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orac69 |
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orac69 Derestricted Danger
Joined: 07 Mar 2013 Karma :
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Posted: 15:48 - 15 Nov 2013 Post subject: Derbi Senda 50cc wont start - has fuel, spark, compression |
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Hi guys,
Im a bit stumped - could do with some advice please. Searched for hours, still not sure what to do..
My son has a 2006 Senda X-Race 50cc. Its got a pipe, derestricted, changed jet, needle, sprocket etc. and its been running perfectly.
On his way home it just died. Cant kick start it, cant bump start it - there is no even attempt at firing up.
Ive checked / changed the plug - its got a nice strong blue/white spark - which would rule our the CDI / HT / electrics?
There is fuel getting through Im pretty sure - had the carb off, float wasnt stuck, all pipes look good and tight, had a blow through.
There is compression - a good thud when putting a finger on the plug hole..
The fuse is good.
Battery voltage was a little low @ 12.5v, so ive put that on charge - but I thought the Senda should start without a good battery on a bump..
Actually I didnt check the main jet for blockage - but shouldnt be - its only done about 500 miles since re-jetting.
advice appreciated, thanks. |
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bikenut |
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bikenut World Chat Champion
Joined: 21 Nov 2011 Karma :
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bladerunner |
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bladerunner World Chat Champion
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orac69 |
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orac69 Derestricted Danger
Joined: 07 Mar 2013 Karma :
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Posted: 17:50 - 15 Nov 2013 Post subject: |
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Thanks - dont know anything about and have never changed or inspected a flywheel - will try the petrol down the hole first and report back |
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orac69 |
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orac69 Derestricted Danger
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reed |
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reed Nearly there...
Joined: 28 Oct 2012 Karma :
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Posted: 18:52 - 15 Nov 2013 Post subject: |
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I had this issue with my brothers 50cc bike, turned out to be bad fuel, if it runs with the fuel from the tank put directly 'down the hole' then it may still be bad fuel, as I found, eventually.
Confused me for a while, as it started and ran for a second or two when fuel was placed directly into the head, I think there must have been water sitting at the bottom of the tank. ____________________ Generic XOR 50, Gilera SMT 50, GSXR 400 GK73A, Ducati Monster 600, Honda Hornet 600.
Sold. Stolen. Written off. Sold. Current. |
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orac69 |
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orac69 Derestricted Danger
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bikenut |
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bikenut World Chat Champion
Joined: 21 Nov 2011 Karma :
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Posted: 11:40 - 16 Nov 2013 Post subject: non start |
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so, good sparks, fresh fuel down the plug hole and still no sign..........pics needed for timijng marks but........
with plug out, and piston seen to rise to tdc ish, does mark appear close to a reference mark on the engine??
if its close then may be ok, by close i mean within a few mm, ign fire point usually a few degrees before tdc max piston movement upwards.
if the marks are way out then suspect flywheel key ( woodruff ).
if flywheel nut removed you can probably see the key "slot" which probably lines up with tdc, pointing up in line with the cylinder.........
pic would help.
it could also be a blocked esxhaust but check the key first.
if the key has sheaered, then flywheel will move relative to the crank and end up at any position, even the correct one for an instant.
pics pics pics......... ____________________ nuts about bikes |
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_Iain_ |
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_Iain_ Banned
Joined: 01 Feb 2012 Karma :
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Posted: 13:07 - 16 Nov 2013 Post subject: |
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+1 on the woodruff key.
Have seen a trials bike do this & caused myself and Paddy many hours of headaches searching for the issue. ____________________ Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340 |
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bikenut |
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bikenut World Chat Champion
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P. |
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P. Red Rocket
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orac69 |
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orac69 Derestricted Danger
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P. |
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P. Red Rocket
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orac69 |
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orac69 Derestricted Danger
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- Super Spammer
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bikenut |
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bikenut World Chat Champion
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orac69 |
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orac69 Derestricted Danger
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Old Thread Alert!
The last post was made 10 years, 150 days ago. Instead of replying here, would creating a new thread be more useful? |
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