When it comes to the easy starter, assuming that is a rovan part, the one with the plastic internals will outlast the one with the cast alloy internals. I have experience with both actually. The one with metal parts has an anti-seize grease loaded up around the center screw and washer. Eventually that screw will back out and everything goes to crap in no time. I am not fond of winding springs and have rebuilt the metal one several times until it became useless.
This is the one that was more of a headache to use:
https://www.rovanrc.com/product-rv85277s
This one works much better than the aluminum one. I have yet to have issues with it.
https://www.rovanrc.com/product-rv85247
I believe Turtle Racing has one that is similar but different. For some reason or another I think it was pulled out of production. I cannot find it on DDM Racing's website (you can get the spare parts for it but not the complete kit). I do remember reading some reviews on it, not many were happy campers. This is what it looked like:
http://turtleracingproducts.com/products/v2-pull-start/ Here is one of the issues found on youtube:
However, on my other Baja that is not a Rovan or King Motor, I use this one:
https://www.detroitperformancerc.com/product-page/rcmax-zenoah-cy-billet-easy-start
It will not fit under the body panels unless you modify them. I recommend the outerwears cover specifically for the Taylor RC pull start. It keeps the dust out. I have it mounted on a Taylor 35cc engine. Before I used that engine, also used it with a Zenoah-ESP G340RC engine. As I found with the Rovan design, a similar issue can happen with this one, the spring loaded levers may get stuck in the run position due to dust collection. Having the outerwears screen to keep the fine dust out works. You will need the underside engine cover as well. Grass is not the issue, the fine dust and sand tends to cause issues.
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I would agree with Doug on the stock pull start for the Zenoah. That is what I am using right now with the Z-ESP G340. It may seem difficult to pull due to compression but that is just the first few pulls (with the choke on). It does get easier once you figure out the method.