Tech Talk TM40 Lighter Return Spring Install

In this Tech Talk, Mike covers the removal and installation of a lighter throttle return spring for a Mikuni TM40 carburetor. It's a fairly straight forward process with minimal tools needed to complete the installation.
If you have a TM40 on your bike and you seem to be getting "wrist pump" or are having a harder time doing longer rides, a lighter return spring might be the solution for you. These carbs were designed to fit into a Harley frame and motor with a heavier pull, not a smaller motorcycle like a dual sport where your riding position and demand on the throttle constantly is changing, thus creating more fatigue on the rider.
If you're interested in getting one for your TM40 or would like to purchase a TM40, or TM40 components for yourself, follow these links below and thank you for watching.
Remember, your adventure begins here!
TM40 Listing: procycle.us/product?search=TM40
TM40 Lighter Throttle Return Spring: procycle.us/product/2521-carb...
If you need parts for your dual sport or adventure bike, give us a call / text (541-688-9543), shoot us an email ([e-mail]), or visit our website WWW.PROCYCLE.US
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[@RGB872]

I could have used this a few months back. Watching it, I’m glad I’m not the only one who struggled with this. Not the easiest job. 😅

[@stevestewart7572]

Awesome! Took longer to watch the video than it did to do the job. Thanks!

[@TeamProCycle]

Glad it helped!

[@jensenmiller6410]

Thanks Mike! I've been meaning to install the spring I git from you for a bit. This should make things go smoothly.

[@TeamProCycle]

It's a fairly easy installation if you take your time. The biggest hurdle will be keeping tension on the throttle cam and aligning the holes for your pin to go through while installing. Shoving a small hex key into the hole to keep the throttle cam locked in place is very helpful during reassembly.

[@duelmen3]

If you have a small pair of Channel Lock Pliers, you can use them on the roll pin for a much easier installation by squeezing it into place. Just make sure the alignment of the pin is good.

[@TeamProCycle]

That's a good tip! Thank you for sharing and thanks for watching.

[@kevinm1179]

At 2:52 when that circular disk that you twist on the return spring, when lined up with the punch hole it doesn’t hit the stopper on the bracket when let go? Is that how it’s supposed to be?

[@napper1496]

What’s the story with the pump rod sticking? My new tm40 is only 3weeks old and the rods started to stick and nothing is near it . The only thing I can see is the little rubber sleeve at the bottom that seems to have stretched and is stopping it retracting back properly and as quick as it should be. Bit bad this carb isn’t even a month old

[@TeamProCycle]

That's a great question. We've never come across this personally to evaluate the problem, but have heard of others having this issue. However, I haven't seen any remedies / reasons online. I would pull the float bowl off and start inspecting everything for the culprit. I suspect something is slowing the plunger from returning to the up-right position. If you need further help after inspection, please give us a call, text, or send us an email and we will help get you situated.

[@scotthinton4610]

Didn't even come out with a sledgehammer. Better to just deal with it than break the carb.

[@scotthinton4610]

Finally managed to get it done. Sprayed carb cleaner in there and eventually it loosened it up. Lots of dirt. Thanks for the helpful video!

[@TeamProCycle]

We're glad to know you were able to get it replaced and thank you for watching. If you ever need help with anything in the future, please reach out to us and we'll do our best to take care of you.