funny you should metion that you still have the pullstart b/c you're still contemplating. on your cen truggy, that is. i'm sort of in the same boat, as i recently shelved my italian bump start engine for inspection and maintenance. i dropped in the stock cen engine that i received under warranty from cen b/c i need it until i can figure out the .21 axe rossi. thing is you have to use the xtm 24.7 backplate with either the xtm 24.7 pull start plate or the ofna roto start plate if you want to use a starter box with the SH engine because you have to place it on spacers because of it's gigantic backplate. you can convert it to bump start only using a cen .28 backplate, however, you have break out the dremmel and cut the crankpin, i'm told. i'm researching that ordeal as we speak. so with all that in mind, i must ask, are you able to use a starter box on the stock set up, if so, how? i really don't want to open this engine up, just yet. plus, if i convert, i'd like to go the bumpstart backplate route, but instructions and pictures are hard to come by. i mean, i've been trying to find a picture of the process for two weeks now. especially the crankpin mod. it'd be great to know the what, when, where, why and how, as it relates to cutting the crank [sm=72_72.gif]

matrix tr arena .28 SH pullstart to bump start conversion:

parts: http://store.outacontrolhobbies.com/mipa.html
instructions: http://aedownloads.com/pdf/backplate_web.pdf and http://findarticles.com/p/articles/m...08/ai_n8962478

finally decided to go for it