Ninjashunt Posted December 1, 2014 Share Posted December 1, 2014 Hi there, Just got a cheap 2nd hand hyper st and it has a roto start but want to swap this to a pull start. Do I only need a new pull start as on modelsport for Quote Link to comment Share on other sites More sharing options...
Anthoop Posted December 2, 2014 Share Posted December 2, 2014 Yes if it has the Macstar.28 then you just need the pullstart. Note the pullstart from the .21 Hyper engine will also fit...and I expect "marderboy" on Ebay could do it cheaper. Quote Link to comment Share on other sites More sharing options...
Ninjashunt Posted December 2, 2014 Author Share Posted December 2, 2014 That's great thanks I'll have a look then Quote Link to comment Share on other sites More sharing options...
Ninjashunt Posted December 5, 2014 Author Share Posted December 5, 2014 Took the roto start off and underneath it is a different shape to that on the Mach 28 pull start I have, does that mean the last owner changed the back of the engine? Quote Link to comment Share on other sites More sharing options...
Anthoop Posted December 6, 2014 Share Posted December 6, 2014 I would not think so....but anything is possible.....got any pictures? Usually this is the type of parts that would have been used to convert it to roto- http://www.modelsport.co.uk/index.php?product_id=25032&gclid=CNfe5fX3sMICFWPLtAodE1gAXg The bevel gear will just pull off. Quote Link to comment Share on other sites More sharing options...
Ninjashunt Posted December 9, 2014 Author Share Posted December 9, 2014 The backplate was standard so it was a different one way bearing and axle, so ordered a hex axle from Marderboy and will try that first and then may have to get a new one way bearing. Do you know if i should clean or lube the old one way bearing before fitting a new axle and what should you use? Thanks Quote Link to comment Share on other sites More sharing options...
Anthoop Posted December 9, 2014 Share Posted December 9, 2014 The Macstar.28 (and Hyper.21) have the one way bearing inside the engine..part number 28021 in the picture at the bottom of this link... http://www.cmldistribution.co.uk/diagrams/HoBao/Engines/HB_Engine_settings_MacStar_28.pdf If you are using the old bearing then it will be fine as is.....if it was slipping then you should remove it and clean it....I always oil a cleaned or new bearing before refitting and I use air tool oil (any light oil will be fine...but note that many people do not oil them). Quote Link to comment Share on other sites More sharing options...
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