asquaddie Posted November 3, 2016 Share Posted November 3, 2016 Guys I'm guessing that even with a pull start motor (Moster+) when you place the spark plug on the cylinder head and pull the starter cable - there should be sparking!!!! Tony Quote Link to comment Share on other sites More sharing options...
ptwizz Posted November 3, 2016 Share Posted November 3, 2016 Yes, you are correct. But... just resting the plug on the head might be producing a spark somewhere other than the plug gap. You really need the plug held firmly against the head (so the movement of turning the engine doesn't bounce it off at the moment when the spark should happen). The HT lead and plug cap should be away from the head - a tiny puncture in the rubber can allow the HT charge to spark from the lead to the head, often where you can't see it. Personally, I simply hold the plug in place with my hand. Yes, I've had a few minor shocks from doing this, but at low speed the HT output is low and the shock is no more than a sudden tingle. 1 Quote Link to comment Share on other sites More sharing options...
asquaddie Posted November 3, 2016 Author Share Posted November 3, 2016 OK, I was in my garage with the lights off and I bungee'd the plug on the head. So I guess, if there were a spark I would see it somewhere. I presume the HT lead was touching the head, but the motor is new with only 10 hours on it!!! It there is no spark then??? what else do you think it might be? Many thanks in advance. Afternote: It is a shame that no one can run a 2 stoke (PPG) mechanic type course. I am sure there are other guys out here with no idea about engines and would love to learn!! Tony Quote Link to comment Share on other sites More sharing options...
cas_whitmore Posted November 3, 2016 Share Posted November 3, 2016 Was it running ok from your last flight . I've had plugs give up even though engine run ok from last flight . Also had kill swich wire earth out on throttle cable outer metal snake thingy . Quote Link to comment Share on other sites More sharing options...
Dariuszk24 Posted November 3, 2016 Share Posted November 3, 2016 Do you have problem,or just make experiments? ?? Moster 185 plus have most of the body Anodized black (cylinder head,carter)or silver (cylinder block) Anodized surface are electric insulator To test spark plug like posts above you need to find clean not painted(not anodized) piece of surface or zink coated bolt Quote Link to comment Share on other sites More sharing options...
Steve Posted November 3, 2016 Share Posted November 3, 2016 I've had several plugs just stop working between flights, no idea why but a new plug fixed it each time. I bought one of these to narrow it down to the plug: https://www.amazon.co.uk/gp/product/B00157O4YK/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1 1 Quote Link to comment Share on other sites More sharing options...
asquaddie Posted November 3, 2016 Author Share Posted November 3, 2016 Cheers Steve - Just ordered one. Had an engine out - motor just stopped dead at 600ft after 4 minutes flying. It was my first flight of the day and I did a GOOD 3 minute warm up with the engine, it was on full throttle for at least 15 seconds at the end. Motor is a new (10hr) moster plus Now, not able to start at all. I can see fuel up to the carb and it seems to pull OK. Any idea Tony Quote Link to comment Share on other sites More sharing options...
Dariuszk24 Posted November 4, 2016 Share Posted November 4, 2016 Sometimes very rich mixture especialy in break-in engine ,shorting lifespan spark plug 1 Get new spark plug -chipest way Best plugs are NGK B9ES do not use BR9ES unless you don have resisor in the cap-you not need double resistor (cap resistor+spark plug resistor = poor spark I have like others sytuation where plug gone for unknown reasons.new nearly always help. 2 check wires ,especialy under kill switch in your throtle handle,and connection with ignition coil- sometimes wire cracking and make direct connection with body 3 very rare sometimes sparkplug cap can gone ,most of manufactures fit in there resistor ,can fail 4 coil pack fail ? 1 Quote Link to comment Share on other sites More sharing options...
Hayneflyer Posted November 4, 2016 Share Posted November 4, 2016 RE thee two stroke mechanics course I agree! I know almost nothing about the engines, sorry to say, and would love to learn even if its only used in a frustrating 'engine won't start' in the field moment - not that thats ever happened as Mini Planes Top80 is a fantastic starter! 2 Quote Link to comment Share on other sites More sharing options...
Steve Posted November 4, 2016 Share Posted November 4, 2016 11 hours ago, asquaddie said: Cheers Steve - Just ordered one. Had an engine out - motor just stopped dead at 600ft after 4 minutes flying. It was my first flight of the day and I did a GOOD 3 minute warm up with the engine, it was on full throttle for at least 15 seconds at the end. Motor is a new (10hr) moster plus Now, not able to start at all. I can see fuel up to the carb and it seems to pull OK. Any idea Tony Has to be a process of elimination, of course. Blocked carb or check for spark, of course. All the bleedin' obvious tedium, of course! Have you tried a fresh plug (which you have, of course ...)? Quote Link to comment Share on other sites More sharing options...
asquaddie Posted November 6, 2016 Author Share Posted November 6, 2016 I've been in Derbyshire for the week now, so unable to do anything with the motor. I have purchased a new plug B9RES (same type os the original one) also the spark plug checker which Steve mentioned. So when I get back next Monday I'll try them both. If not it will be a call to Parajet I guess Just hoping there is no internal damage now..... Tony Quote Link to comment Share on other sites More sharing options...
admin (Simon W) Posted November 6, 2016 Share Posted November 6, 2016 when I used to drag race motorbikes, out of box of 20 plugs (5 sets) at least 1 would be DOA and another 1 or 2 from the same box would fail early. SW Quote Link to comment Share on other sites More sharing options...
asquaddie Posted November 6, 2016 Author Share Posted November 6, 2016 It was strange, because when Clive handed the motor over to me (new) the plug wasl used!!!! To be honest, I'm not even sure it is the plug yet, because I brought a new plug straight away and tried it and I still did not see a spark. I will use the 'spark tester' first when I get home and go from there. It still gave me a bit of a shock, because I did not expect my motor to stop in mid-air so soon. Not a problem thou, because my old motor done this and I ran out of fuel a few times, so emergency landing around my area was not a problem. Just a shock Tony Quote Link to comment Share on other sites More sharing options...
admin (Simon W) Posted November 6, 2016 Share Posted November 6, 2016 That's not strange mate they test your plug for the reasons I mention above hopefuly it is just that. SW Quote Link to comment Share on other sites More sharing options...
Steve Posted November 7, 2016 Share Posted November 7, 2016 18 hours ago, asquaddie said: ... and I ran out of fuel a few times, so emergency landing around my area was not a problem. Nutter. How many times? There's this screw-off thing on top of that plastic boxy thing, you put fuel in there. Quote Link to comment Share on other sites More sharing options...
cas_whitmore Posted November 7, 2016 Share Posted November 7, 2016 Tony ' there is another way of seeing if you have any power to you plug . If there is power to it' you'll get a loud sound echoing around you , could be mistaken for swear words . All you do is put you finger in the plug cap . cas , Quote Link to comment Share on other sites More sharing options...
Dariuszk24 Posted November 7, 2016 Share Posted November 7, 2016 Side effect of that is working better than viagra ????? Quote Link to comment Share on other sites More sharing options...
asquaddie Posted November 7, 2016 Author Share Posted November 7, 2016 Thanks Cas If the new one works I will be laughing, but if it doesn't then I might just use your way Quote Link to comment Share on other sites More sharing options...
Guest Posted November 8, 2016 Share Posted November 8, 2016 Asquaddie hi there i have had this problem before on a moster 185 with 13 hours on. Mine was initially pointing to be faulty kill switch wiring however by the sounds of it if you don'5 have the spark plug issue it could be a Ht Lead or cap replacement. Hope it gets fixed soon Quote Link to comment Share on other sites More sharing options...
asquaddie Posted November 9, 2016 Author Share Posted November 9, 2016 Thanks Danny. As above, when I get home I'll try the spark tester and contact Parajet for their advice. I don't think no-one has a bad word against the after service (I haven't) and I don't think it will change I let you all know next week. Tony Quote Link to comment Share on other sites More sharing options...
cas_whitmore Posted November 9, 2016 Share Posted November 9, 2016 We can't wait that long Tony ' we need answers. ? Cas , Quote Link to comment Share on other sites More sharing options...
asquaddie Posted November 23, 2016 Author Share Posted November 23, 2016 Just a quick update. After discussions with the Parajet team they think it is a faulty CDI unit. So that's on its way. They also send some photos and instructions to replace the new one. I asked them, if they are short on technical mechanics in the work shop I'll be happy to stand in for them. John said he'll pass my name to HR Tony Quote Link to comment Share on other sites More sharing options...
cas_whitmore Posted November 23, 2016 Share Posted November 23, 2016 Hi Tony while your waiting for parts . See if you can un screw the plug cap from the ht lead hold end of it near a bolt head pull the starter cord . Not sure you might have a resistor cap fitted try it . Cas . Quote Link to comment Share on other sites More sharing options...
asquaddie Posted November 23, 2016 Author Share Posted November 23, 2016 8 minutes ago, cas_whitmore said: Hi Tony while your waiting for parts . See if you can un screw the plug cap from the ht lead hold end of it near a bolt head pull the starter cord . Not sure you might have a resistor cap fitted try it . Cas . Not sure what you mean - I do have a resistor cap fitted. My safe option is wait until the part arrives and following the detailed instructions (with pictures) for the replacement. Must repeat again - excellent service from Parajet Obviously, 'My' best option would of been Parajet picks up the motor fixes it and returns it, because it is still under warranty. But the best practical way is Parajet sends me the part with detailed instructions and I learn how to replace it myself, and if I get any problems I phone them and they talked me through it. If I get major problems 'My best option' above comes into play. This is why we need to run small courses on all PMC fly-ins. Which will give the newbies confidence to check and repair their motors. Tony Quote Link to comment Share on other sites More sharing options...
cas_whitmore Posted November 23, 2016 Share Posted November 23, 2016 Ok Tony'did try sending a pic . probly best to wait for parts ' keep us posted . cas . Quote Link to comment Share on other sites More sharing options...
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