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triggs1968
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Joined: 03 Aug 2010
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PostPosted: 19:44 - 03 Aug 2010    Post subject: DT 50MX Reply with quote
Hi all, my son has got a 1986 DT 50 MX. He was out for a spin when the engine started loosing power and died on him, he noticed that he had no 2 stroke oil left in the tank(numpty) and pushed the bike home. I have had a look at it topped up with oil, bled it through but the bike wont start. Looking on futher got a good spark from the plug but after kicking for a while there seems to be no fuel going to the engine. I have stripped the carb and reassembled it. No blockages and fuel runs into it ok. Tried to bump it and still the plug is dry. Any help would be great. Thanks
Dave. Yes he is a plonker
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27cows
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Joined: 01 Nov 2009
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PostPosted: 07:30 - 04 Aug 2010    Post subject: Reply with quote
Will almost certainly have done some damage to the piston and bore, though that doesn't explain why fuel isn't getting through.
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triggs1968
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PostPosted: 07:59 - 04 Aug 2010    Post subject: Reply with quote
Thanks, do you recommend stripping the engine or is there anything else i can try first?
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Ichy
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Joined: 15 Jul 2005
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PostPosted: 08:13 - 04 Aug 2010    Post subject: Reply with quote
27cows wrote:
Will almost certainly have done some damage to the piston and bore, though that doesn't explain why fuel isn't getting through.


Would that not be because the rings might be busted, therefore no vacuum to draw fuel through the reed valves?
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Ichy
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Joined: 15 Jul 2005
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PostPosted: 08:18 - 04 Aug 2010    Post subject: Reply with quote
triggs1968 wrote:
Thanks, do you recommend stripping the engine or is there anything else i can try first?


You need to remove the barrel to take a good look for any damage. Shouldn't be much work, remove the exhaust and sparkplug, then 4 nuts on the top of the cylinder head. Lift the barrel up slowly and when there is enough room stuff some rags in the hole in the crankcase, just in case. Only then should you lift the barrel completely free of the piston.

Just be aware that if the rings have broken that they may have fallen into the crankcase.
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27cows
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PostPosted: 12:13 - 04 Aug 2010    Post subject: Reply with quote
Marki wrote:
27cows wrote:
Will almost certainly have done some damage to the piston and bore, though that doesn't explain why fuel isn't getting through.


Would that not be because the rings might be busted, therefore no vacuum to draw fuel through the reed valves?


Could be. Though if the rings had broken, you would have expected a seizure.

Top end definitely needs to come off to assess damage. It might be possible to get away with a careful clean up of the piston and bore surface with emery cloth/wet & dry paper. Happened to me once on my RXS100 and the motor survived. Top end went on to do about 20,000 more miles Laughing
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Robby
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Joined: 16 May 2002
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PostPosted: 13:16 - 04 Aug 2010    Post subject: Reply with quote
As said, strip it and see. The good thing is that's an extremely simple engine to work on, and parts are cheap.
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triggs1968
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Joined: 03 Aug 2010
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PostPosted: 18:44 - 04 Aug 2010    Post subject: Reply with quote
Thanks everyone for the help. He has melted the piston rings to the piston so buying a new top en kit.
Thanks again
Dave.
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27cows
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PostPosted: 05:50 - 05 Aug 2010    Post subject: Reply with quote
This is why it's always a good idea to have a nice simple engine, particularly in your early days on the road Wink
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Old Thread Alert!

The last post was made 15 years, 203 days ago. Instead of replying here, would creating a new thread be more useful?
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