Bob Moore Posted May 15, 2017 Share Posted May 15, 2017 (edited) Advice wanted please! Getting desperate for ideas to sort this Solo 210 I acquired a couple of months back, which had been unused for 20 years, sat in someones garage. (You may have seen my original posts asking for parts advice etc. It arrived minus the coil.) Been paragliding 15+ years and looking to get into power flying. I couldn't source the original coil anymore but 2nd coil I fitted a Stihl chainsaw coil that went in ok with a bit of fiddling and I had a spark. This is a magneto coil, ie no points, no battery necessary. I cleaned the fuel tank, did some rewiring, new fuel pipes, fuel filter, serviced the carb with new parts (done in twice now) . Woo hoo it started. I've had the 4 bladed prop off, rubbed it down , re-varnished, balanced it too! Super, it starts and runs well when started cold, and runs beautifully , picks up well, revs well. BUT, stop it and leave it for 10 mins and it won't start on the button. It's electric start. You can crank it forever but fuel is not getting into the pot. Drop a bit of petrol into the spark plug hole it will fire run again OK. I have tested crankcase pressure, good. When you are cranking it the crankcase pressure driven fuel pump that is part of the carb is pumping fuel. Carb is clean, jets are clean, I've dismantled it several times now and blown it with my airline. And anyhow, when running it runs beautifully. Pop off pressure I thought, this is the bit that opens the fuel metering diaphram and allows fuel in. Yesterday I replaced the fuel metering spring. £3. This can have an effect on running if it's weak. It started OK this morning revved up OK. Ran it 10 mins and stopped it . Went back ten mins later and cranked it with the electric start, wouldn't start. Dropped a bit of fuel down the decompressor vacuum tube which goes straight into the carb inlet manifold. (Incidentally I have had the decompressor off too and checked it!) Started no trouble. (Sorry this becoming an essay but I have been working on this reluctance to start when hot prob for weeks now.) I checked Pop off pressure with my home made device seems to be 12 lbs per square inch which should be OK and this runs beautifully anyway? The video is it running after my latest change, ie metering spring. I intend to train on this machine when I 'm happy with it, but I would like a motor that will restart when I'm in the air so that I can shut down and restart. A new carb is £81 Warbro WB32. Some people have successfully used WB 37. I am reluctant to shell out £81 and find the problem still exists and in any case, I find it hard to believe there is anything fundamentally wrong with the carb. It's a lump of metal with a few holes drilled in it and some diaphrams. It's cost me £160 to get this running OK (I got it for free.) £81 if it worked would still be a cheap motor. SO, please has anyone else got any other ideas as I think I've covered all bases. (And please don't say buy a new £3000 - £4000 xyz motor!) I am considering making a secondary priming device that I can operate while in the air which will inject a little fuel into the inlet manifold via the decompressor tube. That would be a fiddle but should work. https://www.youtube.com/watch?v=afx1ZrdxvHY&index=1&list=PLLdle7NDE_1ZJPsIze-5j_ATXkyc_j2uj Edited May 15, 2017 by Bob Moore Quote Link to comment Share on other sites More sharing options...
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