With LRP nitro rc engines you can buy optional parts to convert any of the .30 and .32 engines to bumpstart, roto start or pullstart with the part numbers in picture. For the LRP .28 pullstart engine you can also use the roto start backplate part# LRP38146 to convert from pullstart to rotostart.
All part numbers:
LRP38146, LRP38556 , LRP38557, LRP38146
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