455 Rancher to 460 Rebuild, Carb Idle Adjustment issues

[Bratzsman]

Hello All,

I completed my 1st ever 455 rancher rebuild this morning. I ordered a OEM 49mm cylinder kit from Baileys Online and the assembly when very well. The larger piston and cylinder makes the saw a 460(correct me if i am wrong).I am able to start the saw without issue. However the engine idles very high. When I attempt to adjust the idle speed down the saw dies. there is about a 1/8 of a turn between high idle speed and the saw dying. I took off the top cover and made sure when I turned the idle screw it moved the arm on the opposite side of the card( sorry I don't know the correct terminology) I have tried adjusting the low speed jet but it seem to have no effect on the idle. Currently I have the low speed set to mid range and the high speed jet set to mid range and the saw starts up fine. I have a few questions.
1) I am using the original carb is this ok or do I need to purchase a different carb?
2) If I can use the original carb will I need to remove the factory installed adjustment stops in order to get the carb into adjustment?
3) Am I missing something else simple?

One last thing, I took the advise from other members about adding extra oil to the first tank of gas during the break in period. I added about 1 teaspoon.

This is the 1st time I have rebuild a saw. I have next to no experience adjusting carbs. Any tips would be appreciated!

Thanks

Matt  

[sawguy21]

It sounds like you have an intake air leak which may be why you had to rebuild. With the bar and chain removed and the engine running spray carb and choke cleaner (ether is NOT recommended) around the shaft behind the clutch and behind the carburetor. If the engine changes pitch you have found a source.

[Bratzsman]

Thanks Saw Guy I will give that a try ASAP. I rebuild the saw due to a loss of compression. When i had the saw apart i found pitting on the cylinder wall. I was using it to mill. I know the saw is to small and i knew i could damage it but i love milling. Looking to buy a bigger saw soon but need the husky for bucking my firewood. 

Thanks for the tip i will let you know what i find.

[Bratzsman]

YES! You called it SawGuy!!! Sprayed behind the carb and the saw almost died. I will pull it apart and try again! thanks!! this site is a great source for troubleshooting!!