2004 crf450r switching to SS valves

price222
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price222
Ok, so I just bought this bike for $700 because the guy said it lost compression. After tearing the top end off, I saw that it dropped the right intake valve. So this is my question. Do I have to change my valve guides, seats, or anything like that if I switch to SS valves? Also what material are the stock valves made of? (titanium or SS?) Thanks in advance!!
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dirtywardog 1/18/2017 8:16am
1/18/2017 8:16am
sorry to say I wouldn't spend another penny on that 04....
price222
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price222 1/18/2017 8:25am
1/18/2017 8:25am
dirtywardog wrote:
sorry to say I wouldn't spend another penny on that 04....
Why is that?
Paw Paw 271
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Paw Paw 271 1/18/2017 8:40am
1/18/2017 8:40am Edited Date/Time 1/18/2017 8:43am
The best way to fix that head is to replace it with all new. If you go OEM it will be excessively priced.
I would suggest that you visit Thumper Big Bore web site and look at the APE head they offer. It is an all new casting with new seats, springs, valves , retainers, keepers and comes with a much better intake and exhaust flow ports.
I have one and it was installed about 4 years ago and it is still fresh and the performance is super. I have had nothing but good service out of it. The cost is about the same as it would cost to rework the old head and it is all new!
http://www.bigborethumpers.com/newheads.html

Paw Paw
Hallzilla
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Hallzilla 1/18/2017 8:42am
1/18/2017 8:42am
Paw Paw 271 wrote:
The best way to fix that head is to replace it with all new. If you go OEM it will be excessively priced. I would suggest...
The best way to fix that head is to replace it with all new. If you go OEM it will be excessively priced.
I would suggest that you visit Thumper Big Bore web site and look at the APE head they offer. It is an all new casting with new seats, springs, valves , retainers, keepers and comes with a much better intake and exhaust flow ports.
I have one and it was installed about 4 years ago and it is still fresh and the performance is super. I have had nothing but good service out of it. The cost is about the same as it would cost to rework the old head and it is all new!
http://www.bigborethumpers.com/newheads.html

Paw Paw
You forgot to drop the mic.

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Hallzilla
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Hallzilla 1/18/2017 9:00am
1/18/2017 9:00am
dirtywardog wrote:
sorry to say I wouldn't spend another penny on that 04....
price222 wrote:
Why is that?
Yes do tell
Cygnus
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Cygnus 1/18/2017 10:25am
1/18/2017 10:25am Edited Date/Time 1/18/2017 10:26am
Part it out. Then find one that is running. Unless you are doing this to learn mechanics. It won't be worth what you have in it by the time it's done.
byke
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byke 1/18/2017 10:38am
1/18/2017 10:38am Edited Date/Time 1/18/2017 10:39am
Do you have to? No, but you should do stem seals anytime you're in there because they're cheap. Regarding the guides, if the bike looks like it has a ton of hours, you should do those too. They're also cheap and any local engine shop can install those for you, which should also be cheap.

Stock exhaust are steel and stock intake are ti. Use magnets to confirm.

As for cutting the seats, it depends, but most of the time they're in bad shape by the time you drop a valve. If they look great, for reference, my head had 90hrs on replacement bronze seats when the oem ti intakes started walking, but they looked great and I replaced the valves with stainless and did not recut the seats and they sealed perfectly. If they look bad and you want to keep it on the cheap, you can have a local engine shop recut them, but maybe bring them the manual, or printout, with the seat info.

Katoomey
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Katoomey 1/18/2017 10:41am
1/18/2017 10:41am
is there not a better sub-forum to discuss old clapped-out ditbikes?
tprice07
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tprice07 1/18/2017 10:48am
1/18/2017 10:48am
Cygnus wrote:
Part it out. Then find one that is running. Unless you are doing this to learn mechanics. It won't be worth what you have in it...
Part it out. Then find one that is running. Unless you are doing this to learn mechanics. It won't be worth what you have in it by the time it's done.
This exactly...swing arm, frame, forks and rear shock should get him close to $700, then start on seat, tank, rims and cases should gain a bit more.
price222
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price222 1/18/2017 11:49am
1/18/2017 11:49am
Katoomey wrote:
is there not a better sub-forum to discuss old clapped-out ditbikes?
Isn't there somewhere else you can complain about nothing and spell 3rd grade level words incorrectly?
swedishfishmx 1/18/2017 12:10pm
1/18/2017 12:10pm
It's usually in the dumbgeon, but alas here we are.

Paw Paw answered, and that's the best advice you are going to get.

In the future though, put your tech questions in the correct spot. There is a reason we have a Tech sub-forum.
8686
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8686 1/18/2017 12:11pm
1/18/2017 12:11pm
Katoomey wrote:
is there not a better sub-forum to discuss old clapped-out ditbikes?
You, sir, are a piece of garbage.
Paw Paw 271
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Paw Paw 271 1/18/2017 5:23pm
1/18/2017 5:23pm
If all else is good on this bike , then the cost of the new head and add to the cost of the bike only equals about $1200 and that is not bad for a bike that deliver a lot of fun. They are easy to work on and the parts are available at good prices, so if all else is good, go for it.

Paw Paw
ML512
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ML512 1/18/2017 5:28pm
1/18/2017 5:28pm
Katoomey wrote:
is there not a better sub-forum to discuss old clapped-out ditbikes?
price222 wrote:
Isn't there somewhere else you can complain about nothing and spell 3rd grade level words incorrectly?
Actually, we do have a sub-section for Tech Help. This topic will be moved there, now.

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