SuzukiSavage.com - hiss exhaust valves

wambr

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hiss exhaust valves
04/25/13 at 11:43:02

the situation is this: when travelling began to feel that the dynamics of the bike became less.. unscrewed the cylinder head, took valves examine them saw that there were no signs onto the saddle that is the cause . I decided to lapped valves to their saddles . and here's the result: to check the tightness of the valve poured kerosene in the socket, waited as recommends that instructions about 5 minutes.... traces of course of no everything seems to be OK, but when installed the cylinder head in place and decided to turn the crankshaft with valves closed heard the hiss in the exhaust tract . prompt please, dear experts-is that OK? or maybe it's worth once again lapped valves to their saddles?

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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18101 Camp Springs, Kentucky Gender:	Re: hiss exhaust valves Reply #1 - 04/25/13 at 11:59:09 Only thing I think could could cause this is the valve clearance with the rockers is too tight - or the decompression lever is holding the valves open a bit.
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wambr Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 610 Russia, Samara Gender:	Re: hiss exhaust valves Reply #2 - 04/25/13 at 12:08:29 probably not all said ... cylinder head cover with musicians valve is not installed .
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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18101 Camp Springs, Kentucky Gender:	Re: hiss exhaust valves Reply #3 - 04/25/13 at 12:14:20 If the valve is not seating without the rockers and cam installed....then either the valve face and seat are not round and true - or the valve stem is sticking on something and not letting the spring pressure pull the valve down on the seat. Do you have a machine shop or mechanic with the tools to grind the valves and seats?
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wambr

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Re: hiss exhaust valves
Reply #4 - 04/25/13 at 12:23:34

so this is not very good?sorry... Sad

I'll try to apply in the mechanical workshop...in one of them works my friend . as something not quite usually happens: like a bevel on the valve in the norm, and the trace on the valve seat, too, there's no fuel leaks, but the valve a little hissing... thank you Dave for a speedy and good answer . I will continue to repair.

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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18101 Camp Springs, Kentucky Gender:	Re: hiss exhaust valves Reply #5 - 04/25/13 at 12:51:22 The only other thing I can suggest is to get some "bluing", It is a die that you can apply to the valve face, and then install the valve and see if the bluing transfers over to the valve seat. If there are gaps in the blue - it indicates a low spot.
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SALB Serious Thumper Offline FSO Posts: 668 Whittier, AK Gender:	Re: hiss exhaust valves Reply #6 - 04/25/13 at 13:13:46 This may seem silly, but is it possible the hiss you are hearing is the compression escaping as the exhaust opens and the piston pushes all the volume out? I'd be curious as to the results of a compression test.
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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18101 Camp Springs, Kentucky Gender:	Re: hiss exhaust valves Reply #7 - 04/25/13 at 13:26:38 SALB wrote on 04/25/13 at 13:13:46: This may seem silly, but is it possible the hiss you are hearing is the compression escaping as the exhaust opens and the piston pushes all the volume out? I'd be curious as to the results of a compression test. From what I read.....the cam and lifters are not installed.
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SALB

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Re: hiss exhaust valves
Reply #8 - 04/25/13 at 14:02:21

Dave wrote on 04/25/13 at 13:26:38:

SALB wrote on 04/25/13 at 13:13:46:

This may seem silly, but is it possible the hiss you are hearing is the compression escaping as the exhaust opens and the piston pushes all the volume out? I'd be curious as to the results of a compression test. Undecided

From what I read.....the cam and lifters are not installed.

What I understood was the hiss was what caused him to pull it apart? Undecided

So yes, that would have to be done after reassembly.

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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28889 L.A. California Gender:	Re: hiss exhaust valves Reply #9 - 04/25/13 at 14:16:23 could the hissing be from the piston instead? Squirt some oil in there.
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Oldfeller--FSO Serious Thumper ModSquad Offline Hobby is now "concentrated neuropany" Posts: 12673 Fayetteville, NC Gender:	Re: hiss exhaust valves Reply #10 - 04/25/13 at 18:26:03 +1 on air leaking past the ring gaps -- it has to go around and back twice but it would hiss doing it. Some heavy oil would shut down the ring leakage completely and remove its ability to hiss.
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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18101 Camp Springs, Kentucky Gender:	Re: hiss exhaust valves Reply #11 - 04/25/13 at 18:29:23 The weird part, and we will have to wait until the sun comes up on his side of the planent......it why did Wambr take the engine apart. Sometimes the language barrier makes it tough. (Still kind of chuckling about the musicians valve not being installed).
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Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 28674 Tucson Az Gender:	Re: hiss exhaust valves Reply #12 - 04/25/13 at 18:34:28 Dave wrote on 04/25/13 at 18:29:23: (Still kind of chuckling about the musicians valve not being installed). Spit valve?... ...
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wambr Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 610 Russia, Samara Gender:	Re: hiss exhaust valves Reply #13 - 04/25/13 at 22:49:14 SALB wrote on 04/25/13 at 13:13:46: This may seem silly, but is it possible the hiss you are hearing is the compression escaping as the exhaust opens and the piston pushes all the volume out? I'd be curious as to the results of a compression test. check the compression in a home garage I have no an opportunity.
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wambr

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Re: hiss exhaust valves
Reply #14 - 04/25/13 at 23:00:30

Dave wrote on 04/25/13 at 18:29:23:

The weird part, and we will have to wait until the sun comes up on his side of the planent......it why did Wambr take the engine apart. Sometimes the language barrier makes it tough. (Still kind of chuckling about the musicians valve not being installed).

the sun was up on my side of the planet, and you are still not asleep?

the result of my doubts and your(thank you guys) conclusions and advice is this: a few minutes ago I talked with a friend of mine , working in a mechanical workshop and he comforted me. he said-this is acceptable, because after lapping valves to their saddles on the working surfaces remain microscopic roughness... they disappear after a few hours of engine operation.
in General, I decided to assemble the engine on and of course after some time will make the measurement of компрессии. once again very grateful to you for ideas. you guys are really cool!

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