K760

[Adal]

Hello Joepro once again I ask you for help please I have been talking the husqvarna k760 to bits I have had a look in the cylinder head and there is no deep marks in the cylinder the piston rings are not broken they is a few marks on the cylinder I have measured the intake ports and there are twenty seven mm can you tell me please what do you think I should get for it

 

[JOEPRO]

Hello Joepro once again I ask you for help please I have been talking the husqvarna k760 to bits I have had a look in the cylinder head and there is no deep marks in the cylinder the piston rings are not broken they is a few marks on the cylinder I have measured the intake ports and there are twenty seven mm can you tell me please what do you think I should get for it

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Whilst I can see they are minimal enough there are still several scores in that cylinder wall and piston.

At the very least it needs a new piston kit. But for not much more you could put a full cylinder kit in which is what I would do in the case above.

The trouble is finding a supplier that can send you a early type 27mm cylinder kit..... as said before some suppliers don't even know the difference and send only the wider newer type..

From your profile you are from the UK yes? So there should be several options of where to buy if you can be sure of the correct size being supplied.

 

[JOEPRO]

This is a good suppler and this listing of theirs is clear enough that this is an early type cylinder. Double check yours is 15mm edge to edge before ordering though to be really sure

Husqvarna K750, K760 Cylinder & Piston 51mm Bore (Pre 2013)

Replacement parts suitable for the following makes & models;HusqvarnaK750, K760PartnerK750Barrel & piston supplied with: 51mm nikasil lined cylinder, piston, gudgeon pin & clipsNote! Only suitable for K760 models built before 2013, if built after, see 6844 or 6598 Also! The distance between top...

www.gardenhirespares.co.uk

 

[JOEPRO]

If you do decide to go just the new piston route which MAY work let me know as I have a new aftermarket K760 piston kit sitting here which I did not use and happy to post it out.

 

[dan.taylor.1]

If you can't get sorted. Husqvarnas head office is at newton aycliffe just down the m1 from you.

 

[Adal]

Hello Joepro I live in Tyne and Wear I think I will have a go at the piston kit first then if not then the twenty seven mm cylinder head Also I do not know if you get a new gasket as it was in bits when I took it apart. will I have to get it separate. you say you would post me out a kit if you tell me please how much I will send you the cost if you wish

 

[Adal]

Hello Joepro PayPal will be fine my daughter has it and she will send you the price for the piston kit
She says you will send a link for it to be sent to as I do not know

 

[Adal]

Attempting to put back k760 together had to give up due to sciatica it’s a pain from
Hell I had it for over three weeks so will have a go when things get better

 

[Adal]

Hello all.
I put the husqvarna k760 back together today and tried to prime it. It would not prime so took the carb unit off and put the inlet tube that comes from the tank then to the carb onto the primer bulb then primed it. it primed the bulb was full of petrol so put the carb back on then tried to prime it it primed but had petrol run out were the handle is. (Photo)i tried to start it but it will not start I have put petrol in the spark plug hole and it starts runs for a bit then stops. can any one tell me please why it is leaking

 

[not done it yet]

Either because the pipes are leaking or not connected?

 

[Adal]

Hello Joepro
Should have taken the advice from Joepro and put a full cylinder kit in. Instead of just the piston and rings
I put a pressure test on today and as you can see in the Photos it has not made a lot of a difference if at all.I just do not know what to do next as I do not know if you can buy just the cylinder head or do you have to get the full kit

 

[JOEPRO]

Yes looks like you need a cylinder kit to make it good, the original cylinder has bad wear or scores if the new piston and rings didn't work

When looking for a new cylinder kit just make sure its correct for your engine as stated before you need to measure the intake ports before ordering.

 

[dan.taylor.1]

Hello Joepro
Should have taken the advice from Joepro and put a full cylinder kit in. Instead of just the piston and rings
I put a pressure test on today and as you can see in the Photos it has not made a lot of a difference if at all.I just do not know what to do next as I do not know if you can buy just the cylinder head or do you have to get the full kit

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Did you hone the bore?

 

[Adal]

Hello Joepro I measured the ports there are twenty seven mm so it puts it at pre 2013
Thanks once again for all of your help. I will re post to say if have won or lost

 

[Adal]

Update on husqvarna k760 put new piston and rings new cylinder head put compression test on now I have less pressure than I had before. It starts if you put petrol in the pot I just do not know what to do. Bin it or not

 

[dan.taylor.1]

Update on husqvarna k760 put new piston and rings new cylinder head put compression test on now I have less pressure than I had before. It starts if you put petrol in the pot I just do not know what to do. Bin it or not

Are these parts oem, or aftermarket? Is the decomp plugged, if its still there is it leaking or open?

 

[Adal]

Hello all
Has I have found out that one of the screws that holds the cylinder head on will not tighten up properly I think that the thread is not good.explaining that I am not getting a good compression. Has any one had the same problem. I think the only thing I can do is re drill and re tap the hole starting with a tapper then a plug tap. If any one can help I will be very pleased
Alan

 

[JOEPRO]

Hello all
Has I have found out that one of the screws that holds the cylinder head on will not tighten up properly I think that the thread is not good.explaining that I am not getting a good compression. Has any one had the same problem. I think the only thing I can do is re drill and re tap the hole starting with a tapper then a plug tap. If any one can help I will be very pleased
Alan

These are m5 threads I believe. I have used V coil brand helicoil repair kits on several saws with perfect results. That's your best bet. When at it I would coil all 4x bolts then refit cylinder.

Are you sure the intake ports are OK? Because even with a loose bolt you should be getting good compression with a new cylinder kit. Or maybe your compression tester is faulty. Have you any other good working 2 stroke equipment to test the compression on to compare readings?

 

[Adal]

Hello Joepro once again for you help

Yes I will have a look at ports.I was giving a v heilcoil repair kit. as you can see by the Photos. I will try the compression tester to see if it working properly on a lawnmower will this make a difference the cylinder head gasket has some oil on it must the gasket be completely dry to work correctly. thank you for you help

 

[Adal]

Up date on husqvarna have getting it running. But still can not find out how the petrol is still leaking from the carburettor. I put a length of fuel pipe from the carb to the primer so I could prime it and look under to see if I could see were the fuel was coming from the petrol drips from the carb but I can not see were from. the fuel pipes intake and outtake are good The screws on the bottom of the carb are ok. The diaphragm etc in the carb were all new and replaced. As for the cylinder head I put heilcoil 5m in all four screw holes and it worked fine