AndyD Posted September 2, 2017 Share Posted September 2, 2017 ive just converted my old black horse spitfire back to petrol yet again this time with a rcgf 26,although its started fine it wouldn't slow down to a agreeable tick over,on striping the carb the butterfly screw was loose and putting it back seemed to have made it better(no wonder) but its still a little bit on the fast side for a tick over but ive run out of all adjustment,any ideas.sweet little motor for the money if only I could drop the revs another 500 Quote Link to comment Share on other sites More sharing options...
flight1 Posted September 2, 2017 Share Posted September 2, 2017 If it is new then before you try to get a low tick over run it in some then tweek Quote Link to comment Share on other sites More sharing options...
AndyD Posted September 2, 2017 Author Share Posted September 2, 2017 I'm hoping for the best but it sees to be getting faster as it runs in,early days its only had just over an hour running.ive never come across it before but they state not to run it in on a test stand as theres not enough shock absorbing but to run the engine in on the air frame. Quote Link to comment Share on other sites More sharing options...
chris evans 8 Posted September 8, 2017 Share Posted September 8, 2017 richen the LE needle a bit? Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted September 8, 2017 Share Posted September 8, 2017 It will tick over more freely ( faster ), as it " runs in ", as you found. 16 x 8 ? Double check that the motor is propped enough to be loaded too, as maybe its still the running in prop Edited By Denis Watkins on 08/09/2017 06:25:43 Quote Link to comment Share on other sites More sharing options...
Kim Taylor Posted September 8, 2017 Share Posted September 8, 2017 Make sure that you've got the butterfly 'centred' as you do the screw(s) up. If it's running fast, there's air getting in from somewhere. Kim Quote Link to comment Share on other sites More sharing options...
AndyD Posted September 17, 2017 Author Share Posted September 17, 2017 the engine runs really sweetly,but as its running in more(over two hrs now)its seems to be getting faster and faster,i can slow it down some by winding the le needle out but as it is its very rich the models covered in oil.someone suggested soldering over the hole in the butterfly so ive just tried that but again no difference,ive checked for air leaks the best I can but now given up for the day with a cuppa.also someone suggested a walbro carb,ive got one off a 22 but noticed the rcgf carb as a crackcase pipe going to it so could I block this and use a walbro,many thx Andy. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted September 17, 2017 Share Posted September 17, 2017 Throttle stop screws not preventing it closing properly is it ?(you took it out) it got a good seal on the insulator block ? Quote Link to comment Share on other sites More sharing options...
AndyD Posted September 17, 2017 Author Share Posted September 17, 2017 Hi John,screw is out and it all seems to seal nice an tight,ive even removed the throttle servo to make sure its closing and when its completely closed off its still reving to high,it must be getting air in some how but how I'm yet to find out Quote Link to comment Share on other sites More sharing options...
AndyD Posted September 17, 2017 Author Share Posted September 17, 2017 couldn't settle so out with the engine again but this time with success,stripped all the carb and block off and with close examination found a hair line crack in the carb block,even forcing it apart was only just visible,now the hard job of finding another one Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted September 17, 2017 Share Posted September 17, 2017 Had it myself on a Fuji, drove me mad trying to find the fault, hope you find new one. Quote Link to comment Share on other sites More sharing options...
iqon Posted September 17, 2017 Share Posted September 17, 2017 Hobbyking sell them, i changed mine not so long ago Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted September 17, 2017 Share Posted September 17, 2017 H.K Quote Link to comment Share on other sites More sharing options...
AndyD Posted September 17, 2017 Author Share Posted September 17, 2017 many thx Quote Link to comment Share on other sites More sharing options...
AndyD Posted September 17, 2017 Author Share Posted September 17, 2017 just ordered a new block £2.47 the bad bit £11.61 postage,there were dearer options over £20 and cheaper ones but I want it this year so now the wait. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted September 17, 2017 Share Posted September 17, 2017 Wow Andy, well done, it had to be a leak, and you found it. In future, because of your detective work, we can check for this one right away Edited By Denis Watkins on 17/09/2017 20:54:23 Quote Link to comment Share on other sites More sharing options...
cymaz Posted September 17, 2017 Share Posted September 17, 2017 Well spotted Andy Quote Link to comment Share on other sites More sharing options...
onetenor Posted September 17, 2017 Share Posted September 17, 2017 Take a hacksaw and saw down the crack till all the way through. Now tap in a wooden wedge to open the gap a little:. not too much or you'll crack the other side.Now mix some epoxy slow setting and warm it so it's a bit softer in slip it into the gap. Take out the wedge and let the gap close .When set but still green level off any excess glue and either keep it in the spares box or reassemble to the engine with new gaskets Unlikely to work without sawing first. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted September 17, 2017 Share Posted September 17, 2017 £20 n you're flying again rather than scratching your head in frustration, bargain at the price. Quote Link to comment Share on other sites More sharing options...
onetenor Posted September 17, 2017 Share Posted September 17, 2017 Posted by onetenor on 17/09/2017 22:09:18: Take a hacksaw and saw down the crack till all the way through. Now tap in a wooden wedge to open the gap a little:. not too much or you'll crack the other side.Now mix some epoxy slow setting and warm it so it's a bit softer in slip it into the gap. Take out the wedge and let the gap close .When set but still green level off any excess glue and either keep it in the spares box or reassemble to the engine with new gaskets Unlikely to work without sawing first. Just thought on. If it is new get onto the supplier for a replacement. That postage is a heck of a lot where is it coming from? Quote Link to comment Share on other sites More sharing options...
AndyD Posted September 17, 2017 Author Share Posted September 17, 2017 3-10 days from china,ive had it well over a year but only just got round to using it,shall have ago at fixing it so I can fly next weekend.had a few flights today but the landings are bit scarey coming in a bit on the fast side,nice when the wind picked up to slow it up abit. Quote Link to comment Share on other sites More sharing options...
AndyD Posted September 19, 2017 Author Share Posted September 19, 2017 been rushing about sorting my carb block,got it finished last night ready to fit tonight but got a text today to say the new one will be delivered Thursday,impressed 4 days from china,at least I have a spare but hopefully wont need it.i ve,ed the crack plus afew 1mm holes(not drilled right through) then a coating of chemical metal to finish. Quote Link to comment Share on other sites More sharing options...
AndyD Posted September 23, 2017 Author Share Posted September 23, 2017 down the club today hoping for a nice flying session,new parts on set back to factory settings and still not running right,but after about an hour it wont even start now,healthy spark petrol but wont fire up even though it gives a good kick back now and again,re done the tank and with another ign module but still the same,charged the battery and even swapped it with a identical engine but still the same,so I'm thinking its got to be the battery even though my charger says its full,as my battery checkers no good is there anything ive missed or I can try,(before tempers get to bad) many thx Andy Quote Link to comment Share on other sites More sharing options...
iqon Posted September 23, 2017 Share Posted September 23, 2017 make sure carb getting fuel ie no problems with tank.. then if you can get to it squirt fuel into carb.Also dont take factory settings as being right the needles may need to be taken out further. Edited By iqon on 23/09/2017 17:34:33 Quote Link to comment Share on other sites More sharing options...
AndyD Posted September 23, 2017 Author Share Posted September 23, 2017 as ive tried two engines with the same results its got to be fuel or spark but both seem good,im still going electric as when it was still running it was as if the ign was cutting in and out at low rpm but it all seems to check out ok so it could be fuel ,lol Quote Link to comment Share on other sites More sharing options...
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