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Old 03-28-2004, 11:49 AM
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Default 4-stroke outboards, valve adjustments?

do the 4 stroke outboards require valve adjustments?
if so how often and what would it cost to have a certified mechanic do it?
thanks.
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Old 03-28-2004, 11:57 AM
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Default RE: 4-stroke outboards, valve adjustments?

i think it's myth...
three years of heavy use and my F100 never needed it
never had to "re-torque the bolts" either...

maybe after hundreds and hundreds of hours you'd need adjustment, but by then think of all the 2-stroke oil you've saved!
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Old 03-28-2004, 12:12 PM
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Default RE: 4-stroke outboards, valve adjustments?

thanks cgrand
thinking about swaping in the 150 2 stroke for the new F150 yamaha
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Old 03-28-2004, 12:59 PM
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Default RE: 4-stroke outboards, valve adjustments?

There's been a lot of talk about the cost of a valve adjustment and a lot of misinformation posted, but I have yet to see a post saying "I needed an adjustment at ---- hours and it cost ---- dollars". Anyone,Anyone. There is a requirement to check the clearance, but if we can't see that an adjustment is needed maybe we can take it upon ourselves to extend the interval.
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Old 03-28-2004, 01:22 PM
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Default RE: 4-stroke outboards, valve adjustments?

I have talked to 3 mechanics with 12 or 13 "Checks" under there belts, no adjustment needed. I doubt any "Knows" how much an adjustment will cost because I've never heard of one being done. Yamaha has looked into extending the "Check" interval, starting with the F150, 500hrs vs 400hrs for the others. I have found lately a guy with "Thousands" of hours on a F225 (He didn't know exact numbers) and he never required an "adjustment" he did require a new powerhead though The F150 has broken all of the stigmas surrounding the 4 strokes, and the 2 stroke guys are hanging onto the Valve adjustment, like the captain of the Titanic held onto the wheel. The f225's still have some power to weight problems to work on, but the Suzukison's have about solved that problem.
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Old 03-28-2004, 02:24 PM
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Default RE: 4-stroke outboards, valve adjustments?

I think the valve lash, camshaft lobe to shim check on my suzuki for example is probably a good idea. The manual indicates a check at the 20 hr service. And inspection every 200hrs. I would think that there may be a few ouboard mechanics that may try and charge for the shim replacement whether they do it or not. It does take a lot more time to remove and select the proper shim, as special tools are required for this. I too have heard that shim replacement has been rare on motors with 500 hrs or less.
I would have to believe that the valve train will get a bit noisey when the shims need to be replaced. Anybody have any comments on this?

Thanks

Don
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Old 03-28-2004, 03:36 PM
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Default RE: 4-stroke outboards, valve adjustments?

I check the valve clearance on my yamaha every time I use it. But then again I am running it at 13,500 rpm's most of the time. 2004 Yamaha YZ250F.


Doing the check is very simple, but time consuming. So you will be paying for the time.
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Old 03-28-2004, 04:36 PM
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Default RE: 4-stroke outboards, valve adjustments?

It's funny you mention noise. I was told off the record by a Yamaha rep, that you can tell easily by noise before they actually need adjustment. He also said you need over 1000hours before you even need to think about it. Now this is for a normal recreational boater, not the SKA flyboys
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Old 03-28-2004, 05:07 PM
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Default RE: 4-stroke outboards, valve adjustments?

Quote:
Sea_Dad - 2004-03-28 2:36 PM

2004 Yamaha YZ250F.

Are you a member of DRN?

What's your screen name over there?
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Old 03-28-2004, 05:38 PM
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Default RE: 4-stroke outboards, valve adjustments?

The owners manual say "yes", but I can't quote at what frequency. (hours of operation) On a 4 valve 4 cylinder, figure at least 2 hours at about $75/hour. Probably double for a V6.

With the now common "bucket and shim" adjustment, I would like to hear from some "Pros" just how many valves requires changing shims. My bet is that +90% of the valves checked require no adjustment.
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Old 03-28-2004, 07:11 PM
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Default RE: 4-stroke outboards, valve adjustments?

Valve adjustments are required a lot of todays 4strokes. On my Honda 9.9 it is required quite frequently at first. I cost me about 200bucks. That would pay for a LOT of 2 cycle oil for a similar size motor. And, I think that a 2 stroke makes more power. For all the hype--4stroke this 4 stroke that--I think that I should have purchased a 15-20hp 2 stroke. Same weigt and double the power. Oh well, at least I get to T off the main gasline to power the kicker.

Both designs have their advantages, my favorite aspect of a 4 stroke is the lack of stinkey fumes.
My favorite aspect of a 2 stroke is POWER!
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Old 03-28-2004, 10:12 PM
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Default RE: 4-stroke outboards, valve adjustments?

Quote:
SEASWIRL PAUL - 2004-03-28 6:11 PM

Valve adjustments are required a lot of todays 4strokes. On my Honda 9.9 it is required quite frequently at first. I cost me about 200bucks. That would pay for a LOT of 2 cycle oil for a similar size motor. And, I think that a 2 stroke makes more power. For all the hype--4stroke this 4 stroke that--I think that I should have purchased a 15-20hp 2 stroke. Same weigt and double the power. Oh well, at least I get to T off the main gasline to power the kicker.

Both designs have their advantages, my favorite aspect of a 4 stroke is the lack of stinkey fumes.
My favorite aspect of a 2 stroke is POWER!
I hope for that price you got valve check/adjust, new plugs, oil change, timing check, and gear oil change. Thats a lot of money to have the valves checked/adjusted on a 2 cylinder motor. I would hate to see the bill for a V6.

Just my .02

Don
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