Tillotson HR 36A Carburetor

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The outstanding links below will make rebuilding, adjusting and maintaining your Tillotson carburetor easy.

1.)  Click the link for a nice exploded diagram of the Tillotson HR 36A carburetor.  http://www.mercurysnowmobiles.com/pdf/hr.pdf 

(Once it loads as a PDF document, you can hit the print button, print it out and save it in your manual)

2.)  Click the links for two super nice write ups with color photos on the rebuilding of the Tillotson HR 36A carburetor.  It doesn't get any better than this!   http://www.aerocorsair.com/id27.htm  and http://www.aerocorsair.com/id28.htm  

3.)  Click the link for a parts list page with clickable links to see the parts photos for the Tillotson HR 36A carburetor. http://www.mfgsupply.com/m/c/allparts/1.html 

Adjusting the Tillotson HR 36A carburetor made easy:
  • The carburetor has 2 adjustment screws on the left (when you're facing the mounted carb) side.  They are labeled "L" and "H" for "low speed mixture" and "high speed mixture."   Initially, set these at 3/4 of a turn out from full in. 
  • The carburetor has 1 idle adjustment screw on the top right side (when you're facing the mounted carburetor).  Initially, turn this screw out (counter-clockwise) until it's no longer touching the throttle linkage.  Then turn it in (clockwise) about 2 turns after it touches the throttle linkage.
  • To start the engine, use full choke.  Crank the starter in 10-15second bursts until the engine fires on the choke.  Then turn the choke off, crack the trottle open a bit, and crank until it fires up.   If it doesn't start, use the choke again.
  • Once you have the engine running, adjust the idle speed screw on the right so you have a fast idle, about 1,500rpm or so.  Then, in small increments, move the low speed screw (the screw closest to the engine) in or out to find the best idle speed.  Once you find the best/fastest idle, move the screw just a tiny bit outward.  That way you are just a tad on the rich side at idle.  You don't have to move the screw very far.
  • When you get out on the water, run it at full speed.  You can flip the seat up, stand at the rear with the seat open and still steer.  In this position, with the engine running full throttle, turn the high speed screw in small increments until you get the best scream out of the engine.  You'll know the sweet spot when you find it.  Again, once you find this sweet spot, move the screw out just a tiny bit.  Not so much as to loose that scream, but just to the point where you're on the edge of where that scream starts to break.  In this position you'll be at a safe full throttle mixture that won't be too lean.

Mixing The Fuel To Oil Ratio:

  • The original mix ratio using conventional/standard 2 stroke oil was 20:1.
  • I use Torco Synthetic 2 stroke oil at 40:1 with excellent results.  The Torco is smokeless and by running less oil per volumn of fuel you get more power(better combustion) out the engine.  I highly recommend synthetics!

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