McFarlane Aviation Products

Part Number: 7235

SPRING, Throttle, Rotax, Blue, Right

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Product Details

Rotax Throttle Return Springs
Stop throttle creep!

A common complaint about the Rotax 912/914 engines is that the throttle return springs are too strong. McFarlane stocks a variety of springs so you can choose the one that best fits your application. All McFarlane throttle controls for Rotax engines include P/N 7140 springs.

Unique hook design for left and right applications provides for better fit and retention.

New design limits potential contact with adjacent parts

Less than half the strength of the original stock Rotax springs
Tailored for Rotax engines, including the Vans RV-12 aircraft
Prevents throttle "creep" due to excessive return spring force
Requires 1 per carburetor (2 per engine)

Spring P/N	Relaxed Spring Length (max in)	Approx. Pre Load (lbf)	Spring Rate (lbf/in)
6822, Red, Left	1.6	1.5	2.1-2.7
7235, Blue, Right	1.6	1.5	2.1-2.7
Rotax Original	1.8 (approx.)	2.0	8-12 (approx.)

Note: Installer is responsible for determining whether this spring is an appropriate substitution for their application. For use on non-certified aircraft.

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Frequently Asked Questions

Question
I purchased a laser engraved knob and the thickness of the marking is very shallow. What kind of wear resistance can I expect? The laser marking does not harm the hard durable anodize coating on the aluminum knob. The CO2 laser process only bleaches the color from the anodizing leaving a silver white color that contrasts with the surrounding dyed anodize. The durability of the laser marked area is not affected by the laser. Our tests have shown that the laser process actually improves the corrosion resistance of the anodize layer. The CO2 laser engraves aluminum knobs by vaporizing the surface leaving a deep durable groove. This groove is then filled with a special paint for contrast. The result is a durable long lasting mark.
Why is my new engine control too long/short? There are several things that could be different such as engine/aircraft modifications, rigging/clocking of control arm or adjustment of rod end will be needed, placement of clamps or brackets may be different, or a previous installation change such as routing from original.
What is the minimum bend radius for my engine control? McFarlane's Storage and Packaging Specification requires a specific packaging minimum radius based on the length of the control, type of wire used, and the configuration of the control end(s). Please contact us to determine the exact requirements for your specific control.
How do I trim my engine control to length? Please reference the Installation Instructions included with your new control.
My Vernier-Assist Throttle control came apart during installation or maintenance. Can it be put back together? Yes, this is common and can put back together, provided no components are missing. Please watch the Vernier-Assist Assembly Video for details.
How do I clean and sanitize a McFarlane Push-Pull Control? We make the following cleaning and sanitizing recommendations to be completed between flights: Recommended Cleaning Process 1. Put on clean disposable gloves prior to cleaning and disinfection. 2. Pull controls back to the fully retracted position to expose the full length of the control shafts. 3. Apply isopropyl alcohol to a clean microfiber towel. Do not spray any solution directly on the controls or any other surfaces or components in the aircraft. !!! WARNING: DO NOT USE BLEACH WIPES ON ANY MCFARLANE CONTROL !!! 4. Gently and thoroughly wipe down every control knob surface and control shaft. 5. Let cleaning solution dry on these surfaces (contact time). 6. Use a clean and dry microfiber cloth to wipe away any solution residue left on knob and control shaft surface. 7. Remove all gloves, towels, and cleaning supplies from the work area in the aircraft. Please contact McFarlane Sales directly at 866-920-2741 or 785-594-2741 or sales@mcfarlaneaviation.com if you have any additional questions regarding the disinfection of our controls.