HDA 87 alternatives?

[decableguy2000]

I have pondering on a HDA 87 (for a Husqvarna 262) alternative. These rare and expensive. I was thinking it may be possible to tune a HDA 198 into a 87 by changing the check valve, (new) and the shafts from a HDA 120. About the only thing I'm not sure about would be the needles. Its just an idea and not a need. I have plenty of other broke thins to tinker on.

Jeremy

 

[Jimmy in NC]

I have pondering on a HDA 87 (for a Husqvarna 262) alternative. These rare and expensive. I was thinking it may be possible to tune a HDA 198 into a 87 by changing the check valve, (new) and the shafts from a HDA 120. About the only thing I'm not sure about would be the needles. Its just an idea and not a need. I have plenty of other broke thins to tinker on.

Jeremy

I ran a heavily ported 262 Friday. Changing from stock carb to 87 was marginally better....most wouldn't notice. The stock /later carb was feeding it while pulling 20" 3/8 burried...doing just fine. I wouldn't sweat it if you don't have an 87 unless the saw is wildly ported with bridges and such. Standard woods port you'll never see it.

 

[wigglesworth]

Open up the Venturi on a 120.

Ta da!!

Instant 87....

There might be a different nozzle in em, but somebody would have to confirm. The 87 has a #40 nozzle.

 

[Warped5]

Me thinx we need @super3 to show up here ...

 

[Jacob J.]

There was a member here that finagled a Tillotson HS-226 onto his 262 and it was a pretty wild runner (lots of port work.) I remember it being a lot of work.

 

[wcorey]

Other 16.66mm alternatives include;
HDA 175
HDA 191
HDA 190
HDA 199

 

[Totembear]

Do these carbs need to be worked on or are they fine to run as is?

 

[decableguy2000]

There is no real need for it, I was thinking about it after working on PP 330 with a HDA 164 (witch the nozzles and the carb are NLA) and the 134 is NLA for this saw and I was thinking what I can do to come up with other options.

Jeremy

 

[decableguy2000]

Do these carbs need to be worked on or are they fine to run as is?

I would think the throttle & choke shaft would have to changed so the controls would work I'm unsure about the jet sizes and the newer ones will have limit caps like a HDA 144.


Jeremy

 

[super3]

There might be a different nozzle in em, but somebody would have to confirm. The 87 has a #40 nozzle.

The 120 is a #56.
Most of the metering passages are larger in the 120 also.

 

[wigglesworth]

The 120 is a #56.
Most of the metering passages are larger in the 120 also.

IIRC, the 164 has a #60!!

Been a few days though....

Carbs are a mystery to most, including myself. I'm still scratching the surface on em....

If picked up a bit of "theory" over the years though.

14.7 : 1 or bust!!!

 

[decableguy2000]

Carbs are a mystery to most, including myself.

Man I concur. I'm trying to learn these little things. I hate not being able to fix some and tossing them. But do you do when nothing is available anymore toss a good saw for a bad carb?

Jeremy