254xp carb

[Davie Mac]

I am looking for someone to rebuild a carb from a 254xp. The carb is a Walbro HDA 35B and has a few issues. The saw does not lean off enough on the "H" screw and runs rich/bogs down at top end. I believe there is a valve somewhere on the carb that when worn, leaks fuel past causing the saw to run rich. Is there an expert out there who I could send the carb to for refurb? This is my everyday saw and needs to be good. A fully refurbished carb would be nice!

Edited January 14, 2014 by Davie Mac
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[Davie Mac]

Apparently, a 262xp carb will be a straight fit and is a better option? Part number HDA 120 I think. Looking for advice.

[TreeswingerPerth]

There's a brand new carb from the States on ebay , Pantano power equipment

eBay item number:380699686158

[spudulike]

I am looking for someone to rebuild a carb from a 254xp. The carb is a Walbro HDA 35B and has a few issues. The saw does not lean off enough on the "H" screw and runs rich/bogs down at top end. I believe there is a valve somewhere on the carb that when worn, leaks fuel past causing the saw to run rich. Is there an expert out there who I could send the carb to for refurb? This is my everyday saw and needs to be good. A fully refurbished carb would be nice!

 

It is possible that the L screw is set badly rich and this is affecting the richness of the H screw at the top end. Set both on 3/4s out and try that and be prepared to wind the H screw out a little more as standard is 1 turn on each.

 

The valve you are talking about is probably the high speed check valve - some times these can be driven out and replaced and sometimes not - a good Ultrasonic Cleaner will often resolve the issues as it will cavitate clean all the crevices in the carb.

 

It is also possible the metering arm is set too high or the needle is leaking a little - is the metering arm spring inserted correctly?

Edited January 14, 2014 by spudulike

[SawTroll]

The recommended base adjustment for the 254xp is H=1 1/2, L=1 1/4 . which is a bit unusual.

 

The HDA-35 ha a venturi of only 13.5mm, which is small for a 54cc saw - so a larger carb may well be a good ide, like a HDA-120 or even a HDA-87....

Edited January 15, 2014 by SawTroll