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June 30th, 2017, 12:00 AM   #1
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FX450 head removal

G'day guys,

Can the head be removed from the 450 70* bikes with the engine still in the frame?

I have a head gasket to replace.

Is the any issue with cam timing with enough head surfacing to bump up the compression a little?

I have a track day in two weeks. Normally if I had the time I'd do a full piston kit etc.

Thanks guys.
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July 2nd, 2017, 12:12 AM   #2
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I Ride: when I can which isn't often enough. FX450, FE570
Head removed.

At this stage I'll just replace the head gasket and get the head surfaced.

Summer I'll get a bit more serious.

Does anyone know if the 570 piston has the same deck height as the 450? Is there enough meat in the cyl to take the 450 out to 100mm?

Thanks.

Al.
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July 2nd, 2017, 05:14 PM   #3
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I Ride: when I can which isn't often enough. FX450, FE570
I'm going the top end kit.

The barrel is having 8 thou removed from the base for a compression ratio of 13:1.

It needs a hone for the new piston kit with no cross hatching evident.

I'll purchase a 570 camshaft when I can find one.
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July 2nd, 2017, 05:50 PM   #4
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I Ride: 7 Husabergs two FE570S,FS570 FE390/450,07 FE650,05 FE550,2 Husqvarna's 86 WR400,87 510,09 Buell
Stroke on 570 is 70mm and on 450 is 63.5mm
Thanks from Alan
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July 2nd, 2017, 07:24 PM   #5
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I'm quite sure there is enough material for a 570 piston in your 450 cyl. There are big bore kits for KTM 450 with a 102mm piston too. I'm planning to buy one for my fucked 570 cyl making it a 590.

As far as I know the only differences are diameter. Many KTM parts from the same year are interchangable so you have a few options.

With a 570 piston you will end up at 500cc and with a 102 you will get 520cc.
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July 3rd, 2017, 01:13 AM   #6
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Originally Posted by Rainerio View Post
Stroke on 570 is 70mm and on 450 is 63.5mm
Yeah thanks mate. its the deck height that was my main inquiry, whether the pin to deck was different.
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July 3rd, 2017, 01:26 AM   #7
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Originally Posted by jon andersson View Post
I'm quite sure there is enough material for a 570 piston in your 450 cyl. There are big bore kits for KTM 450 with a 102mm piston too. I'm planning to buy one for my fucked 570 cyl making it a 590.

As far as I know the only differences are diameter. Many KTM parts from the same year are interchangable so you have a few options.

With a 570 piston you will end up at 500cc and with a 102 you will get 520cc.
Thanks Jon for the reply.

At this stage I'm going to stick with the 450cc. The cyl measured good for a hone and a 'C' piston. 8 thou is being removed from the bottom of the barrel to give 13:1 with a stock piston.

I'll pull the head down for a clean up of the ports.

All while I wait for a piston to be found. I'm wanting a Wossner over the likes of a ProX. If one can't be located I'll have to go with the Vertex at an extra $60 FFS.

Jon, my reading found the 102mm kit improved some low end but did nothing much beyond that which doesn't work for my motard track work. Keep us informed on your progress with the 570. I'd like some more mid and high for my 570.

Al.
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July 3rd, 2017, 02:20 AM   #8
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I would guess to get more mid and hi for a 570 one would need to straighten the exhaust and give it a bigger throttlebody. This assumption is just from reading about other peoples experience, I have no empirical data myself. But it makes sense.

The cylinder I have can't be honed so that's why I will go for 102mm, + I want more grunt while driving around for fun as I don't race. I do however plan to ice race in the winter so it's not optimal, but neither am I so it is what it is
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July 3rd, 2017, 05:34 PM   #9
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I Ride: when I can which isn't often enough. FX450, FE570
This will be the last oversize in this bore. If there is a next time i will go the 102mm, or.....

As far as the Wossner pistons go, the 570 has a higher compression height by 1.7mm over the 450. That could be dealt with.

So in essence you could use a 570 piston and have the cyl bored to 100mm and use the 570 head gasket. (as you indicated above) Would be alot cheaper option than the 102 kit.

For the camshaft in the 450 I have located a cam 78036010233. From research it looks to be the first update of the 570/530EXC cam.

Last edited by Alan; July 3rd, 2017 at 05:51 PM.
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July 4th, 2017, 03:13 PM   #10
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I Ride: when I can which isn't often enough. FX450, FE570
I have another cam I am purchasing. It's the first 570 cam. 81736010133

The first cam I have on the way being the 78036010233 is apparently an early 530EXC-R cam.

Some of these were known to give starting issues with a faulty decomp. I noticed that some have the decomp mechanism reversed. I may be able to correct this with the mechanism off the 450 if I decide to use this cam.

I don't know what the specs are of this cam or how different it may be to the 570 cam.
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