mattadon Posted May 11, 2011 Share Posted May 11, 2011 Hey guys only recently started playing with nitro. Brought a GST 7.7 ( i know not the greatest choice in the world, but got it at a good price ). Still in the process of breaking in but today for some reason the rota start just freely spins. After looking on the internet i get the opinion it might be the 1 way bearing is this a possibility? and also where can i buy a new 1and does it need to be a cen 1 or can i get a universal 1? Any info muchly appreciated. Thanks Matt. Quote Link to comment Share on other sites More sharing options...
Pearce Posted May 11, 2011 Share Posted May 11, 2011 Rota starts are very common for it , let it cool down , unless it's split ( possibily) it should go back to catching Otherwise , alternatives are , pull start , starter box of fly wheels below chassis . Quote Link to comment Share on other sites More sharing options...
mattadon Posted May 11, 2011 Author Share Posted May 11, 2011 Thanks for the quick reply pearce i will try again tomorrow. Any idea where i can get a new owb if it is faulty? and does it need to be a cen one? once again thanks for assistance. Matt Quote Link to comment Share on other sites More sharing options...
Spriggan Posted May 12, 2011 Share Posted May 12, 2011 The outer bearing is different on many models, you will probably need the correct on for the engine. If you are breaking the engine in, there is a far chance the OWB has been overloaded and failed, did you slacken of the glowplug a 1/4 a turn when starting to allow the engine to turn over easier? If the bearing is just slipping it can be cleaned out with spirit or brake cleaner to remove any excess oil that may be on it. Quote Link to comment Share on other sites More sharing options...
Yrkoon Posted May 14, 2011 Share Posted May 14, 2011 my savage 3.5 is very bad for the roto start slipping eg not gripping. seems to be a lot of oil etc getting through the back plate onto the one way bearing and shaft, if i take it apart and clean the oily stuff off it it works like a charm for a few minutes lol ive basically resorted too using a fuel filter that also has a little squeezy thing to prime it with and my roto start catches for the first second of pressing the button then stops, i so i keep priming it with the wee squeezy pump bit and press the roto start in 1 second bursts it always ends up starting but its a pain. Quote Link to comment Share on other sites More sharing options...
Spriggan Posted May 14, 2011 Share Posted May 14, 2011 Those Savage back plates are terrible for leaking when they get a bit worn, I tried cutting O rings into the starter shaft and all sorts or bodges to stop it, some helped some didn't. Ended up drilling a small hole in the center of the rota start to be able to squirt WD40 at the bearing, which helped clean it up enough to work most of the time. Quote Link to comment Share on other sites More sharing options...
Yrkoon Posted May 18, 2011 Share Posted May 18, 2011 (edited) dad ended up with a spare trophy truggy 4.6 engine so i just put that in the savage and no more problems lol cept its a pig too handle at the speed the savage does now, i hope that back plate lasts longer Edited May 18, 2011 by Yrkoon Quote Link to comment Share on other sites More sharing options...
Stormbringer Posted May 18, 2011 Share Posted May 18, 2011 you may have to just bite the bullit and get a new backplate for it to stop it slipping Yrkoon dont crow so quick lad as when that engines had the fuel the savvy has had through it its gonna be just the same ( i believe its same backplate for 3.5 and 4.6 ) Quote Link to comment Share on other sites More sharing options...
Yrkoon Posted May 19, 2011 Share Posted May 19, 2011 (edited) you may have to just bite the bullit and get a new backplate for it to stop it slipping Yrkoon dont crow so quick lad as when that engines had the fuel the savvy has had through it its gonna be just the same ( i believe its same backplate for 3.5 and 4.6 ) lol dad has spoken id better save up for a new 4.6 backplate, just happy i can prime and start the savvy now with no messing about Edited May 19, 2011 by Yrkoon Quote Link to comment Share on other sites More sharing options...
Stormbringer Posted May 19, 2011 Share Posted May 19, 2011 lol dad has spoken id better save up for a new 4.6 backplate, just happy i can prime and start the savvy now with no messing about yup Quote Link to comment Share on other sites More sharing options...
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