RE: Saito 150 valve adjustment and idle  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> RE: Saito 150 valve adjustment and idle
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RE: Saito 150 valve adjustment and idle - 5/1/2008 12:57:46 PM   
Hobbsy



Posts: 10690
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		Actually, at TDC on the exhaust stroke both valves wil be open for about 40 degrees, "overlap". That's another way to tell if you're correct.

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RE: Saito 150 valve adjustment and idle - 5/1/2008 1:05:28 PM   
Ken6PPC


 

Posts: 653
Joined: 6/20/2006
From: Hamilton, OH, USA
Status: offline
quote:

ORIGINAL: rainedave

This is confusing. Both my OS manual and Bill Robison stated to check the clearance at TDC of the compression stroke. Ken6PPC, now you are saying it should be checked at TDC between the exhaust valve closing and the intake valve opening. I just checked the clearance on an engine and the clearance it tighter at the TDC between the two valves' movements, but it's correct at TDC during the compression stroke. Can you explain why it's better to set it your way?

Many thanks,
David


Sorry for the confusion. You should check for VALVE LASH at TDC on the compression stroke. I check TIMING at TDC on the exhaust stroke.

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RE: Saito 150 valve adjustment and idle - 5/1/2008 10:26:38 PM   
elsabella


 

Posts: 33
Joined: 4/25/2004
From: myerstown, PA, USA
Status: offline 		Thank you that worked great, but just one more problem. She starts great and runs great but she will not run at idle when the glow starter is taken off. New plug and new fuel and low end neddle is set at factory setting and the high end at manual specs. Do you think its coming from the carb or somthing I miss on the vavles?

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RE: Saito 150 valve adjustment and idle - 5/1/2008 11:34:48 PM   
iglowhead


 

Posts: 111
Joined: 6/10/2004
From: Waxahachie, TX, USA
Status: offline 		Sounds like a glow plug issue to me.
The plug you are using may not be hot enough.
On 4 strokes I like using the OS Type F plug.
If it is not the plug you are probably going to have to adjust
the low speed needle. Never count on a "factory" setting.

(in reply to elsabella)
       Post #: 29

RE: Saito 150 valve adjustment and idle - 5/1/2008 11:38:13 PM   
Hobbsy



Posts: 10690
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		As was mentioned above the factory setting is way too rich, did you set the High Speed needle using a tachometer?

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RE: Saito 150 valve adjustment and idle - 5/2/2008 12:03:48 AM   
Hobbsy



Posts: 10690
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		Ken, your engine must be timed differently than mine, this is a 1991 high compression 1.50, I pic. #1 at TDC compression stroke of course both valves are closed, in pic. #2 at TDC on exhaust stroke both valves are about 1/4 open.

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"I have gone faster backwards, upside down and on fire than most people have gone at all" Don Garlits

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RE: Saito 150 valve adjustment and idle - 5/2/2008 12:23:00 AM   
elsabella


 

Posts: 33
Joined: 4/25/2004
From: myerstown, PA, USA
Status: offline 		Well all is well, It just needed the carb tuned, low and high end neddle. I will fly it tomorrow and pray all it work well. Thanks to all for the help. Great info!!!

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       Post #: 32

RE: Saito 150 valve adjustment and idle - 5/2/2008 1:18:06 AM   
rainedave



Posts: 5192
Joined: 7/21/2005
From: Greensboro, NC, USA
Status: online
quote:

ORIGINAL: Ken6PPC
Sorry for the confusion. You should check for VALVE LASH at TDC on the compression stroke. I check TIMING at TDC on the exhaust stroke.



My bad, Ken6PPC. You did say timing. I obviously didn't read your post carefully.

Thanks,
David

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       Post #: 33

RE: Saito 150 valve adjustment and idle - 5/2/2008 3:18:38 AM   
lou1947


 

Posts: 139
Joined: 5/9/2006
From: Quincy, IL, USA
Status: offline 		Glad to hear you got it running Wondering if the low end was rich?

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RE: Saito 150 valve adjustment and idle - 5/2/2008 3:25:46 AM   
Ken6PPC


 

Posts: 653
Joined: 6/20/2006
From: Hamilton, OH, USA
Status: offline
quote:

ORIGINAL: Hobbsy

Ken, your engine must be timed differently than mine, this is a 1991 high compression 1.50, I pic. #1 at TDC compression stroke of course both valves are closed, in pic. #2 at TDC on exhaust stroke both valves are about 1/4 open.


That is interesting, Hobbsy. I am pretty certain there was very little valve open overlap on that 1.80, if any at all. Of course, I really couldn't SEE the actual valves operating. I was just watching the lifters and rockers.

Tell you what. I have a Saito 150S that isn't on a plane right now. I'll take it apart when I get some time, and see how the valves act at TDC on the exhaust stroke. I'll report back here when I find out if they are both open and have overlap.

Knowing that Murphy is ALWAYS at work, and knowing that my luck is usually BAD, I check the action of the valves in the manner I described BEFORE I take it apart. Then I know how the valves should react after reassembly. Other than running the engine, that is about the only way I know to check timing. If the timing is off, I had rather find it BEFORE I put it all back together.

I haven't found one of my cams off yet, but it seems like it would be really easy to get it off one tooth, when reattaching the cam box.

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RE: Saito 150 valve adjustment and idle - 5/2/2008 3:28:26 AM   
Ken6PPC


 

Posts: 653
Joined: 6/20/2006
From: Hamilton, OH, USA
Status: offline
quote:

ORIGINAL: rainedave


quote:

ORIGINAL: Ken6PPC
Sorry for the confusion. You should check for VALVE LASH at TDC on the compression stroke. I check TIMING at TDC on the exhaust stroke.



My bad, Ken6PPC. You did say timing. I obviously didn't read your post carefully.

Thanks,
David


No harm done, David. Perhaps someone else misunderstood that, and your questioning it helped save them some grief!


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AMA #853194

(in reply to rainedave)
       Post #: 36

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