Full Version: New Dnepr Owner, New Problems!
Just bought a used Dnepr MT-11 kit bike this weekend. The previous owner said he went through it down to the crankshaft and seemed to do a thorough job. However, after a good run in the snow this weekend, I'm now running on only one cylinder and can't get the thing started again. I'll be going through the bike step-by-step as I organize the proper trouble-shooting sequences. The bike does have an electronic ignition and the plug wires look good. I'm thinking it's an electrical issue, but who knows. I have an old BMW /2 and was cautioned about pulling a plug wire off while the engine was running, as this could blow the (expensive) coil. Any worries on this re. the Dnepr? Although I'm currently broken down, I look forward to owning this bike and tinkering with it over the coming months. It looks like there are some good resources on the web. I have a feeling that the bike will teach me some new skills, one of them being patience, and to not venture too far from home; at least until I get some of the mechanical issues sorted. Wish me luck...
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I have an old BMW /2 and was cautioned about pulling a plug wire off while the engine was running, as this could blow the (expensive) coil. Any worries on this re. the Dnepr?
Not really as long as there's tabs for the 3/8" to 1/2" safety gap on the coil.
If there is any reason that a cylinder isn't firing (plug wire off, low compression, open valve, bad plug, bad plug wire, bad plug cap, etc.) you'll get a big fat spark across the gap to ground. It's a great diagnostic tool as well.
Click to view attachment
There's a gap on the black coil, too. Its just hard to see.
Click to view attachment
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I'll be going through the bike step-by-step as I organize the proper trouble-shooting sequences.
Everything you need to gap the valves, set the idle and balance the carbs is here...
http://sites.google.com/site/foilheadz/maintenance
Don't pull the plug lead if you have an electronic ignition - my understanding is that it can fry it.
Take the plugs out and leave them connected to the wires, kick her over and see if there's a spark.
You might have water in your carbs from the snow or something.
Dub
Take the plugs out and leave them connected to the wires, kick her over and see if there's a spark.
You might have water in your carbs from the snow or something.
Dub
Check as Kenn Ulrich best says: compression-ignition-carburation. Take the plugs out, put yer fingers on the holes and kick the pedal.
If you have over 10 V in the battery check that the plugs have a spark, which should be big enough. If in doubt you can check them by getting yourself zapped.
It might happen that the double coil only supplies enough current to one of the cyllinders. Anyway using a 14 wrench take the front casing off and check that the ingition is well secured and not rotating slightly.
If ok, take the bowls out of the carbs and check how much water you've got inside. Drain and clean. IF there's water in the carbs, there is water in the fuel tap bowl, also drain and clean that.
FOr the future get a spare points ignition from Ukrainian sources , I would recommend the user Echocg on this forum. While you are at it buy everything small and cheap that can break down. You can look at Dnepr spares on sites like: oldtimergarage and ural-zentrale. Original old stuff worked best, and the Dnepr is a good, sturdy and reliable machine.
Plugs like NGK BP7HS are a bit too cold for winter, get ones with lower thermal number (NGK BP7HS have 270, the closest one would be a 240).
If temps are low, run a less viscous oil, a 15W40.
the starting procedure involves overflowing the carbs via the push-buttons ---> 3-4 kicks engine OFF and NO pulling the gas grip (with chocke pulled 1 nodge if winter) -this is for priming --->
1-2 kicks WITH contact on, gas grip just a tad pulled if it doesn't start, repeat, don't kick uselessly with contact on.
If you have over 10 V in the battery check that the plugs have a spark, which should be big enough. If in doubt you can check them by getting yourself zapped.
It might happen that the double coil only supplies enough current to one of the cyllinders. Anyway using a 14 wrench take the front casing off and check that the ingition is well secured and not rotating slightly.
If ok, take the bowls out of the carbs and check how much water you've got inside. Drain and clean. IF there's water in the carbs, there is water in the fuel tap bowl, also drain and clean that.
FOr the future get a spare points ignition from Ukrainian sources , I would recommend the user Echocg on this forum. While you are at it buy everything small and cheap that can break down. You can look at Dnepr spares on sites like: oldtimergarage and ural-zentrale. Original old stuff worked best, and the Dnepr is a good, sturdy and reliable machine.
Plugs like NGK BP7HS are a bit too cold for winter, get ones with lower thermal number (NGK BP7HS have 270, the closest one would be a 240).
If temps are low, run a less viscous oil, a 15W40.
the starting procedure involves overflowing the carbs via the push-buttons ---> 3-4 kicks engine OFF and NO pulling the gas grip (with chocke pulled 1 nodge if winter) -this is for priming --->
1-2 kicks WITH contact on, gas grip just a tad pulled if it doesn't start, repeat, don't kick uselessly with contact on.
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