How many throttles does a Mikuni HS40 have?
The main system becomes the important mixture control from about 1/4 throttle. The main system has three tunable parts: 1) NEEDLE JET — controls mixture from 1/16 to approxi- mately 1/4 throttle (varies with needle position).
What happens when the throttle is pulled out on a Mikuni?
If the throttle is opened with the choke knob pulled out, air essentially ceases to flow through the starter system and it stops delivering its rich mixture to the engine. If the engine begins to load-up while the starter system is engaged, it may be cleared by opening the throt- tle.
What happens if the float level is too high on a Mikuni?
If you have doubts, check the float level and re-adjust if needed. A float level that is too high can make fine tuning of the idle circuit impossible. One that is too low will have a similar effect on mid-range tuning.
How can I change the idle circuit on my Mikuni?
The idle circuit can be adjusted by changing either the pilot or the pilot air jet. A one-size larger pilot jet will have nearly the same effect as a one-size smaller pilot air jet. It is generally easier to change the air jet since it is more accessible.
The main system becomes the important mixture control from about 1/4 throttle. The main system has three tunable parts: 1) NEEDLE JET — controls mixture from 1/16 to approxi- mately 1/4 throttle (varies with needle position).
What kind of throttle cable does Mikuni use?
Mikuni HSR Series Carburetor Kits HSR Carbs use stock Harley-Davidson throttle cables. The latest 42/45/48mm smoothbore carburetors from Mikuni install quickly using the original stock throttle cables. The HSR flatslide carb delivers excellent throttle response and control.
Why is Mikuni TM series flat slide carburetor so good?
Air flows faster, smoother through the for TM Series venturi and jet blocks due to the flat slide design which help create a smooth bore effect. The high velocity air flow means a stronger vacuum at the needle jet for more precise metering, better throttle response.
Can a Mikuni tm40 be used on a Harley Evo?
This is a high quality reproduction of the Mikuni TM40 carburetors. They were originally produced in the mid-80’s to substantially upgrade the performance of the Harley evo bikes having the oem butterfly carbs. They can also be used on Dr650s and some others but you have to change the jetting. Information can be found on the bike forums for this.