MS290 big bore kit carb jet

[msmmce1]

Just rebuilt my 2005 MS290 with a Hipa MS390 kit, anyone know where I can get the larger carb jet that comes in the MS390?
Thanks

 

[HarleyT]

Stihl dealer??

 

[HarleyT]

1122 121 5606 0.65
1127 121 5602 0.58
1130 121 5600 0.54

 

[huskihl]

I doubt it'll be necessary. It only equates to 1/8 to 1/4 turn out on the H jet

 

[Stihldoc]

Yes, and no.
The high speed needle is just fine-tuning. 90% of the fuel flow is through the fixed jet. The needle only adjusts the final 10%. If you big-bore a -290, opt for the -310 fixed jet so you don't run it lean. If its a really big-bore, opt for the -390 fixed jet. The needle valve will get the engine enough fuel under no load, but once its in the wood, you really need the correct fuel delivery of the correct fixed jet. These jets are under $5 at the dealer.
If you're not willing to do it right, why are you doing it?

 

[Dub11]

I doubt it'll be necessary. It only equates to 1/8 to 1/4 turn out on the H jet

You get out of here with your logic!

044 carb ftw!

 

[huskihl]

If you're not willing to do it right, why are you doing it?

It's not that one way is right versus the other being wrong. When the oems choose these carburetors they have a pretty good idea from the testing they've done in the past. If you're not using an oem big bore, you have no idea that it's actually going to require more fuel then the one you're replacing

 

[msmmce1]

Yes, and no.
The high speed needle is just fine-tuning. 90% of the fuel flow is through the fixed jet. The needle only adjusts the final 10%. If you big-bore a -290, opt for the -310 fixed jet so you don't run it lean. If its a really big-bore, opt for the -390 fixed jet. The needle valve will get the engine enough fuel under no load, but once its in the wood, you really need the correct fuel delivery of the correct fixed jet. These jets are under $5 at the dealer.
If you're not willing to do it right, why are you doing it?

Do you know the size or PN of the correct jet? (for the 390)Thanks

 

[msmmce1]

1122 121 5606 0.65
1127 121 5602 0.58
1130 121 5600 0.54

Thank you!

 

[msmmce1]

1122 121 5606 0.65
1127 121 5602 0.58
1130 121 5600 0.54

Any idea where to get one?(.65) Stihl is out of stock

 

[HarleyT]

Any idea where to get one?(.65) Stihl is out of stock

Your dealer? The dist.?

 

[msmmce1]

Your dealer? The dist.?

My local dealer does not have one and Stihl is out of stock.

 

[HarleyT]

Looking it up in the mediacat:
1122 121 5606
Fixed jet .065
available in Brazil only MS390

 

[user 122190]

Which part is this jet?

 

[HarleyT]

33

 

[HarleyT]

On this carb in the ipl:
1127 120 0651

 

[Chainsaw Jim]

It would be faster and cheaper to get the right size micro drill bit and drill it out yourself.
A high quality .65mm drill bit is only like 2 bucks at the fastener supply stores.