mainstreet Posted May 29, 2017 Share Posted May 29, 2017 Hi Took my MCD out today and its been running well, no issues at all. After a couple of mins it it started to bog down under WOT. Soon after that you could hear it lean out at idle and then stop. Restarting proved tricky, as the only it would start would be by re-priming the carb (although it would only reprime if the car was on an angle even though it had about 1/3 full of fuel) It would then run for a couple of mins then the same issue would occur; bogging down, lean at idle then stop. Any ideas? The video below is just after initial startup, and at about 29 secs in, it starts to bog, but only slightly, later on it got worse. 1 Quote Link to comment Share on other sites More sharing options...
Rover Man Posted May 29, 2017 Share Posted May 29, 2017 from your "(although it would only reprime if the car was on an angle even though it had about 1/3 full of fuel)" i would say the pipe to the carb are the wrong way round. The pipe with the filter on the end that sits in the tank goes to the bottom of the carb. the other (return) pipe goes to the top and should sit in the tank by 50mm or so Quote Link to comment Share on other sites More sharing options...
mainstreet Posted May 29, 2017 Author Share Posted May 29, 2017 Hi, the pipes are in their correct places, the clunk in the tank is connected to the bottom carb inlet. Bit odd really as it was running fast the other week 1 Quote Link to comment Share on other sites More sharing options...
Rover Man Posted May 29, 2017 Share Posted May 29, 2017 Have you checked the vent in the fuel cap ?? 1 Quote Link to comment Share on other sites More sharing options...
Baja_Crazy Posted May 29, 2017 Share Posted May 29, 2017 its hard to tell if this problem comes on as you were driving straight away. i would give the tank cap a good clean go over the fuel lines see if they looking good and what not check around the gaskets to see if theres anything abnormal does the carb air purge/ primer bulb remain full and doesn't drain fuel ? Quote Link to comment Share on other sites More sharing options...
mainstreet Posted May 29, 2017 Author Share Posted May 29, 2017 Will do. No the bulb will drain when the engine is running 1 Quote Link to comment Share on other sites More sharing options...
atom3624 Posted May 29, 2017 Share Posted May 29, 2017 Silly question - how old is the fuel? What mix is it? Almost sounds like it's oiling the plug by the description. (Going to watch the video now.) Al. Quote Link to comment Share on other sites More sharing options...
Fly In My Soup Posted May 29, 2017 Share Posted May 29, 2017 I had an extremely similar issue last year on my kyosho arc. Mysterious bog appeared after it was running ok, gradually got worse over a week or so, then became difficult to start, would idle OK but immediate bog on throttle. My issue starts halfway through second thread page. I checked umpteen things, including all of the above and much more (shifted carb gaskets etc etc), then focused on carb itself, stripped it, inspected diaphragm, jets etc, cleaned it, still no luck, bought a new carb, and hey presto ran like a champ. My moneys on carb Quote Link to comment Share on other sites More sharing options...
Baja_Crazy Posted May 30, 2017 Share Posted May 30, 2017 14 hours ago, mainstreet said: Will do. No the bulb will drain when the engine is running Okay in that case its going to be carb orientated, have another look at the fuel lines to make sure there no cracks/ leaking. then i would take the carb of give her a clean through the jets and screen filter preferably with carb cleaner or brake.. clean of all the gaskets and diaphragm with WD40/GT85 (dont use carb cleaner as it will dry and degrade the diaphragm) have a good look and the diaphragm to see if it looked disfigured/ stretched. if so replace and try to start her same goes for if its okay as the jets/filter could be blocked. 1 Quote Link to comment Share on other sites More sharing options...
mainstreet Posted May 30, 2017 Author Share Posted May 30, 2017 My money is on the carb too. I'm going to install a 990 and see what happens. The fuel is about 2 weeks old with a 28% mix Quote Link to comment Share on other sites More sharing options...
Fly In My Soup Posted May 30, 2017 Share Posted May 30, 2017 Good plan Quote Link to comment Share on other sites More sharing options...
marder Posted May 31, 2017 Share Posted May 31, 2017 First off refill the tank see if any difference, I'd also say vent in fuel cap blocked But fill tank 1st then rule out fuel starvation as could just be feed pipe needs pushing in little more Quote Link to comment Share on other sites More sharing options...
Fly In My Soup Posted May 31, 2017 Share Posted May 31, 2017 27 minutes ago, marder said: First off refill the tank see if any difference, I'd also say vent in fuel cap blocked But fill tank 1st then rule out fuel starvation as could just be feed pipe needs pushing in little more Where assuming op checked fuel tank to ensure its full of enough fuel.....? Quote Link to comment Share on other sites More sharing options...
Fly In My Soup Posted May 31, 2017 Share Posted May 31, 2017 On 29/05/2017 at 17:58, mainstreet said: about 1/3 full of fuel You did actually refill it with fuel mainstreet before you re tried yes?? And your using a felt clunk for fuel pickup? Quote Link to comment Share on other sites More sharing options...
mainstreet Posted May 31, 2017 Author Share Posted May 31, 2017 Yup was a full tank. I have a vented tank and I use a filtered clunk like this http://www.pyramidmodels.com/shop/product.php/1065/large_fuel_clunk_with_filter_for_gas_turbine_powered_models Quote Link to comment Share on other sites More sharing options...
mainstreet Posted May 31, 2017 Author Share Posted May 31, 2017 Yup was a full tank. I have a vented tank and I use a filtered clunk like this http://www.pyramidmodels.com/shop/product.php/1065/large_fuel_clunk_with_filter_for_gas_turbine_powered_models 1 Quote Link to comment Share on other sites More sharing options...
Fly In My Soup Posted May 31, 2017 Share Posted May 31, 2017 Just checking, carb it is then! Quote Link to comment Share on other sites More sharing options...
mainstreet Posted May 31, 2017 Author Share Posted May 31, 2017 I reckon so, the 990 has arrived so I'll install it hopefully tonight 1 Quote Link to comment Share on other sites More sharing options...
Fly In My Soup Posted May 31, 2017 Share Posted May 31, 2017 (edited) Fingers crossed ! Almost certainly a blocked jet Edited May 31, 2017 by Fly In My Soup Quote Link to comment Share on other sites More sharing options...
mainstreet Posted June 3, 2017 Author Share Posted June 3, 2017 Quick spin with the new carb. Seems a lot better 1 Quote Link to comment Share on other sites More sharing options...
atom3624 Posted June 3, 2017 Share Posted June 3, 2017 Which carb did you go for - 990 or 813? Al. Quote Link to comment Share on other sites More sharing options...
Fly In My Soup Posted June 3, 2017 Share Posted June 3, 2017 On 31/05/2017 at 14:06, mainstreet said: I reckon so, the 990 has arrived so I'll install it hopefully tonight 990 1 Quote Link to comment Share on other sites More sharing options...
atom3624 Posted June 3, 2017 Share Posted June 3, 2017 Late at night again ... finishing BGT then reading the latest bridge stupidity ... hope all known on the forum are safe, and relatives. Al. 1 Quote Link to comment Share on other sites More sharing options...
Fly In My Soup Posted June 4, 2017 Share Posted June 4, 2017 Enlighten me dude???? I don't get time to watch the news, or TV much at all Edit I've just googled bridge nevermind Quote Link to comment Share on other sites More sharing options...
mainstreet Posted June 4, 2017 Author Share Posted June 4, 2017 (edited) Took it out for another spin today, seems to be running well. A slight mishap with a tree stump suddenly made it front wheel drive https://photos.google.com/share/AF1QipOKpMBA2qsLMn9S_Co5uCVrvOk1rSnB4n7jbL8YDonAMHnwfEdR0-rzDIROUpW1tw?key=SmVqWnBUQzVsVGZvVFRkb3Nhd3o5S293UE0yeXZn Edited June 4, 2017 by mainstreet Quote Link to comment Share on other sites More sharing options...
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