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  #1  
Old 1 Week Ago
temagogrod temagogrod is offline
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2017 YZ450F front master cylinder

Wondering if anyone has had a similar problem. I participated in the Transmoto 8 hour at Coffs on the weekend and blew the front master cylinder on a '17 model with 36hrs. Parked the bike up and shared the ride on a '15 model and did the same thing. The '15 has a few more hours, but we were nowhere near the pace and I'm not the hulk. I started to think bad batch, but hard to believe over that amount of time.

Have ordered an All Balls kit, braided line (for better feel) and higher spec brake fluid, but I don't believe this should happen. The irony is we finished the Transmoto on one bike, an '09 KTM EXC500.
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  #2  
Old 1 Week Ago
slideshowbob slideshowbob is offline
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What's the chance that they were topped up before the event, possibly overfilled ?
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Partial Quote Michaelf: ".. people who fully biased one way or the other are just missing out...".
A far more versatile statement than originally intended.
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  #3  
Old 1 Week Ago
Motoxfox Motoxfox is online now
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Bad luck and unfortunate outcome TGG .
What Michael says is one possibility.
Another is ingress of moisture into the system.
Which expands under excessive heat, maybe in this case
Also if you n the bike arent often in a race situation - higher speed, greater braking effort = higher temps than usually encountered.
As mych as it can be... apita...swapping out your fluids often and keeoing then on or a little below the max line is good insurance.

PS TGG how about a report on the event and the ride / race experience !
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Old 6 Days Ago
temagogrod temagogrod is offline
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Yeah, dealer asked that question, but I don't understand how an overfilled reservoir blows out the main pressure seal. Haven't pulled it down yet to see the exact failure either. My back-up WR is in pieces and Easter is too close. Don't the reservoirs have a bleed to cope with that anyway? Too answer your question though, no. Neither bike was topped before.
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  #5  
Old 6 Days Ago
temagogrod temagogrod is offline
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Quote:
Originally Posted by Motoxfox View Post
Bad luck and unfortunate outcome TGG .
What Michael says is one possibility.
Another is ingress of moisture into the system.
Which expands under excessive heat, maybe in this case
Also if you n the bike arent often in a race situation - higher speed, greater braking effort = higher temps than usually encountered.
As mych as it can be... apita...swapping out your fluids often and keeoing then on or a little below the max line is good insurance.

PS TGG how about a report on the event and the ride / race experience !
Again, I understand the notion of deterioration of the fluid. Have an MT10 where under tough conditions I experienced fade. Upgraded pads and better spec fluid has improved the condition sufficiently until I can afford the braided lines.

Agree entirely after the MT experience regarding change of fluid.
Will pull it down over the weekend and see what I find.
I think maybe one of those combination Chow Mein situations.

I will post in the ride report regarding the experience. I recommend the Transmoto events to everyone thinking of going. Transmoto were going to post a link with a lap by Fraser Higlett on their Facebook page.

Cheers for the input.
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