lol

rob066101: I would have replace the piston at this point. The chrome is probaly all in tact. I see that this is an old edition 346 so I would update it to the metal clamp and partition. The old editions had the plastic clamp and were prone to air leaks.

Rating:
Husqvarna 346xp Chainsaw Scored Piston Compression Test & Startup 4.9 out of 5

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