legoluke.11 Posted January 26, 2018 Share Posted January 26, 2018 My Mach 28 has been giving me trouble for a long time now. It just won’t hold a tune and when it idles it is very erratic revving up and down randomly. I’m not new to the hobby so all the tuning on the engine is right I’ve spent days tuning it so it’s not that issue. I’ve replaced the head gaskets and it still doesn’t work. There’s some smoke coming from the head of the engine as well. The only thing I haven’t tried is a new glow plug but I doubt that will be the issue will it? Thanks all help is greatly appreciated! Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Oh How Original Posted January 26, 2018 Share Posted January 26, 2018 Is it in a Hyper 7 by any chance? If so, bin it and buy the 21 lol, sorry to sound harsh but the Maxh 28 is turd! 1 Quote Link to comment Share on other sites More sharing options...
kenny_st Posted January 26, 2018 Share Posted January 26, 2018 air leak of some sort, or I had the same sort of symptoms and ended up as a faulty carb 2 Quote Link to comment Share on other sites More sharing options...
legoluke.11 Posted January 26, 2018 Author Share Posted January 26, 2018 Is it in a Hyper 7 by any chance? If so, bin it and buy the 21 lol, sorry to sound harsh but the Maxh 28 is turd!Yep in hyper 7, am seriously considering an electric conversion [emoji23]Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
legoluke.11 Posted January 26, 2018 Author Share Posted January 26, 2018 air leak of some sort, or I had the same sort of symptoms and ended up as a faulty carb How do I find out if it’s the carb that’s faulty then?Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Oh How Original Posted January 26, 2018 Share Posted January 26, 2018 35 minutes ago, legoluke.11 said: Yep in hyper 7, am seriously considering an electric conversion Sent from my iPhone using Tapatalk That would be the best option... Failing that, the 21 version is so much better, the Mach 28 is an absolute crapper. Quote Link to comment Share on other sites More sharing options...
kenny_st Posted January 26, 2018 Share Posted January 26, 2018 1 hour ago, legoluke.11 said: How do I find out if it’s the carb that’s faulty then? Sent from my iPhone using Tapatalk was the last thing I checked, new carb and job done Quote Link to comment Share on other sites More sharing options...
evssv Posted January 26, 2018 Share Posted January 26, 2018 yep..u want the .21 3 port engine....sweet they r Quote Link to comment Share on other sites More sharing options...
Moonwolf Posted February 14, 2018 Share Posted February 14, 2018 I used to have the same problem, but I cured it with some ptf tape. If you look down at the engine, the screw on the left will be too loose and that's why you lose the tune. Just unscrew it and wrap a small amount of ptf tape around it and replace. I never had a problem after that Quote Link to comment Share on other sites More sharing options...
atom3624 Posted February 25, 2018 Share Posted February 25, 2018 Mach .28's a fantastic motor, or was as a spare for my Raminator when it was nitro. Never heard negative press for it other than it runs hot. I preferred my LRP motors when I ran it nitro, but was always surprised when I put the 'copperhead' Mach .28 in it! Bit of a surprise that. Al. Quote Link to comment Share on other sites More sharing options...
WiLLiE Posted February 25, 2018 Share Posted February 25, 2018 4 hours ago, atom3624 said: Mach .28's a fantastic motor, or was as a spare for my Raminator when it was nitro. Never heard negative press for it other than it runs hot. I preferred my LRP motors when I ran it nitro, but was always surprised when I put the 'copperhead' Mach .28 in it! Bit of a surprise that. Al. Yes I will second that , have a Mach 28 and always been good , kept a good tune . Quote Link to comment Share on other sites More sharing options...
Fly In My Soup Posted February 27, 2018 Share Posted February 27, 2018 I used a mach 28 with a turbo head, more smoke than an Amsterdam cafe, loud as anything ! It pulled like a freight train though, great fun Quote Link to comment Share on other sites More sharing options...
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