066 problems=?????'s

[sILlogger]

I just bought an 066 of steal bay!! needs some work, guy says that it isn't pulling fuel into the carb, but it will run if u squirt fuel into the carb. Im thinking that is is leaking air some where and not building up the vacuum needed to pull in the fuel. Am i right in thinking this??? im going to have it apart anyway because im gonna rering it, that being said the intake and base gasket will get inspected(base gasket changed) the only other thing that im thinking it could be is the crank seals. is this a logical diagnosis???? thoughts and ideas much appreciated. thanks for the help!

 

[bcorradi]

I think it would be more probable that its a fuel delivery issue such as a bad impulse hose, plugged fuel filter, bad fuel line, dirty carb, or a carb in need of rebuild. Start with the easiest ones to check first.

1) Fuel Filter
2) Fuel LIne
3) Carb

If you don't find any issues with any of the above check the impulse hose when you you rering the saw.

 

[flht01]

Unless compression is very low or p/c seized, before doing anything major I'd check the impulse hose and fuel line for leaks. If no problems found there, I'd look for problems with the carb (metering diaphram)

-----------------------------------
Sorry, I must have been typing when bcorradi posted.

 

[Lakeside53]

If it was me... I'd take it from the top down... compression, pressure and vac test... , carb, etc.. Too many unknowns in a used saw that doesn't run properly....

 

[Kneejerk Bombas]

Rest assured it's something very expensive.
Nobody sells a $1000 saw on ebay, not running, if it's a simple fix.

 

[sILlogger]

impulse hose??

im not sure of this impulse hose that u speak of, ive prolly dealt with it before just have a different name for it. thanks

how do u perform a vac test, wd40 around the seals??

 

[bcorradi]

If it was me... I'd take it from the top down... compression, pressure and vac test... , carb, etc.. Too many unknowns in a used saw that doesn't run properly....

I agree with Andy on most normal circumstances. The only reason why i thought the best route for him would be to check fuel delivery issues was because he is planning on reringing it. Because of this, it won't help much for him to check the compression or do the pressure/vaccuum test before he rerings it, since it will need to be redone once he rerings it. The carb, fuel line, filter, impulse hose etc should be checked regardless.

If he is undecided on if he is going to rering it, I would definately follow andy's gameplan.

 

[bcorradi]

im not sure of this impulse hose that u speak of, ive prolly dealt with it before just have a different name for it. thanks

how do u perform a vac test, wd40 around the seals??

The impulse hose is a rubber hose that attaches to a brass fitting on the lower part of the crankcase and goes to the carb. Its more or less responsible for pumping the fuel out of the tank into the combustion chamber.

Stihl sells the required tools for doing the pressure/vaccum test, but there are few people on here that have made there own using blood pressure testers.

There are also some people that use some backyard techniques for testing for air leaks.
1) While the saw is running spray WD40 around the base gasket and seals to see if it kills the saw. If it does then you know where the source is.

2) Seal off the intake and exhaust port. Now rub soapy water around the base gasket and around the seals. Pressurize the crankcase and look for any bubbling around the seals or base gasket.

If your goal is only to repair this saw then you may be able to get by using a backyard technique not testing it at all. If you plan on repairing more saws in the future, you would be best building your own tester or purchasing the tools from stihl.

 

[bcorradi]

Rest assured it's something very expensive.
Nobody sells a $1000 saw on ebay, not running, if it's a simple fix.

Wow you are optimistice lol.

 

[sILlogger]

Ohhh!!! The Impulse Hose!!!

i didn't know that was what they thingy was called!!! well know i know, u learn something new every day. anybody know any tricks for for testing the fuel line for leaks? you guy are tons of help, thank you!!

 

[Lakeside53]

Disconnect the in-tank filter, plug in a pressure tester ($20-$30) and pump it up to 8psi. That will test your hose and carb metering needle.

 

[sILlogger]

running like a top

i tore into the saw and found out that the cylinder bolts were loose, i pulled the jug honed the cylinder and reringed it, cleaned everything up, put it back together and and fired it up in a couple pulls, reset the carb and now i runs like a top. Once again thanks for all of the imput

 

[RiverRat2]

Cool,,,,

i tore into the saw and found out that the cylinder bolts were loose, i pulled the jug honed the cylinder and reringed it, cleaned everything up, put it back together and and fired it up in a couple pulls, reset the carb and now i runs like a top. Once again thanks for all of the imput

dont ya just love it when a plan comes together