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Exhausts Exhausts - Headers, Mid Pipes, Mufflers


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October 28th, 2015, 11:55 PM   #1
390
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390 overheating

One way to reduce overheating on the 390 is to free up the exhaust.. does anyone know how to do this or have pics? I get told its easy but I can't work it out.
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October 29th, 2015, 03:28 AM   #2
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I Ride: 2012 FE 570, 2004 950 Adventure, 99 YZF 400, 1982 FXR Harley Davidson
I'm not sure if it'll help mate but I just put a Barrett Exhaust on my 570 and it flows like the Nile.....very good exhaust, not big money Aussie made product and no ECU flash required.......if it's restrictive exhaust gas that's causing your problem then the Barrett will fix it....aside from that put a fan kit on it, I did that as well but it's yet to get hot enough to turn it on since fitted...but some single trail will fix that
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October 29th, 2015, 04:51 AM   #3
390
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Yeah I have fan. But still gets hot on big hillclimbs and boils the petrol. It's quite common on this model apreantly. I have also put in liquid intelligence coolant to assist. There is a petrol tank cover to help st of the petrol boiling. But it seems like a big job taking off the tank
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October 30th, 2015, 03:47 PM   #4
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I Ride: 2012 FE 570, 2004 950 Adventure, 99 YZF 400, 1982 FXR Harley Davidson
Agreed, tank removal is painful compared to my FE 550 which took about 30 seconds. While I didn't have the fuel boiling issue stick it's head up, I jumped on to it early. Removed the tanks and used exhaust wrap to cover the mid pipe from where the muffler connects right up to where it goes under the frame. I looked at a few options and decided to do it while the mid pipe was still on the bike....painful, but not that big a deal....at the same time I got some heat reflective foil insulation and cover the area under the tank that was closest to the mid pipe.

When done it was clear the wrap worked very well, even at operating temp I can grab the mid pipe and hold it for as long as I want without melting of flesh, combined with the tape I'd say it'll have reduced heat transfer to the tank / fuel dramatically, pm me if you want some pics.

As far as hill climbs and boiling I think it'll happen regardless, lots of heat revs and stress and little air flow through the radiators, surprised it boils though with LI fluid in it, I use it in my 950, it's very good product, I'll be setting up my 550 with the same next service.

May a way to assist would be to wire up an over ride switch for your fan, when you get to the snotty stuff turn it on and let it run and when you get clear flick it off....not sure but figure it can't hurt.
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November 1st, 2015, 01:02 AM   #5
390
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Cheers for that 520 pilot..I've spoken to a guy that lives near by, he stated he had freed up the exhaust and hasn't had to put exhaust wrap or reflective fear on tank. So all trial and error I reckon.
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November 1st, 2015, 01:07 AM   #6
390
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Out a matter of interest 520 pilot, what is the highest temperatures yours gets to.. I've had my around 101degrees Celsius
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December 14th, 2015, 10:13 AM   #7
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Hi there,

I had this problem with my Husa FE390 but I decided to invest some money on it and here is what I did:

FMF powercore4 exhaust system with Mega bomb
CV4 3.0 cap
CV4 silicone hoses (with this upgrade you must remove the thermostat which cools down the bike better)

With this upgrades perform better, runs smooth and its cooler!

I hope this info helps
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