HenryM Posted May 6, 2014 Share Posted May 6, 2014 Hi all, Recently my pullstart would accasionaly come out without me pulling it very hard. basically it's not turning the engine over at all because it seems to just slip through. this problem only happens 20% of the time but i'm worried it;ll get worse. any ideas what the problem is? Quote Link to comment Share on other sites More sharing options...
gavin28 Posted May 6, 2014 Share Posted May 6, 2014 (edited) yeah, one way bearing, pretty common, easy to fix. edit: Here are some from the bay, check sizes though as i have never owned a Hyper 7 before http://www.ebay.co.uk/itm/HF0810-One-Way-Bearing-12mm-x-8mm-x-10mm-Needle-Rollers-NEW-/140956498305?pt=UK_ToysGames_RadioControlled_JN&hash=item20d1a97981 This needs a vice or simalar to press out the old one and press in the new one but not everyone is equiped or comfortable doing this so heres a ready made one - straight swap http://www.ebay.co.uk/itm/NEW-Pull-Start-One-Way-Bearing-12mm-Hex-6-mm-Shaft-12-x-6-Pullstart-Free-POST-/141216686871?pt=UK_ToysGames_RadioControlled_JN&hash=item20e12ba317 Edited May 6, 2014 by gavin28 1 Quote Link to comment Share on other sites More sharing options...
Yoshimoto Posted May 6, 2014 Share Posted May 6, 2014 Half the time a good clean will cure it,rinse in paraffin/turps/degreaser-even hot soapy water will do,i re-oil mine with afterun-not too slippy-just enough Yoshi 1 Quote Link to comment Share on other sites More sharing options...
HenryM Posted May 7, 2014 Author Share Posted May 7, 2014 thanks will Half the time a good clean will cure it,rinse in paraffin/turps/degreaser-even hot soapy water will do,i re-oil mine with afterun-not too slippy-just enough Yoshi do Quote Link to comment Share on other sites More sharing options...
shdaxner Posted May 7, 2014 Share Posted May 7, 2014 I found that once it had started slipping (generally indicating a leak from the backplate somewhere) it will continue to slip until the leak is sorted, you may clean it and get a good few pulls from it but then it would start slipping again. Best to try sort the leak out whilst your cleaning it. Quote Link to comment Share on other sites More sharing options...
Anthoop Posted May 7, 2014 Share Posted May 7, 2014 I found that once it had started slipping (generally indicating a leak from the backplate somewhere) it will continue to slip until the leak is sorted, you may clean it and get a good few pulls from it but then it would start slipping again. Best to try sort the leak out whilst your cleaning it. The Hyper engines have the bearing inside the crankcase...it is always lubricated...lubrication is good for the bearing but gummy/old oil is not. Exploded view of engine here (note OWB in the fan shaped part)- http://www.cmldistribution.co.uk/diagrams/HoBao/Engines/HB_Engine_settings_Hyper_21%20_3-Port.pdf Quote Link to comment Share on other sites More sharing options...
gavin28 Posted May 8, 2014 Share Posted May 8, 2014 (edited) In that case its one of these you need http://www.ebay.co.uk/itm/HOBAO-HYPER-7-21021-Hobao-Hyper-21-Oneway-Bearing-And-Turbofan-Housing-/141268801165?pt=UK_ToysGames_RadioControlled_JN&hash=item20e446d68d but i would just measure the old one and buy a bearing like this http://www.ebay.co.uk/itm/One-Way-Bearing-10mm-OD-x-6mm-ID-x-12mm-W-10-x-6-x-12-/250996539641?pt=UK_ToysGames_RadioControlled_JN&hash=item3a708f40f9 and press out the old one and press in a new one if you want to save about Edited May 8, 2014 by gavin28 Quote Link to comment Share on other sites More sharing options...
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