ORIGINAL: ThumbSkull
That's not off the shelf performance like the YS is. I've had two Saito 180's and they are great engines just not on the level of YS 140 performance unless you modify it.
You are right, but probably less invested than W/the (new) for big bore carb & CDI. $280 + $440 for a new 180B engine. $720 total & it will use less fuel than the glow ignition YS & impecible manners.
Actually I had far less than $440 in the engine itself. ($347.75) I had a clapped out neglected/abused FA150 from which I used the case, cam, pusrods, rockers, etc. I used it as a basis for the [link=http://www.rcgroups.com/forums/showthread.php?t=1754616]HIGH COMPRESSION FA180 PROJECT.[/link]
I am so pleased W/the outcome that I'm going to go reduce the case deck on the stock FA180 that I have to get the same results.
Heck it uses 20% less fuel than the stock FA180!
Here's the 1st prototype W/the stock FA180 carb on 15% Cool Power.
[youtube]http://www.youtube.com/watch?v=5xaiAR8Yelc[/youtube]
I'd bet that YS11140DZ won't flip start & idle like that. Although CDI would tame it down a lot.
I've managed to get [link=http://www.rcgroups.com/forums/showthread.php?t=1769449]SIGNIFICANT POWER IMPROVEMNTS[/link] since this video was shot. The 220 big bore carb picked up 400 RPM & 30% nitro got another 400 RPM. There's 9000 in it W/some better (pressurized) fuel delivery & tuning, it was surging to 9000.