tomarnold Posted April 17, 2017 Share Posted April 17, 2017 On the advice of several people I spoke to, I fitted a decompressor valve to my solo 210 motor. It certainly pulls over more easily with it, but I find that it almost never starts with the decompressor open. If I close the valve (i.e. pull it up), the motor is harder to pull but fires every time: if I open the valve by depressing the button, the motor is much easier to turn over by hand but it doesn't fire. Any thoughts? Quote Link to comment Share on other sites More sharing options...
kiwi k Posted April 17, 2017 Share Posted April 17, 2017 My Solo 210 never had a decomp valve but electric start only and NO problems starting at all. Have you checked coil gap ? Quote Link to comment Share on other sites More sharing options...
tomarnold Posted April 17, 2017 Author Share Posted April 17, 2017 Yes, coil gap is correct. The motor starts absolutely fine without the decompresser valve, but it won't start with the valve activated. Quote Link to comment Share on other sites More sharing options...
cas_whitmore Posted April 17, 2017 Share Posted April 17, 2017 Do you think it could be sucking air on the intake stroke back through, instead of the carb . Just a guess. cas . Quote Link to comment Share on other sites More sharing options...
AndyB Posted April 17, 2017 Share Posted April 17, 2017 I had an engine with decomp valve. It was NOT supposed to start with the valve open. The valve was only to aid spinning up of the motor. So it started like this.... open valve, pull starter and then just before starter gets to end of travel, close valve and away it went. Usually the modern ones are designed so that they self close as soon as the first combustion happens. Quote Link to comment Share on other sites More sharing options...
tomarnold Posted April 17, 2017 Author Share Posted April 17, 2017 Hmm, mine is a modern type, so it does self-close when the engine starts, but the weird thing is that the engine doesn't start well if the decompression valve is open but starts fine with a hard pull with the valve closed. Quote Link to comment Share on other sites More sharing options...
cas_whitmore Posted April 17, 2017 Share Posted April 17, 2017 You don't even get a "pop" out of it . If you do does that shut the valve . Quote Link to comment Share on other sites More sharing options...
Dariuszk24 Posted April 18, 2017 Share Posted April 18, 2017 Sili question solo210 has originally decompression hole connecting combustion chamber with exhaust port. Do you close this hole by some threaded blanking plug??? Quote Link to comment Share on other sites More sharing options...
tomarnold Posted April 18, 2017 Author Share Posted April 18, 2017 Ah, maybe that's the problem - the decompression hole is there and i recently unblocked it so perhaps having the decompression valve as well means that there is not enough compression for it to start. Quote Link to comment Share on other sites More sharing options...
cas_whitmore Posted April 18, 2017 Share Posted April 18, 2017 Love it when you don't get the full story Quote Link to comment Share on other sites More sharing options...
tomarnold Posted April 18, 2017 Author Share Posted April 18, 2017 Thank you all for your replies. Annoyingly now I have broken the starter mechanism with all of this pulling! So I have ordered new parts from Fresh Breeze. So do you think that having the decompression hole (built-in as standard on the Solo 210) and the decompression valve would cause the problem? If so, perhaps it would be a good idea to blank off that hole somehow so that I have the option of using the decompression valve on its own? Quote Link to comment Share on other sites More sharing options...
Dariuszk24 Posted April 18, 2017 Share Posted April 18, 2017 (edited) 100% now Im sure Take off cylinder head and you can see over exhaust port small hole with alen key hole plug Turn this out,take M6x1 tapper .make thread nearly up to exhaust port (not thrue-very important,if you do than plug can fell in to exhaust) and put new blankig plug slightly longer then old. Im afraid you need to take off exhaust to protect and prevent metal flakes get under piston. Thats it Edited April 18, 2017 by Dariuszk24 Quote Link to comment Share on other sites More sharing options...
tomarnold Posted April 18, 2017 Author Share Posted April 18, 2017 (edited) Thanks, that's really helpful. Edited April 18, 2017 by tomarnold Quote Link to comment Share on other sites More sharing options...
kiwi k Posted April 18, 2017 Share Posted April 18, 2017 Why not just remove the decompression valve you fitted and blank that off , lot easier than messing about with the cylinder sidewall Quote Link to comment Share on other sites More sharing options...
tomarnold Posted April 18, 2017 Author Share Posted April 18, 2017 Yep, you're probably right, i just don't fancy undoing the work i did when i put the decompression valve in 2 weeks ago! Ah well, I'll just carry on with the valve closed. Just got to fix the starter now... Quote Link to comment Share on other sites More sharing options...
Dariuszk24 Posted April 18, 2017 Share Posted April 18, 2017 Head up After close decompression hole you get much,much more compression than before,Im preaty sure you not turn crank shaft by hand? Quote Link to comment Share on other sites More sharing options...
Hikinghome Posted April 18, 2017 Share Posted April 18, 2017 (edited) Hi I have a solo 210 and want to fit a decompression valve Can I ask where you got yours from ? Edited April 18, 2017 by Hikinghome Quote Link to comment Share on other sites More sharing options...
Hikinghome Posted April 18, 2017 Share Posted April 18, 2017 Hi I have a solo 210 and want to fit a decompression valve Can I ask where you got yours from ? Quote Link to comment Share on other sites More sharing options...
tomarnold Posted April 18, 2017 Author Share Posted April 18, 2017 I got it from my local lawnmower repair shop here in Sweden. However, without blocking up the decompression hole or is not much use as the engine won't start with the valve open! Quote Link to comment Share on other sites More sharing options...
kiwi k Posted April 18, 2017 Share Posted April 18, 2017 21 minutes ago, Hikinghome said: Hi I have a solo 210 and want to fit a decompression valve Can I ask where you got yours from ? They have an internal decompression port, why wanting to fit a valve? read above you'll possibly get problems, plus if you haven't your port may need drilling thru to clean it out. Quote Link to comment Share on other sites More sharing options...
Dariuszk24 Posted April 18, 2017 Share Posted April 18, 2017 Internal decompression port its good,but you pay for this big price in lower power output.most of the new motors like for example moster use that up today? Engine like solo 210 its immortal if you take care,and has ability to properly tuning. Just thanks to close decompresion you can get 3-4BHP more,unbelievable? Its true,you want more power-slighty speed up ignition angle+properly tuned carburetor ? Quote Link to comment Share on other sites More sharing options...
tomarnold Posted April 19, 2017 Author Share Posted April 19, 2017 17 hours ago, Dariuszk24 said: Internal decompression port its good,but you pay for this big price in lower power output.most of the new motors like for example moster use that up today? Engine like solo 210 its immortal if you take care,and has ability to properly tuning. Just thanks to close decompresion you can get 3-4BHP more,unbelievable? Its true,you want more power-slighty speed up ignition angle+properly tuned carburetor ? So do you think by closing the internal decompression port and using the decompression valve instead I could get a few more horsepower eh? Now that does sound worthwhile... 1 Quote Link to comment Share on other sites More sharing options...
kiwi k Posted April 19, 2017 Share Posted April 19, 2017 Darius if you want more performance sharpen the port angles plus smooth the surfaces a little and mill the head down but it becomes borderline on starting, its just basic 2 stroke tuning. Quote Link to comment Share on other sites More sharing options...
Dariuszk24 Posted April 21, 2017 Share Posted April 21, 2017 (edited) And you forgotten to add one think You use 500cc on your back when take off ,and kick start this motor without decompressor with string leg shackle pullstart when you stand up ? But when you flying on trike you can put as many scrap as you like because you not carry any waight on your back.and you really dont care about fire up motor in comfortably position. Edited April 21, 2017 by Dariuszk24 Quote Link to comment Share on other sites More sharing options...
tomarnold Posted April 21, 2017 Author Share Posted April 21, 2017 Ah i see, you don't fly, that explains your lack of understanding. No offence meant, i just mean to say that starting a motorbike is very different to pull-starting a motor on your back. I had an XS650 which was kick-start only, and heaving that over was just a case of standing on the kick-starter and putting all of my 70kg into it. But that is completely different to putting a hand up to your shoulder and pulling a rope attached to a rather flimsy plastic starter mechanism, hence the need for some sort of decompression valve to avoid breaking the starter mechanism as much as actually overcoming the compression to start it. Quote Link to comment Share on other sites More sharing options...
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