Honda TRX 70 ATV questions?

[MD500E]

I recently came across an 1986 honda trx 70. It is in fantastic condition. It even has the original tires that are still 80% I cleaned up the carb and it started right up but did not run well. It ran for a few minutes, stalled and would not restart. It was getting fuel but when I checked spark it was almost more of a constant spark rather than on each cycle. It looks to have a CDI ignition system. Any Ideas?

Thanks.

 

[BigPapa]

I doubt it's ignition. If it's been sitting long at all I'd say it's probably carburation. Not trying to knock your wrenching skills, but we've had customers SWEAR they've totally cleaned a carb and they bring it in and it's still stopped up. The hole in the slow jet is only . 015". It stops up easily and it will not run unless you have the choke on if this is the case. Folks have a tendency, too, to hog these jets out using torch tip cleaners and such which will cause it to over-fuel and foul a plug. The petcock is part of the float bowl on that carb also and it or the screen gets clogged easily, also. I'd suggest taking the carb to a shop that does this every day and let them go through it. Like I said, I'm not trying to knock your wrenching skills.



Make sure the tank's not rusty and the rust is clogging the screen in the petcock. This is pretty common also.



You might also check the plug cap. They have a resistor in them that can go bad. Make sure to run a resistor plug in it because a non-resistor can cause damage to the CDI.



Those old 70 motors are tough and VERY dependable. It should serve you VERY well.



Scott

 

[MD500E]

Thanks for the advice. The carb has lots of corrosion on the inside, so I just ordered a new carb. Since I plan to keep it for a long time I thought it would be good investment. Thanks!!

 

[BigPapa]

I just ordered a new carb.

Thats one way to do it.



Scott