6 replies to this topic

[ScottB]

Hi,

 

I'm playing with a VK (?) Rochester (17084595 1464 JHT). I have a rebuild kit to put in and I've disassembled the carb today.

 

This model has an internal adjustable APT screw to set part throttle mixture I believe.

 

Being a newbie knucklehead, I didn't note the number of turns out from seated before removal. Plus I think someone has already been into the carb so who knows how it was set!

 

Is there any way to get the factory setting from somewhere? Or a close starting point?

 

Thanks

Scott

[arrimar]

Go to Ross at Carbotune Tweed Heads.
He'll set it up properly.

[ScottB]

Thanks arrimar. I'll keep him in mind.

[rodomo]

Try in till it seats then back out 3/4 turn. Worked on ol' strommies as a starter position?

 

*Disclaimer............might have been 1 and 3/4 turns.................been a while

[Dr Terry]

Try in till it seats then back out 3/4 turn. Worked on ol' strommies as a starter position?

 

*Disclaimer............might have been 1 and 3/4 turns.................been a while

Different screw, I don't think that Scott if referring to the idle mixture screws.

 

AFAIK the APT screw in Qjets sets the lower height of the primary piston.

 

Dr Terry

[warrenm]

That is correct Dr Terry.

This may help, I've got this in books, but this gives a good description.

Edited by warrenm, 24 April 2021 - 12:00 AM.

[ScottB]

Thanks for the info.

 

Yeah I've been searching the net for videos and opinions on the setting point. Thanks for posting that video warrenm, it's a good explanation. So far I've read set points anywhere from 2 to 4 full turns out from seated. So I reckon I'll pick 3 turns as a start point.

 

I have ordered the grub screw kit from the US. So at least I'll be able to tune it once the engine starts.

 

Scott