Chainsaw Repair

HT-5 and later had governor circuits and other things not condusive to performance applications for or my usage..

 The carb on the 088 is HT-12 so does that change up the carb kit needed?

Rk24HS Tillotson kits most of them.

The HT was built using the HS metering parts and pump parts,same carb kit applied.

HT-12 uses a different kit again. Dont recall using that on in the  1 3 5 7 thinking needles were different when I was doing them, one you mentioned. Just a WAG

It does list a 084 though too.  But not the carb 1 3 5 7 etc

OEM Carburetor Kit / Stihl 1124 007 1060
Pack Size:1
Tillotson RK-28H , Stihl 1124 007 1060

Stihl TS400 and TS460 Cutquik Saws, 084, 088 and MS880 chainsaws; Tillotson HS-274A thru E, HS-275, HS-275A, HS-275B, HS-276A thru D, HS-279A thru D, HS-301A, HS-301B, HS-306A, HS-307A, HS-315A thru C, HS-317A, HS-317B, HS-320A, HT-11A thru D, HT-12A thru E, HT-15A and HT-18A
Ethanol: Not compatible with greater than 10% ethanol fuel

I remember now also the needle in the 1 3 5 7 was different too.    Why this kit offers 2.   Least from what I recall.

I buy all my kits with the ethanol resistant check valve side dias.

Although more costly my choice is always the Tsumura bars,much higher quality and harder steel(Very hard!),and the groove is tighter and more precise from new. The Stihl bar is my #2 choice for sure. I used to measure the groove of various brand new bars,Tsumura was always the tightest.
I still have a collection of early Ht1 to Ht4 carbs I don't need anymore,and 084 intake boots and auxiliary fuel pumps.

I would use the carb kit with the teflon pump diaphragm for U.S. fuels,on any Ht or HS carb.