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YS FZ 91 to 110

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YS FZ 91 to 110

Old 11-07-2012, 06:52 PM
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wally3185
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Default YS FZ 91 to 110

Can you change a YS FZ 91 into a 110. Just wondering if the crank and con rod are the same between the two? Could you change the piston and sleeve or piston and cylinder head and have a 110? Or is the slight power increase worth the trouble or cost?
Old 11-07-2012, 07:31 PM
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speedracerntrixie
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Default RE: YS FZ 91 to 110

My guess would be that if it can be done, it would be crank, rod and piston/sleeve
Old 11-07-2012, 09:53 PM
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Gray Beard
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Default RE: YS FZ 91 to 110

Go into the glow engine forum then into the YS support and ask. I have never heard anyone ask the question. Years back the YS line was the .91 then the 1.20. Then they came out with the 1.10 that had the same specs as the 1.20 but the size of the .91 so they quit manufacturing the .91 and 1.20 and then it was the 1.10 then the 1.40. Now there is also the 1.15 and I thought they would have quit making the 1.10 by now but they haven't. The cost of just buying the new crank and rod would be close to the cost of a new 1.10. I bought an almost new 1.10 in a hobby shop for $100.00 and they are usually only about $150.00 at swap meets so why bother even if you can do it. The difference between the two is quite a bit but not enough to go through the expense and effort. I would never bother, mater of fact the thought would have never crossed my mind. Sort of like reinventing the wheel. The .91 outperforms other brands 1.20s. Just not the YS 1.10 or 1.20.
Old 11-08-2012, 08:53 PM
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Jetdesign
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Default RE: YS FZ 91 to 110

The first thing to look at is the stroke - should be a quoted spec. If they are the same, you can continue looking for similarities. If the stroke is different, you can't do it.

On many of the 2-stroke engines, they will 'over bore' something like a .46, giving it a larger diameter piston and a liner to fit, and make it a .51 or .55. I don't know that YS does this - I did a statistical analysis (for class) on OS and YS engines, and found an interesting relationship between bore/stroke and power. The YS seemed to benefit from increasing stroke, where OS (2 and 4 stroke both) did better with larger bore.
Old 11-11-2012, 07:15 PM
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rstearman
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Default RE: YS FZ 91 to 110

When the 110s first came out I switched all four of my 91s over to 110s. The 110s are great running engines but I didn't notice a change in performance..
If you have a good running 91 don't mess with it.

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