F4 interesting radiator leak - MVAgusta.net
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post #1 of 14 (permalink) Old 01-19-2008, 10:56 PM Thread Starter
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Question F4 interesting radiator leak

Ok - so last saturday it was 50 degrees, decided to take the girl out for a january ride. Chilly, but great to be back on two wheels.

After about 2 hours of riding i get back to town and smell a whiff of that radiator fluid smell, dont think much of it (no such smell after the first hour). A bit later I notice a bit of steam rising from below. I get off and notice a bit of green MV lifeblood dripping on the pavement. So I high-tail it home ASAP and miraculously hit all green lights.

I get to the bikes "home" (not mine, I live in manhattan) and remove left faring, and it seems that one of the hoses is leaking. But that turns out NOT to be a hose, but rather, a teeny tiny "leak" (spritz) eminating from the upper radiator, as if a pin hole was made and coolant forced out under pressure. With bike running and flashlight, I confirmed this is in fact the cause of the leak (towards the top of the radiator). The lost coolant was maybe a cup, and the resevoir was still adequately filled (i.e., the bike was not out of coolant).

Does anyone have any thoughts on this (cause, etc.)? Should such a thing be covered under warranty (I am still within my 2 years - 2006 F4S purchased in January 07).

This is a bit distressing and I think I need at least a new upper radiator, I dont want to try any of those radiator "sealer" fluids.

Oh, during my investigation, I noticed that the pipes coming from engine block (visible without faring on) are visibly red hot in the dark. I assume this is normal (?).

I should add that if you recall some of my past posts, my bike runs hot, and I mean REALLY hot (moreso than the average F4 overheating stories). I wonder if i've had a bad radiator from the getgo?

Any any all commentary appreciate- you guys are all a lot more mechanically inclined than I am! Hope you all enjoyed your holidays.
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post #2 of 14 (permalink) Old 01-19-2008, 11:46 PM
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Definitely sounds like a warranty issue to me. Yours is not a case of normal wear and tear.
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post #3 of 14 (permalink) Old 01-20-2008, 05:18 AM
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unless its a stone hole?


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post #4 of 14 (permalink) Old 01-20-2008, 06:54 AM
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If it is not a hole from road debris, and you have done nothing to void the warranty, I would say it should be covered. If they do replace it, tell them you want the old one back. You can always sell it to some one like me.

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post #5 of 14 (permalink) Old 01-20-2008, 10:49 AM
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Yep, warranty issue, they changed mine no probs. Seems to be a big problem. I don't think the quality of the rads are that good!

'' Oggi Corriamo''
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post #6 of 14 (permalink) Old 01-20-2008, 11:17 AM
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i had the same problem wit mine actually. the tiniest hole - as u said a pin prick. i never bothered with a new rad just got this one repaired - it meant losing one cell of the rad so it runs about 8 deg hotter but otherwise its fine. dont suppose u want yours to run hotter though.

as for your exhausts glowing - that doesnt seem right. if they are that hot when you get off and look at them - the would be a good 50% hotter if your were thrashing it. cant be good.
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post #7 of 14 (permalink) Old 01-20-2008, 01:18 PM
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MV requires the 'bad' parts back for any warranty exchange.
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post #8 of 14 (permalink) Old 01-20-2008, 01:35 PM
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Crap. Bad news.
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post #9 of 14 (permalink) Old 01-20-2008, 02:37 PM
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My first post in months but that's another story and NO!, I wasn't banned!

There have been a few posts regarding split radiators, but I can't remember anyone posting a pic so here's mine - its taken from the rear left-hand side, as seated. The split is on the top water passage directly below the left hand side of the mounting bracket.

My original split in exactly the same place, but it had done a fair few tens of thousands of miles and was well out of warranty so I had to get this one out of my hard-earned. You can see that it was still virtually brand new when it cried "enough!", but it was the riding season so I managed to fix it with my favourite epoxy/carbon/kevlar concoction rather than faff around arguing/waiting for a warranty deal.

I agree with the comment in the other thread - there is just too much weight hanging off the two upper mounting brackets - you can see how the fins have been distorted by vibration and/or movement.

So, another "design fault" of our beloved Agustas which has been allowed to remain unresolved!
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post #10 of 14 (permalink) Old 01-20-2008, 02:58 PM
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extending the bracket horizontally along the top of the rad would spread the weight more evenly, especially if you went both ways and gusseted it


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