KenC Posted March 4, 2023 Author Share Posted March 4, 2023 Thanks Jonathan thats a very kind offer ...... Now let me go search for that set of bits in a set . Quote Link to comment Share on other sites More sharing options...
Jonathan W Posted March 4, 2023 Share Posted March 4, 2023 I don't have a 46 FX, but just checked on an AX and the head screws are definitely M3 with a 2.5mm hexagon socket head. Quote Link to comment Share on other sites More sharing options...
KenC Posted March 4, 2023 Author Share Posted March 4, 2023 Jonathan the 46 AX has 4 head bolts I believe, the OS 46 FX has 6 and I just tried an M3 hex from a set that is marked , and it was way too big . Quote Link to comment Share on other sites More sharing options...
Jonathan W Posted March 4, 2023 Share Posted March 4, 2023 (edited) The screw thread is M3 but the hexagon size in the head is 2.5mm. So try one that is marked 2.5 I just dug out an old OS 45 FSR. Lovely quality engine, must be 40 years old! It has 6 head screws which also need a 2.5mm hexagon key, or bit. Edited March 4, 2023 by Jonathan W more info Quote Link to comment Share on other sites More sharing options...
KenC Posted March 4, 2023 Author Share Posted March 4, 2023 Thanks , Jonathan I shall have to pop out tomorrow and see if I can find a 2.5 hex. If these heads do get a bit damaged removing them, is it possible to get replacements. Are they common ? Quote Link to comment Share on other sites More sharing options...
Jonathan W Posted March 4, 2023 Share Posted March 4, 2023 The screws are easily found at Modelfixings Not expensive. On a Sunday, probably Halfords would have decent quality set of metric keys or bits. Quote Link to comment Share on other sites More sharing options...
KenC Posted March 4, 2023 Author Share Posted March 4, 2023 Great will try them and Screwfix. Quote Link to comment Share on other sites More sharing options...
Andy Stephenson Posted March 4, 2023 Share Posted March 4, 2023 For a partially rounded Allen head screw I have taken the next size Allen key up and ground a shallow taper on each face so it just goes into the screw head. Then I hammer it in tightly. This usually gives enough grip to successfully undo it. 1 Quote Link to comment Share on other sites More sharing options...
Jon H Posted March 4, 2023 Share Posted March 4, 2023 (edited) 1 hour ago, Jonathan W said: Well, I've seen far worse. If they feel smooth, I think the engine would run OK with those bearings, but they would need replacing in the near future. Exactly right. I have seen worse too but its already half in bits so you might as well do the job now. Also if a bearing should break up (remember they rotate around 180 times a second at full power) you completely destroy the engine. Its better to just do the work now and not take any chances. If you are really struggling with the screws then that does make life difficult. I was going to offer help with the work if you were really suck but Jonathan beat me to it. Also i tend to favour teaching someone to do the work as its a skill they will always have. Teach a man to fish and all that. I also dont want to open an engine serving business just yet! The other comments on allen keys/screws etc are all perfectly good advice. A decent set of allen drivers are really useful so dont think of them as a one time purchase just for this job. They will always come in handy. Edited March 4, 2023 by Jon - Laser Engines Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted March 4, 2023 Share Posted March 4, 2023 Decent Allen drivers are essential for these jobs. Allen keys will round off and damage the screw heads . Ground HSS drivers are the way to go. Quote Link to comment Share on other sites More sharing options...
Richard Acland Posted March 5, 2023 Share Posted March 5, 2023 Having repaired a few gummed up engines over the years, when it comes to seized carbs I find a 24 immersion in glow fuel works wonders. Quote Link to comment Share on other sites More sharing options...
KenC Posted March 5, 2023 Author Share Posted March 5, 2023 Thanks for all the amazing answers and help from all. Must say that the spares prices from the stockists are sparse and silly prices. If you add up sleeve , piston, and 2 bearings from the official folk , its more than a Force engine NEW ! After only owning OS 2 Stroke for decades, its time to protest with my feet. If these things are going to be disposable lets keep the price low. Quote Link to comment Share on other sites More sharing options...
Jon H Posted March 5, 2023 Share Posted March 5, 2023 7 minutes ago, KenC said: Thanks for all the amazing answers and help from all. Must say that the spares prices from the stockists are sparse and silly prices. If you add up sleeve , piston, and 2 bearings from the official folk , its more than a Force engine NEW ! After only owning OS 2 Stroke for decades, its time to protest with my feet. If these things are going to be disposable lets keep the price low. Part of the issue is the fx range was discontinued about 15 years ago so spares are going to be thin on the ground these days. Even so, rebuilds on 2 strokes have always been questionable in terms of value and as you rightly point out, new engines are 100-150 quid. A brand new OS46ax is about 140 and the bigger 55 barely a tenner more. Quote Link to comment Share on other sites More sharing options...
KenC Posted March 5, 2023 Author Share Posted March 5, 2023 Yes Jon your right, I am still amazed at the Ripmax OS spares Carb £50 , Bearings X 2 £35, Crank £33, needle £14 We are at the price of a new one and we don't have 60% of the engine ! Anyway I am being old and moaning 🙂 Quote Link to comment Share on other sites More sharing options...
Jonathan W Posted March 5, 2023 Share Posted March 5, 2023 Aye, but try buying spare parts for your car and see how much a big repair soon exceeds the economic value! The bearings will cost you less than £8 for the pair at Simply Bearings. If I remember correctly, your carb just needs freeing up. Did you manage to get the head off and look at the bore? If the bore is good, all you need to buy is the bearings. If the bore is flaking, the engine is unfortunately scrap, or just run it until it dies. Quote Link to comment Share on other sites More sharing options...
Nick Cripps Posted March 5, 2023 Share Posted March 5, 2023 Try RC Japan for OS parts here. The order process is a bit convoluted but my last order came in just over a week so works well. Add a few glowplugs as well at about half the UK price. Quote Link to comment Share on other sites More sharing options...
Andy Stephenson Posted March 5, 2023 Share Posted March 5, 2023 There are a lot of bogus OS no8 plugs out there but you can be assured that you will get the real thing from RC Japan and at a good price. The last order I made with them came with no surcharges at all. Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted March 6, 2023 Share Posted March 6, 2023 11 hours ago, Nick Cripps said: Try RC Japan for OS parts here. The order process is a bit convoluted but my last order came in just over a week so works well. Add a few glowplugs as well at about half the UK price. I checked their website and couldn't find any bits for the Fx range . Brilliant company . Order posted on Friday . Arrived on Tuesday ! And at less than half the cost of UK sorted parts Inc postage ! Thoroughly recommend them. 1 Quote Link to comment Share on other sites More sharing options...
RottenRow Posted March 6, 2023 Share Posted March 6, 2023 A chap on the BMFA Classifieds is advertising three Thunder Tiger 42 2 strokes for £62 including postage. Perhaps not quite an OS but a much simpler solution and at £20 each cost no more than one set of new bearings. https://classifieds.bmfa.org/acadp_listings/tt-gp42-2-stroke-x-3 Brian. Quote Link to comment Share on other sites More sharing options...
Nigel R Posted March 6, 2023 Share Posted March 6, 2023 Should we hold off until KenC has popped the lid off his existing engine and had a look at the liner before we start suggesting too many solutions..? Quote Link to comment Share on other sites More sharing options...
KenC Posted March 6, 2023 Author Share Posted March 6, 2023 Gents, thanks to the expert hand of my local Consultant ... and at his best advice having opened the magic box and studied the piston and sleeve, its a runner !! So I have bought some fuel and will run her up in a couple of days. We are going to watch the bearings and at the very slightest ill sound I will abort and replace. My thanks for his cleaning and checking ..... The Engine Doctor aka Phil. Quote Link to comment Share on other sites More sharing options...
Jonathan W Posted March 7, 2023 Share Posted March 7, 2023 Good to hear that you got it all sorted by a helpful forum member local to you. How was the difficulty removing the head resolved? Quote Link to comment Share on other sites More sharing options...
KenC Posted March 8, 2023 Author Share Posted March 8, 2023 Ha ha Jonathan , it is easy when you have a good hand on a well made tool ! Quote Link to comment Share on other sites More sharing options...
KenC Posted March 8, 2023 Author Share Posted March 8, 2023 On 06/03/2023 at 09:26, Engine Doctor said: I checked their website and couldn't find any bits for the Fx range . Brilliant company . Order posted on Friday . Arrived on Tuesday ! And at less than half the cost of UK sorted parts Inc postage ! Thoroughly recommend them. Yes I had looked too , and at the other similar that you suggested. Just engines had none of the parts for any of them . Quote Link to comment Share on other sites More sharing options...
David Foley Posted March 8, 2023 Share Posted March 8, 2023 As many will be aware, the ASP Piston/Liner is a perfect fit for the FX and true ABC. In Stock at Just Engines. Quote Link to comment Share on other sites More sharing options...
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