Hybrid Build

[KG441c]

I believe 66

Wonder if thats the largest for 440/460 without drilling?

 

[Adirondackstihl]

From what I can tell, the HD16 & 17 have an 0.70 main

 

[Trx250r180]

From what I can tell, the HD16 & 17 have an 0.70 main

Is the model # on the carb ,or do you have any pics of the different models ? I think my saws have the walbro type with snorkel on top ,and springs you can see around the screws ,no red caps .

 

[KG441c]

Is the model # on the carb ,or do you have any pics of the different models ? I think my saws have the walbro type with snorkel on top ,and springs you can see around the screws ,no red caps .

Model is on front left side of adjusters on the Walbros

 

[Trx250r180]

Hd15 sound right ? one on the left ,the rh one is an aftermarket zama i was comparing it too

Whatever jet is inside ,it tunes out nice on the hybrid about 1 turn out on each screw

 

[Adirondackstihl]

View attachment 466737

Hd15 sound right ? one on the left ,the rh one is an aftermarket zama i was comparing it too

Whatever jet is inside ,it tunes out nice on the hybrid about 1 turn out on each screw

HD15 had 0.66 main.
So there's proof that bigger isn't alway better or necessary

 

[KG441c]

Can larger main jets be bought and if so does the orfice underneath need any mods?

 

[KG441c]

HD15 had 0.66 main.
So there's proof that bigger isn't alway better or necessary

Jeremy both my 17a & b both have 66 mains from the factory and is more than enough

 

[big t double]

Can larger main jets be bought and if so does the orfice underneath need any mods?

1128 121 5602 is the part number for the .70. should screw right in to any of the carbs listed.

 

[Adirondackstihl]

Jeremy both my 17a & b both have 66 mains from the factory and is more than enough

Yeah
I'm with ya there.
I had a 16 and at 1 turn, was rich on the hybrid

 

[KG441c]

1128 121 5602 is the part number for the .70. should screw right in to any of the carbs listed.

Thanks

 

[Deets066]

I'm curious what the difference in Venturi size is between all these carbs.

I'm guessing that 70 would be overkill on a hybrid. My 066 ran a 62 for years, now it has a 74 and is tuned to 13,100 at 1/2 turn out.

 

[Deets066]

Velocity increase can also cause you to have to close the jet more after porting than before.

I've noticed that too, more so with velocity decrease. Such as a bigger or lower intake will need more fuel

 

[Stihlofadeal64]

Hybrids, hybrids bring on the Hybrids

 

[Deets066]

Hybrids, hybrids bring on the Hybrids

Yeah... What he said

 

[Mastermind]

Damn

You bastard are gonna suck me into talking about fuggin saws.

The main jet size ain't as important as some folks might think. Two paths to the main nozzle. One through a fixed jet, the other through the HS needle.

I drill the main jet on the 461 because if not the HS screw ends up way too far out....

 

[KG441c]

 

[redfin]

I drill the main jet on the 461 because if not the HS screw ends up way too far out....

Show me/us please. I aint never been that far into a carb. How the heck do you do that?

 

[redfin]

And Jeremy, thanks for letting your thread wonder. I like to pick up all thats thrown down when threads arnt "on topic" sometimes.

 

[huskihl]

And Jeremy, thanks for letting your thread wonder. I like to pick up all thats thrown down when threads arnt "on topic" sometimes.

Me too. I get outta hand sometimes. Just whip me back into my cage. I'll be alright