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TOPIC: Re:Firing on one cylinder
#1020672
Paladin (User)
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Gender: Male cwayneb.com Location: Lexington, KY Birthdate: 1954-10-09
Re:Firing on one cylinder 6 Months ago  
Ctkog wrote:
The HT-2011 lifters is what many use when replacing the yamaha lifters.

I wouldn't think about using that same cam unless you have a way to verify the entire lobe profile is still good.

And the odds of that are pretty slim.



Thanks, I'll try to go ahead and get one of those. Safe to assume I just replace the damaged lifter since the other one is ok? On another note, looks like I'm not going to be riding anytime in the near future. I just looked up prices on cams and don't have the funds for that. I work on straight commission and business has been bad this year. Just put on new tires and a new battery about a hundred miles prior to the lifter going out. So I'm just screwed for this year. Maybe by next Summer I can come up with the funds to fix it.
 
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Re:Firing on one cylinder 6 Months ago  
With the black oil deposits you found I'm thinking you also have a ring problem. If the 110 psi compression on the rear cylinder was with the decomp solenoid disconnected then it's way too low. Your problem probably started after the recall.

If some technician Thought that those smooth cylinders needed to be hogged out with a rough hone then the new moly rings probably didn't last too long. They require a cylinder hone with a minimum off 600 grit. Personally I wouldn't have touched them with the exception of making sure the carbon ring at the top was removed..

Also, during the recall it wasn't necessary to disassemble the right side of the engine. It is possible though that a technician removed the lifters not knowing how important it was that they go back in the same holes.

I don't think a cam and lifters is a long term fix. In your case I would want to pull the cylinders and find the reason for the blowby.

Whatever you do make sure you buy cam breakin lube and apply plenty of it to the new cam and lifters.
 
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My 99 Standard Test Mule
Scott B.
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#1020679
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Re:Firing on one cylinder 6 Months ago  
A good used running motor, can be had for about $800. Just a thought, if what Scott mentioned, is ringing any bells.
 
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#1020680
Paladin (User)
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Re:Firing on one cylinder 6 Months ago  
texasscott1 wrote:
With the black oil deposits you found I'm thinking you also have a ring problem. If the 110 psi compression on the rear cylinder was with the decomp solenoid disconnected then it's way too low. Your problem probably started after the recall.

Decomp solenoid was connected when I did the compression test. Also, apparently I should have had the throttle wide open when I checked compression and I didn't know that. So who knows what the actual compression is.
 
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Re:Firing on one cylinder 6 Months ago  
That might be a better solution for sure. Not sure where I'd find one but with the cams costing nearly $500 and then the potential for ring problems, etc. It might be cheaper to replace the motor. Thanks for the thought. Apparently did the compression test wrong - first time I've ever done one and I didn't know what to do other than stick the tester in the spark plug hole and run the starter until the pressure maxxed out. Also didn't have an adapter to actually screw the gauge into the spark plug hole, just had to use the tapered rubber fitting and jam it into the spark plug hole.

SKWEARpeg wrote:
A good used running motor, can be had for about $800. Just a thought, if what Scott mentioned, is ringing any bells.
 
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#1020682
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Re:Firing on one cylinder 6 Months ago  
According to the manual the minimum is 142 psi, standard is 171 psi, and maximum is 199 psi. Page 3-19. Oh, and the difference between cylinders should not exceed 14 psi.
 
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Last Edit: 2017/08/27 11:06 By texasscott1.
 


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#1020684
Paladin (User)
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Re:Firing on one cylinder 6 Months ago  
Thanks. I'm definitely way off on that then. I'm thinking from everything I'm hearing that I'm just basically screwed.......

texasscott1 wrote:
According to the manual the minimum is 142 psi, standard is 171 psi, and maximum is 199 psi. Page 3-19. Oh, and the difference between cylinders should not exceed 14 psi.
 
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Re:Firing on one cylinder 6 Months ago  
Don't give up yet. You're not that far from removing the cylinders. If you were to find a rough cylinder surface or the crosshatch at the wrong angle I'd start complaining to Yamaha and the Dealer. Rarely cams show up on Ebay for a lot less than the dealer price.

Buying a low mileage engine from a reputable salvage place might be the best idea though. I'm wondering though how one would tell if the transmission recall had been done.
 
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#1020692
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Re:Firing on one cylinder 6 Months ago  
Before going and getting another engine make sure you've got an accurate read on that compression. It sounds like you may not have. if your decomp solenoid was activating during the check, pressure will read low, if the tapered rubber test line is not firmly seated, it will read low. Make sure the decomp solenoid is completely out of the loop, and maybe get some help holding the rubber line on good.

The black buildup could have been simply from running a while with the bad lifter, the rich gases burning and not expelling properly.

If your compression IS good you might only be looking at a cam and lifters which is a much smaller bite to chew off than an engine swap. I'm just saying,.. be sure before you assume you need a motor, that's all.

If you don't need one you may find someone on this forum that has a stock cam and lifters laying around from upgrading to a performance cam. You never know.
 
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#1020694
Paladin (User)
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Re:Firing on one cylinder 6 Months ago  
texasscott1 wrote:

Buying a low mileage engine from a reputable salvage place might be the best idea though. I'm wondering though how one would tell if the transmission recall had been done.


I was thinking exactly the same thing. Odds are taht it was done based on the number of people I've run into over the years that had it done vs those that didn't. But still, it'd be a crap shoot...
 
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