SuzukiSavage.com - Do I need new valves?

kojones Full Member Offline SuzukiSavage.com Rocks! Posts: 223 Finland	Do I need new valves? 11/24/16 at 04:03:47 Long story short, removed my valves yesterday for check and found these marks on intake valves. https://www.dropbox.com/s/x7h295i9a1jocrc/2016-11-23%2021.21.13.jpg?dl=0 https://www.dropbox.com/s/m1gaglxqrld8lz8/2016-11-23%2021.20.12.jpg?dl=0 Slight marks on exhaust valves too, but I have to check if they're bent or not.
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Ruttly Serious Thumper Offline Thumpers Rule Posts: 5112 Manteca , CA Gender:	Re: Do I need new valves? Reply #1 - 11/24/16 at 07:19:52 Marks look like they are too far up the stem to affect guide or seals That maybe from when they were installed,marks made by spring keeper Just smooth them off so you don't cut the new seals,but I'm super picky I would change them all It's your choice,if you reuse them by sure to lap the valves!
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Mr.T Junior Member Offline SuzukiSavage.com Rocks! Posts: 55 Tega Cay, SC Gender:	Re: Do I need new valves? Reply #2 - 11/24/16 at 08:43:30 Short answer: No. As mentioned, lap, assemble and ride while you can. Winter is coming.
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Ruttly Serious Thumper Offline Thumpers Rule Posts: 5112 Manteca , CA Gender:	Re: Do I need new valves? Reply #3 - 11/24/16 at 10:04:03 Shorter answer:don't forget new stem seals,assemble,ride
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kojones Full Member Offline SuzukiSavage.com Rocks! Posts: 223 Finland	Re: Do I need new valves? Reply #4 - 11/26/16 at 02:14:07 Thanks everyone. The winter is already here, no rush to ride before April. Have to get those valves measured and hope that there's one bent that could be the issue of the intermittent knocking on the engine. If not, I have to split the case.
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Re: Do I need new valves?
Reply #5 - 11/26/16 at 03:33:52

Valves tick....they are too small and light to make much of a knock, and if they are sticking the performance usually suffers badly.

Before you split the case too look for a knock - check the flywheel nut. Two members on the forum have had loose flywheel nuts and it allows the crank/flywheel to make a sound that starts out as a tick - but develops into a loud knock as the nut gets looser. The knock is loudest at idle and the sound lessens as the rpm increases. My bike was one of the bikes with the loose nut, and it started ticking at 400 miles and was horribly loud by 1,000 miles.

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Armen Serious Thumper Offline Half-Witted Wrench-Jockey from Jersey Posts: 1452	Re: Do I need new valves? Reply #6 - 11/26/16 at 07:14:31 How many miles on the bike? Have to wonder how that notch got there.
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Re: Do I need new valves?
Reply #7 - 11/26/16 at 07:17:56

Not sure why'd you split the cases to look for a knock. Pop the left engine cover off and try moving the alternator up and down, then in and out. Main bearings will let you know they aren't happy. Remove the right side and look for the usual cam chain stuff, and try the same wiggling on the right side of the crank.
If you are still at a loss, you can pull the top end, hold the crank steady and try moving the rod up and down.
Look for something loose somewhere.
If you are lucky, Dave is correct Wink

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kojones Full Member Offline SuzukiSavage.com Rocks! Posts: 223 Finland	Re: Do I need new valves? Reply #8 - 12/14/16 at 05:22:57 One intake valve is visibly bent, easily checked with a drill. Others seem fine. Replacing that should get rid of the knocking, have to check if I have to replace the valve guide, too.
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Gary_in_NJ Serious Thumper Offline LS650 Cafe Racer Posts: 2633 Amongst the Twisty Roads	Re: Do I need new valves? Reply #9 - 12/14/16 at 05:28:14 If I had the head off of my bike, I'd be hard pressed not to remove the exhaust bridge, polish the ports, and make sure the seats are angled properly.
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kojones Full Member Offline SuzukiSavage.com Rocks! Posts: 223 Finland	Re: Do I need new valves? Reply #10 - 12/14/16 at 06:37:38 Gary_in_NJ wrote on 12/14/16 at 05:28:14: If I had the head off of my bike, I'd be hard pressed not to remove the exhaust bridge, polish the ports, and make sure the seats are angled properly. And that's exactly what I'm going to do
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Do I need new valves? Reply #11 - 12/14/16 at 06:59:35 Howcum the valve got bent is a question I'd be scratching my head over.
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Re: Do I need new valves?
Reply #12 - 12/14/16 at 08:25:57

justin_o_guy2 wrote on 12/14/16 at 06:59:35:

Howcum the valve got bent is a question I'd be scratching my head over.

AFAIK the cam chain tensioner has failed at some point, PO replaced the chain but obviously didn't remove the valves to see if they're bent or not. Piston had valve marks on top of it, already replaced the piston as it was wayy under wear limits.

So, all modifications include a Wiseco 95mm piston, DR cam shaft, the ring removed from exhaust port and a Dyna muffler with a 1,5 inch header if I can get one. I'm also considering to purchase a Mikuni VM36 Cool

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Gary_in_NJ Serious Thumper Offline LS650 Cafe Racer Posts: 2633 Amongst the Twisty Roads	Re: Do I need new valves? Reply #13 - 12/14/16 at 09:46:05 kojones wrote on 12/14/16 at 08:25:57: So, all modifications include a Wiseco 95mm piston, DR cam shaft, the ring removed from exhaust port and a Dyna muffler with a 1,5 inch header if I can get one. I'm also considering to purchase a Mikuni VM36 Sounds like a runner to me.
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Re: Do I need new valves?
Reply #14 - 12/15/16 at 21:24:28

kojones wrote on 12/14/16 at 05:22:57:

One intake valve is visibly bent, easily checked with a drill. Others seem fine.

Replacing that should get rid of the knocking, have to check if I have to replace the valve guide, too.

guides are cheap and replacing them is pretty cheap also, and considering you have at least one bent valve I would replace all of them just as a matter of good course...take no chances. I would also consider replacing all of the valves if you have any question at all about their condition.

The DR cam shaft has a lot of lift and a decent amount of added duration so you should see a substantial improvement in performance. Your exhaust ports will be the limiting factor.
MAC is now producing a header with a 1.75" ID and it is a little large for my taste but with the cam you have it may work pretty well. I think the cost on it is just over $200 which is not bad. You might consider that, unless you are building one yourself.

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