Jump to content

Log in or register to remove this advert

3120 hot start issue


TheHungrySquirrel
 Share

Recommended Posts

Absolutley so, however this is only going to help if the throttle is not opening enough on the part throttle lock, you can adjust it yourself. there is also a low speed screw ( it has a fixed main jet ) this can be richened slightly also to help.

Link to comment
Share on other sites

Log in or register to remove this advert

  • Replies 23
  • Created
  • Last Reply

Top Posters In This Topic

The piston stop - which type? one of those metal ones or the Stihl Plastic type?

It is possible that you have fractured the piston crown and it makes enough compression to start but not enough on a hot start.

 

Had a 262 like that once!

 

I think it needs a look at by a competent tech before getting too down hearted!

Link to comment
Share on other sites

The piston stop - which type? one of those metal ones or the Stihl Plastic type?

 

It is possible that you have fractured the piston crown and it makes enough compression to start but not enough on a hot start.

 

 

 

Had a 262 like that once!

 

 

 

I think it needs a look at by a competent tech before getting too down hearted!

 

 

It was the black plastic stihl one, broke one in my 150 a few days before this happened but managed to get it out.

 

On the 3120 it snapped and popped out the exhaust port and caught the front lip of the piston making a little burr. It was above the rings and had done no damage to pot, I got the pot off and removed the burr, reassembled and now it's doing this.

 

Local dealer seems to keep saying it was flooding.

Would I be able to see the fracture atop the piston or micro size??

Link to comment
Share on other sites

OK, sounds like the piston stop was through the exhaust port rather than between the crown and squish band. Next question - what were you doing and what were you using?

 

Air chuck or tommy bar - and how much force?:blushing:

 

It is possible that the top ring has become stuck in the ring groove due to the compression of the top edge of the piston, this may cause the issues you have!

 

It is unlikely the port would be damaged with what you have done. Taking the muffler off may give you an idea if the piston has any damage to the front.

Link to comment
Share on other sites

  • 2 weeks later...
OK, sounds like the piston stop was through the exhaust port rather than between the crown and squish band. Next question - what were you doing and what were you using?

 

 

 

Air chuck or tommy bar - and how much force?:blushing:

 

 

 

It is possible that the top ring has become stuck in the ring groove due to the compression of the top edge of the piston, this may cause the issues you have!

 

 

 

It is unlikely the port would be damaged with what you have done. Taking the muffler off may give you an idea if the piston has any damage to the front.

 

 

Yep it had popped into the exhaust outlet.

Was trying to change the sprocket and it was a stihl piston stop that I have had a similar problem with on another saw.

 

Just my arms and a bar spanner to undo it so nothing to aggressive.

 

No visible damage to rings or piston.

 

Update: I took it to my local dealer who had it for a week and then told me it was just flooded but handed me a £40 bill for new plug, fuel and labour. It hasn't cured the problem though and now there demanding payment.

Surely should be covered under warranty as saws less than a year old and has about 2-3 hours run time total.

Link to comment
Share on other sites

Take the saw back to the dealer and ask him to start it and you will pay the bill if it fires and runs! Either you have some sort of starting issue or they haven't fixed the issue!

 

The warranty thing - if the issue was caused by the piston stop breaking then it is your fault. If the issue has been there since day one or has some sort of manufacturing fault then it is a warranty issue, difficult to tell at the moment.

 

I would pull the spark plug out, turn the saw upside down and pull the start handle over fast 3-5 times and see how much fuel comes out of the plug hole. Light vapour is fine but if it splatters and drips out then it is flooded.

 

If it is flooded, pull it over hard a few more times, let it dry overnight with the plug out, heat the plug up with a plumbers torch or gas hob and then put it back, use the fast idle and full choke and pull it over hard 3-4 times and then knock the choke off and give yourself a work out - should fire or pop/run.

 

If it doesn't - back to the dealer or find another route to fix it.

Link to comment
Share on other sites

Cheers for that advice spud. I'll have a play with it tomorrow.

The issue is starting it once hot, used it to stump some beech trees the other day made like 4 cuts then turned it off and couldn't start it all day.

 

Sounds like it is possible that the saw is lacking compression but is difficult to measure on these big saws. I still wonder if the top ring has stuck in the groove after the piston stop episode!

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share


  •  

  • Featured Adverts

About

Arbtalk.co.uk is a hub for the arboriculture industry in the UK.  
If you're just starting out and you need business, equipment, tech or training support you're in the right place.  If you've done it, made it, got a van load of oily t-shirts and have decided to give something back by sharing your knowledge or wisdom,  then you're welcome too.
If you would like to contribute to making this industry more effective and safe then welcome.
Just like a living tree, it'll always be a work in progress.
Please have a look around, sign up, share and contribute the best you have.

See you inside.

The Arbtalk Team

Follow us

Articles

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.