[Trapset]

I posted this in the vintage sled forum but not sure if the ol girl qualifies as vintage so thought I’d ask here too.
Has anyone installed the optional cooling kit on an 89/90 Enticer 400? I found one on
eBay but can’t find installation instructions.

 

[kccats]

That is still a fanner right
Never heard of a cooling kit

 

[Trapset]

Yeah, it’s a fan. They went to the 400 for two years, 89-90, with the same body style as the 340 Enticer long tracks. I have two 340 long tracks as well and all parts interchange. I think they were using up old 340 inventory and new 410 parts before the full on introduction of the Enticer 2 410. The 410 is actually the same 408cc jugs as the old 400. They also share the same crank case.
The problem was the 400 got hot easy and was prone to burning pistons. The cooling kit was introduced to help the problem but I can’t find instructions. It has a hose and barbs to drill and fit into intake as well as an extra vent to install on hood but no routing.

 

[Trapset]

 

[kccats]

1990 Yamaha ENTICER LTR (ET400TRP) Cooling Kit (Optional Part) | Babbitts Online

Shop online for OEM Cooling Kit (Optional Part) parts that fit your 1990 Yamaha ENTICER LTR (ET400TRP), search all our OEM Parts or call at (231)737-4542

www.babbittsonline.com

They show #7 as a Nozzel and that it goes Into the intake!
Could this just be like a Boost bottle but just passes air to in front of new air duct?
I think a bit more work but easier would be to add air intakes from hood directing it straight down on Carb / intake!
Then remove the shrouds and clean all the fins

 

[Trapset]

That’s what it does for sure. I have an extra intake with barbs installed already. Just not sure where the rest of the hit goes/hooks to.
I have over heated this motor 3 times, always on real long runs in Canada. Last rebuild I enlarged the vent on the hoods where the fan is in order to force more air. I’m also a stickler for keeping the fins clean on this sled. The 340s, not so much, they seem near impossible to kill! Lol

 

[Yamaha440]

You could try increasing main jet size a step or two, even if it's jetted to the book. The downside is that it'll make less power, but less power=less heat, and extra fuel will directly cool the engine as it evaporates as well

 

[Trapset]

Good advice! That’s what I did last time I rebuilt the motor, went from the recommended 140 main to a 142. Plugs look more black then brown now but way better than how hot they used to look.
I think I have the cooling issue solved with the bigger jet and opened up hood but would still like to install the cooling kit since I have it.

 

[kccats]

Can you get like a dryer flex hose from vent to back side intake

On my race sled I reworked the hood and headlight into a cowl induction

 

[Trapset]

I could do that but I already have the cooling kit.
I can’t for the life of me figure out how this is installed. The hose fits snug on both the white and black tees. The hose is too large for the brass barbs from intake and too small for the straight piece of barbed tube. The white Tee has a brass reducer in only

the post that appears to be jet like. I would have thought that Yamaha would have had a bulletin posted at some point but I sure can’t find one.

 

[kccats]

I wish YamaDad were here

 

[Trapset]

Yup, if he didn’t already know, he’d sure know where to find out.

 

[kccats]

I just do not see how plastic hose and Ts
could cool a fanner?

 

[Trapset]

I just assume its trying to add a small amount of cooler air into intake via the barbs on bottom of the intake??? I wouldn’t think it’s supposed to tap into oil or fuel lines.

 

[kccats]

A Tap into the intake would cause a lean condition!

 

[Trapset]

They show it tapped into both intakes but the hose is closed every where when attached so I believe their thinking is to have the pulse pump air through the hose where it is cooled by the additional hood vent that’s included is n the kit, then back through intake. I guess, who knows. Would love to solve this mystery even if I don’t install the kit.

 

[kccats]

I have a SRV and the hood has been scorched
So the even Bigger fanner might need it too!