EFM Autoclutch

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doakley
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EFM Autoclutch

Post by doakley » 02:39 pm Oct 26 2018

Question for those of you with an autoclutch. I’m have a problem with the bike overheating (99 220). Gary at EFM felt it is because I’m riding in too tall of a gear and letting the clutch slip too much. He suggested switching to ATF which he feels doesn’t hold the heat from the clutch as much but mostly riding it at higher rpms to engage the clutch harder. I’m racing it the next two weekends, a hare scramble and an Enduro in AL. I just wondered if anyone else experienced this.

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Re: EFM Autoclutch

Post by John_S » 08:09 pm Oct 26 2018

I don't have auto clutch experience but both my KDX and ATC were getting hot and new radiator caps fixed them.

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Re: EFM Autoclutch

Post by Timtee » 09:45 pm Oct 26 2018

I have had Rekluse clutches in both my KDXs and no overheating. I also use ATF type F.

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Re: EFM Autoclutch

Post by doakley » 08:35 am Oct 27 2018

John_S wrote:I don't have auto clutch experience but both my KDX and ATC were getting hot and new radiator caps fixed them.
So how did new radiator caps fix the problem? Bad thermostat?

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Re: EFM Autoclutch

Post by John_S » 12:53 pm Oct 27 2018

doakley wrote:
John_S wrote:I don't have auto clutch experience but both my KDX and ATC were getting hot and new radiator caps fixed them.
So how did new radiator caps fix the problem? Bad thermostat?
Sorry I don't know technically. I think it has to do with system pressure and the spring being worn out. Unfortunately for me it was the last thing I replaced on the ATC after a water pump rebuild and hoses didn't make a difference. When the kdx started getting hotter than normal on a few rides I would pull off and let it cool down. I started that fix with a new cap and it was back to normal.

It may not be your problem but it's worth a shot considering it's cheap. I went to the nearest dealer which is Suzuki and grabbed one. The guy there told me most Japanese bikes use the same basic cap.

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EFM Autoclutch

Post by SS109 » 09:51 pm Oct 27 2018

When I had the Dyna-Ring in my old E-series I was running ATF, larger aftermarket radiators, and a higher pressure radiator cap yet still could overheat it. Never had that problem with the stock clutch, stock cooling system, and ATF.
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Re: EFM Autoclutch

Post by jjavaman » 09:00 pm Oct 28 2018

doakley wrote:
John_S wrote:I don't have auto clutch experience but both my KDX and ATC were getting hot and new radiator caps fixed them.
So how did new radiator caps fix the problem? Bad thermostat?

The higher the pressure the more it raises the boiling point.
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Re: EFM Autoclutch

Post by doakley » 01:12 pm Oct 29 2018

Soooo...should I get a rad cap with a higher pressure rating? Current is a 1.1. And If I do, what pressure and what’s the downside risk of higher pressure if any?

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Re: EFM Autoclutch

Post by KDXGarage » 01:22 pm Oct 29 2018

If the clutch maker says you are riding in too high a gear, what did you tell him?

Can you just try to ride in a lower gear and see how it goes? Outdoor temps will be a few degrees lower compared to your last ride.

Do you have the radiator catch tank?

What coolant brand and mixture are you running?

A new or higher pressure cap may help. Also, look up Water Wetter, Evans, Engine Ice, etc.
Thank you Julien D for all your hard work!

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Re: EFM Autoclutch

Post by doakley » 06:26 pm Oct 29 2018

Good questions, Jason. Gary @ EFM only said that after we had talked about how I ride. I do tend to ride in a taller gear at lower rpms. I ride much smoother then and overall faster with better bike control. It does mean that I am sometimes/often in too tall of a gear coming out of a corner or in tight trees for example. With the manual clutch I would typically blip the clutch a bit to raise the revs. With the autoclutch I've been simply rolling on the throttle and the clutch would slip until the rpms built back up. I know that is hard on the autoclutch and that's what Gary felt was the most likely cause of overheating. I,be never had an overheating problem with the manual clutch but I have lost coolant in the past in especially tough (lots of slow,tight, woods sections). What I'm looking for are suggestions or experiences from others for things that might reduce the overheating tendency. Changing coolants might help too, good suggestion. (I currently run a 50/50 mix of off the shelf regular antifreeze and water.)

I'll try to change my riding style and not let the autoclutch slip as much obviously, but am just looking for any tips to help.

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Post by SS109 » 06:36 pm Oct 29 2018

I would do a coolant flush if it's been over a year since last done. Use the old vinegar trick then refill with a fresh 50/50 mix and a 1.6 radiator cap. That's as good as it gets IMO/IME without replacing expensive hard parts.
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Re: EFM Autoclutch

Post by KDXGarage » 09:20 pm Oct 29 2018

Yes, how old is the coolant?

Definitely take a look at the "high dollar fancy" coolants.

Also, do you have the stock catch tank?
Thank you Julien D for all your hard work!

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Post by SS109 » 10:05 pm Oct 29 2018

On the fancy coolants/additives, I'm not a fan.

All the "water wetter" types I have seen provide no protection against corrosion or from freezing temps as they work best when used only with pure distilled water and not antifreeze. Engine Ice types only give a false sense of your bike not overheating. Yes, you don't boil out coolant, however, that doesn't mean your engine isn't overheating and you don't know it is until the engine starts running poorly or worse.

Just my .02!
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Re: EFM Autoclutch

Post by doakley » 01:38 pm Oct 30 2018

Ok. I'll flush with vinegar, rinse that with water then fresh 50/50 std coolant before the race this weekend.
Jason, yes, stock overflow tank.

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Re: EFM Autoclutch

Post by KDXGarage » 02:38 pm Oct 30 2018

Be sure to use distilled water, never tap
Thank you Julien D for all your hard work!

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Re: EFM Autoclutch

Post by doakley » 07:18 pm Oct 31 2018

I did use distilled. I skipped the vinegar flush since the radiators and top end are all less than 2 yrs old.
Could not obtain a 1.6 cap before this weekend's enduro so put on a new 1.1 cap. Hopefully this helps.

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Re: EFM Autoclutch

Post by KDXGarage » 07:58 pm Oct 31 2018

Give em hell!
Thank you Julien D for all your hard work!

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Re: EFM Autoclutch

Post by doakley » 03:39 am Nov 01 2018

Enduro is in Maplesville,AL. Is that anywhere near you, Jason?

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Re: EFM Autoclutch

Post by KDXGarage » 10:21 am Nov 01 2018

It's a couple of hours or so away. I am up north. Maplesville is right in the center.

http://www.wbrc.com/weather/

It looks like rain today and zero percent chance on Saturday and Sunday. It should be great! 66 or 69 degrees!
Thank you Julien D for all your hard work!

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