5105 rev limiting?

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2stroked2smoke

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Hey guys, just purchased a new dolmar 5105. Ran a few tanks through it and decided to turn it up to 14000. I leaned it out and can't get it to read right on my tach. It revs up to 1300 forjust a sec, then jumps back down to 10500 and holds. Is this a rev limiting coil? No matter how much I adjust the carb it does the same thing. I finally had to adjust it in the wood. Thanks
 
Yes it's the rev limiting coil that giving you bad tac readings. To get a good reading tune the saw dog rich than slowly lean it put until you get to 14,300 or so, the limiter shouldn't kick in until 14,500. This will give you a safe rpm and the saw will still run well.
 
So your saying I might have been too lean to begin with and was beyond the rev limiter already. That could be. I'll have to try it again tommorrow. Thanks
 
So your saying I might have been too lean to begin with and was beyond the rev limiter already. That could be. I'll have to try it again tommorrow. Thanks

Correct, and it's caused many inexperienced users to burn their saws up. For cutting firewood you want to set the saw somewhere under the limiter, for your saw 14,200-14,300 is safe.
 
I remember one of the Dolly dealers (Scott, Steve or Kyle) mentioning that at some time in the 5105's life that Dolkita were dropping the 14,500RPM coil and going back to a 13,500RPM limit coil, maybe that's already happened ?
 
PS-460, PS-510, PS-5105 coils limited at 13,800 as of March 2010.

If this is true, then you can't set the high side with a tach? I ran the saw for the first few tanks at the dealers settings.After having trouble setting with my tach, I put it in the wood and set it so it would fourstroke when lightly put in the wood and clean out and two stroke when putting it full into the cut. Is this the only way to set the saws with the rev limiter coils?
 
If this is true, then you can't set the high side with a tach? I ran the saw for the first few tanks at the dealers settings.After having trouble setting with my tach, I put it in the wood and set it so it would fourstroke when lightly put in the wood and clean out and two stroke when putting it full into the cut. Is this the only way to set the saws with the rev limiter coils?

No you can still use a tachometer.
 
Hey guys, just purchased a new dolmar 5105. Ran a few tanks through it and decided to turn it up to 14000. I leaned it out and can't get it to read right on my tach. It revs up to 13000 forjust a sec, then jumps back down to 10500 and holds. Is this a rev limiting coil? No matter how much I adjust the carb it does the same thing. I finally had to adjust it in the wood. Thanks

Something is wrong. I just purchased a 5105 built in july of this year, along with that I bought my first tach just for the heck of it. I usually tune by ear but wanted to see how the rpms related.
First thing I did was buy a used 5100 muffler and mod it, then I removed the needle limiters and twist the high out some. Made a few cuts with it (way rich) and then set the rpm to 13400 by leaning. Haven't run it since but the next time I do I will see where the coil limiter is set at. I was hoping to set it at 14200 next outing but it looks like they have changed the coil, gonna find out the next time I run her
 
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No, I just don't like running them up against the limiter. It's probably not real important, but I don't see much gain in 200 rpms.

I thought spec was actually 14,300-14,500 or something along those lines. I realize the limiter is below that, simply meaning you have to tune it in the wood. 13,500 would be a good starting place to do that. 800-1000 RPMs is a lot of power left on the table if richer than needed.
 
I thought spec was actually 14,300-14,500 or something along those lines. I realize the limiter is below that, simply meaning you have to tune it in the wood. 13,500 would be a good starting place to do that. 800-1000 RPMs is a lot of power left on the table if richer than needed.

Brad, read the thread ;)
 
Changing the rpm limit below what is optimal without doing other changes makes no sense to me, but I have a hunch about why they did it. Hopefully, they made other changes as well....
 
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