Yamaha DT175 fireing

My Motorcycle started to fire. I think its something to do with the electric
system. I wonder if it could be the ignition coil or the rectifire or maybe
the CDI. The spark is totaly unreliable and its hard for me to keep the
engine going.

 

What calibre? 20mm or 40mm depleted uranium?

 

How does your spark plug look? What about your spark plug wire?
Solid-state electronics typically either work, or don't, so intermittent
running is more often bad connections, cracked wire insulation, or a
failing coil, if it's electronic at all.

Did this problem develop gradually or all at once? Had you done any
other work on the bike shortly before this happened? The more details
you can give, the easier it is to help you out.

--
Later,
John



'indiana' is a 'nolnn' and 'hoosier' is a 'solkk'. Indiana doesn't solkk.

 

It fires 25 mm torpedos out from the exhasust hehe..
No what i meant was that it runs roughly

"The Older Gentleman" <> skrev i en
meddelelse

 

Thank you for the answer.

It happend all at once. But it seems like sometimes if im disconnecting and
connecting the wires then it works again. But last time i did it then it
only got worse, i tried to test the rectifire with an ohmmeter, the
rectifire has no connection at all, like a damaged connection was there. if
the rectifire would be destroyed could the bike do what i described?
The spark plug looks as it should i assume, its brownish.

The spark plug doesn't give sparks... but then again it must give some
sparks because i can sometimes manage to start the engine, the engine
starts about (1/4) of the times i kick the kickstarter .

I assume it doesn't give sparks every cycle that its required to do. Also if
ive been trying hard to start it and it has been unsuccessfull then a
explosion can ocour. I think its because there is alot of gas that hasn't
been combusted.

If im so lucky to start then its very unrelayable. it can stop any second!
if i hear that the engine is about to halt then i turn the throttle
carefully then 2 seconds after then it suddently goes to top rev/min.

I can also experienvce that if im turning the throttle then it kinds of
"strangles" the engine. The revs get lover if it gets some gas.

Hope that was more detailed!

 

Do you have the manual for your bike? Do you know how to properly test
your bike's rectifier? If the rectifier uses a diode bridge (and as I
understand things, most do), then your meter must apply voltage to
polarize the diode, otherwise absolutely nothing (useful) happens.

I'd actually be looking for a connector that's corroded or loose, or
possibly damaged wiring. You should inspect, disassemble, clean, and
reassemble every connector in the ignition system just to be sure things
are solid there, before going on to worry about replacing parts.

How's the gap on the plug?

These last two paragraphs are more symptomatic of plugged up carburetors
than electrical problems. Has your bike sat unused but full of fuel for
a long time? In any case, I recommend running a fuel system cleaner
through the machine (sorry, I don't know what's available over there),
according to directions. It might help and won't hurt (if you follow
directions).


Overall, it does seem like there's an electrical problem, but what it is
will require more investigation. Be systematic about this (e.g. check
connections and wire condition, check the spark plug gap or just replace
the plug, check spark plug wire condition, and only afterwards even
consider replacing parts). Oh yeah, if your bike has a battery, how old
is it?

--
Later,
John



'indiana' is a 'nolnn' and 'hoosier' is a 'solkk'. Indiana doesn't solkk.

 

A bad ground; or a bad spark plug wire/coil (or wire/cap)
connections are the most likely culprits, and the easiest and cheapest
to fix.

Also, check and clean all the connections to the wiring harness from
the CDI. I use di-electric grease on those.

Hope that helps.

Jim
Team LAGNAF






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