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Old 04-18-2013, 01:51 AM   #4591
theGrinch
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Question

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Originally Posted by MKJ View Post
Has anyone done any head upgrades to their 525? I just did, and replace the top end. Strong, but popping and snorting. Jetting issues, possibly?
What upgrades did you do to the head?

.
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Old 04-18-2013, 09:53 AM   #4592
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What upgrades did you do to the head?

.
1mm over sized intake valves, relieved and polish chamber to unshroud valves.
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Old 04-18-2013, 09:54 AM   #4593
yondering
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Originally Posted by MKJ View Post
Has anyone done any head upgrades to their 525? I just did, and replace the top end. Strong, but popping and snorting. Jetting issues, possibly?
Did you do the head work yourself, and if so, did you make the mistake of polishing the intake tract? That can cause what you describe.
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Old 04-18-2013, 09:57 AM   #4594
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Woohoo, just took my 520 EXC out for a test ride after being down all winter. It now has a 540 12.5:1 kit and 8/33 cam. It's a noticeable improvement over stock; the power is still smooth with no hit, but it feels like the whole power band jumped up a gear. Before it would pull power wheelies in 4th easily, now it does the same in 5th.
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Old 04-18-2013, 04:57 PM   #4595
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Did you do the head work yourself, and if so, did you make the mistake of polishing the intake tract? That can cause what you describe.
No
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Old 04-19-2013, 09:30 AM   #4596
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Quote:
Originally Posted by yondering View Post
Woohoo, just took my 520 EXC out for a test ride after being down all winter. It now has a 540 12.5:1 kit and 8/33 cam. It's a noticeable improvement over stock; the power is still smooth with no hit, but it feels like the whole power band jumped up a gear. Before it would pull power wheelies in 4th easily, now it does the same in 5th.
Be kind to that motor, that was my favorite combo but I abused it and paid the price.
That 8/33 cam is all mid and top. On loose dirt/gravel you'll blow right to the limiter if you hold it, even in 6th.
Carry a can of octane booster. They didn't have super at that little gas station in the middle of nowhere or you just don't trust the gas? Dump it in the tank. If you run that 12.3:1 motor (12.5:1 but you unshrouded the valves) WOT on bad gas, this happens.



Combustion chamber ran too hot, valve seat came out, piston hit the valve...at 8000RPM...repeatedly.


As for the popping, lean out the fuel mixture. I think I went down one or two on the main. I know it sounds counterintuitive but the bigger piston creates a bigger vaccum signal so the stock jetting is too fat.

Enjoy it.



Sean
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Old 04-22-2013, 11:49 AM   #4597
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2 rfs and a dr650 do moab for the first time.
bump this thread up!

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Old 04-22-2013, 11:51 AM   #4598
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2 rfs and a dr650 do moab for the first time.
bump this thread up!
Nice video, shame about the hair
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Old 04-22-2013, 11:54 AM   #4599
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Nice video, shame about the hair
it was my mo-mo-mohawk.

and the term you're searching for is "majestic"
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Old 04-22-2013, 12:03 PM   #4600
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and the term you're searching for is "majestic"
The King of Vantucky
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Old 04-22-2013, 04:39 PM   #4601
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So... I'm pimping out a 07 KTM 525 XCW for ADV use. Should I start my own thread for that or just post it here?
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Old 04-23-2013, 08:28 AM   #4602
clapped_r6
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The King of Vantucky
more of a prince, really

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So... I'm pimping out a 07 KTM 525 XCW for ADV use. Should I start my own thread for that or just post it here?
lots of knowledge here!
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Old 04-23-2013, 10:23 AM   #4603
yondering
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So... I'm pimping out a 07 KTM 525 XCW for ADV use. Should I start my own thread for that or just post it here?
Post it here!
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Old 04-24-2013, 10:51 AM   #4604
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yes post it here
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Old 04-24-2013, 11:01 AM   #4605
Motorfiets
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any know a good operating temps for the 525? I just installed my trailtech and curious what temp range I should set...

( KTM 525 temperature range ) <---- for google one day
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