TEMPA FLOW INSTALLATION AND USE (05/11/02)

TEMPA FLOW INSTALLATION AND USE

READ AND UNDERSTAND THESE INSTRUCTIONS BEFORE INSTALLING

Please read instruction’s until you fully understand the installation, your (baby) relies on you!

Success of mods relies on the quality of workmanship and knowledge!

Safety Considerations: Gasoline is flammable and explosive. Do not smoke or allow open flames or sparks near areas where gasoline is used. If you get gasoline in your eyes swallow gasoline, get immediate medical attention. If you spill gasoline on your skin or clothing, wash immediately with soap and water and change clothing. Never run the engine in enclosed area. Exhaust fumes are poisonous and can result in loss of consciousness and death in a short time. When drilling, wear safety glasses. Do not drill where sparks can reach gasoline. To avoid injury, always check free throttle operation before starting engine. THIS PRODUCT IS NOT FOR AIRCRAFT USE.

WARNING: Installation/use of this product requires mechanical and carburetor tuning skills and may result in engine damage caused by decreased fuel flow. .We are unable to verify every application and installation of this product; verify proper fuel flow using EGT, piston, and/or plug readings. This is your responsibility.
Principle of Operation: This carburetor compensator decreases fuel flow by applying a regulated vacuum to the float bowls.

INSTALLATION

1. Determine Your Existing Carb Venting: Carbs have one or more vent (overflow) fittings located above their float bowls. In air box venting, these fittings are connected to the air box (normally tubes connected to air box hose barbs). For this product, all other venting is considered outside air box venting. (Note: Some Arctic Cat’s have enrichment circuit air tubes run to the air box; these are not venting tubes).

2. Carb Jetting: Your carbs should be jetted (main jets AND NEEDLES) for your lowest operating altitude and normally -20F (-29C). You can also jet for -40F (-40C) or 0F (-18C) (see 8.). This product works with almost all modifications if properly jetted. A fast idle or low throttle hesitation indicates the pilot circuit needs enrichened slightly.

3. Install Vacuum Source per attached sheet. Always before starting engine verify free throttle movement.

4. Install the Compensator and Air Inlet: The air inlet is the 1/2” hose barb on the end opposite the screw head. The inlet tubing if used should not be crimped or restricted and no foreign material should be allowed in the inlet barb; this will cause the engine to run lean. An optional filter is available for extreme cases of snow or belt dust but must be cleaned/ replaced if extremely contaminated. Insert the inlet tube into the filter until it bottoms against the filter’s spring and securely tie-wrap. A 3/8” trade size (for 1/2” o.d.) copper tubing elbow (only) may be used for tight bends.

4a. Outside Air Box Venting (see 1.) Mount the compensator in the upper portion of the air box by drilling a 9/16” hole in an air box wall, insert the outlet end (screw head end) of the compensator through from the inside, and secure with an approximately 1.75” piece of 1/2” i.d. tubing and a clamp. DO NOT LOCATE THE AIR INLET INSIDE THE AIR BOX IF YOU HAD OUTSIDE AIR BOX VENTING; this will lean your baseline jetting causing engine damage. A good air inlet location in this case is between the air box and the fuel tank. Do not locate the air inlet near engine or exhaust heat. Use 1/2” inlet tubing to locate the air inlet outside the box (lower than the compensator) and terminate with the 1/2” tee (the bulkhead fitting may be used for tight locations). If using Carb filters, place the compensator in the upper back of the engine compartment away from exhaust heat and locate the air inlet there.

4b. Air Box Venting ONLY (see 1.) Mount the compensator as in 4a. The air inlet must be in the same air box compartment as the original factory vent fittings. For instance, if your vent fittings are under a single shelf, the air inlet must be under this shelf. Use 1/2” inlet tubing as necessary. If you have no shelves (gutted air box) anywhere in the box will work. It is not necessary to cap the factory vent tube barbs.

5. Outlet: Install the reducer fitting into the 1/2” i.d. tubing on the outlet end of the compensator placing it at least 3/8” from the end of the plastic screw head. Remove it to adjust the screw. Connect the reducer fitting to the vacuum source using 22-26” of 1/4” i.d. tubing (outlet tube length affects operation).

6. Install Float Bowl (Vent) Lines (5/32” i.d. tubing). The entire system must be leak-free. Flooding or extreme riding can result in fuel in the float bowl lines; tube routing should be uphill from the carbs so the lines will completely drain. Any fuel in the lines will result in erratic operation. For extreme riding, one-way valves from Holtzman Engineering, Inc. (only) can be placed at each Carb float bowl (overflow) fitting (but are rarely needed). Rarely carbs have an overflow standpipe drain; if present it must be sealed or connected to a one-way valve from Holtzman Engineering, Inc. (only). If your Carb vent fittings are too small to seal to the 5/32” tubing supplied, 1/8” tubing (and optionally 1/8” tees), not supplied, may be used.

TUNING AND USE

7. The Plastic Screw Setting is indicated by a dot on the compensator (see schematic). If you are jetted for -20F (-29C) (2. above) your target position for the slot is the dot; if jetted for -40F (-40C), the target position is 1/8 turn counterclockwise from the dot.

8. Testing for Proper Fuel Flow: AS AN INITIAL PRECAUTION, turn the screw 1/8 turn clockwise from your target position (see 7.). NEVER ROTATE THE SCREW MORE THAN 1/8 TURN CLOCKWISE FROM THE DOT or screw damage may result. At the lowest altitude at which you ride, run the engine at several throttle positions and temperatures; check fuel flow using plug/ piston/ EGT readings. Fuel flow should be a little rich; if so, turn screw 1/8 turn counterclockwise (to the target position). If fuel flow is still too rich, the screw can be rotated another 1/8 turn counterclockwise. At the lowest altitude at which you ride the screw should be within +/- 1/8 turn of your target position. Adjust Carb jetting as necessary to obtain this setting.

9. Altitude Adjustment: The altitude adjustment is approximately 1/8 turn counterclockwise on the screw for every 2000 foot (600 meter) increase in elevation above the altitude to which you are jetted, effective up to a 6000 foot change depending on the temperature. Don’t forget to turn the screw back when descending. If desired, you can remove all but one of the 1/4” hose barbs and drill the reducer fitting to .203” (13/64) to give an 8000 foot range.

10. Warm Drive-Away: For the first mile (longer if the regulator body is not in the air box) after moving from warm storage or stopping for a break, do not run the engine at extended high load but occasionally vary the throttle position.

LIMITED WARRANTY: The installation of this device requires mechanical and carburetor tuning skill. Because of the custom nature and the limitless application variables this product is subject to, this product is sold with a limited warranty only. Holtzman Engineering, Inc. makes no warranty of any kind except we will replace this product if found to be defective in material or workmanship for one year from date of purchase. Holtzman Engineering, Inc. will not be held liable for any injuries or damages incurred as a result of the installation or use of this product nor the parts this product may affect.