Honda Z50R will not start.

[Thecatmilton]

I have a 1981 honda Z50r that I cant get to start. I poured some seafoam and marvel's mystery oil in the gas tank and oil. I changed the oil after running it in there for about 30 minutes, rode it again for about 30 minutes with just seafoam in the oil, and changed it again. When I changed the oil the last time I broke the already broken and brittle spark plug wire off completely so I was not able to start it fo about a week untill I ordered a new Ignition coil off of ebay for $14.00 and expected it to start right up... Except it didn't. I tried push and kickstarting it and nothing happened. Any Ideas?

 

[manchester1]

Make sure the coil is not defective. Check for spark. Then you can check other things:thumbsup:

 

[smallbikes88]

new spark plug, and make sure its getting gas. i really dont like useing seafoam in these little motors? but some people do.

 

[Thecatmilton]

I think its the new coil. I put a nail in the spark plug connector piece and put it about 1/8in from the head and saw no spark when i kicked over but when I take my old broken coil i can see a spark jump from the small bit of remaining wire.. @manchester When I seafoamed it black oil with globs in it came out of it twice and the third time I got dirty (but see-thru) oil with small globs in it. I noticed that It had a bit more acceleration after the first run and the white smoke wasnt as bad. :shrug:

 

[Thecatmilton]

I got it running today with a coil off a 1972 z50. Does anybody know what could make a z50 really smokey. It has always done this. It is grayish white smoke if that helps. I'm just happy that it is running again.

 

[Thecatmilton]

Should I try a thicker weight oil to reduce smoke? I have 20w30 in it currently.

 

[5horsebriggs]

I use 10w30 also are your rings and cylinder good?

 

[theboilermaker48]

Should I try a thicker weight oil to reduce smoke? I have 20w30 in it currently.

you can try adjusting the height on the needle valve in the carb throttle slide u can run it leaner.. also drain the oil and only put a little oil and then you can wein out the problems

 

[Thecatmilton]

you can try adjusting the height on the needle valve in the carb throttle slide u can run it leaner.. also drain the oil and only put a little oil and then you can wein out the problems

Why would I put less oil in it? the current oil is fresh and in the middle of the dip stick cap thing.

 

[minibikedude]

If the engine is smoking its time for a new piston and rings, Lap the valves and or replace them, Seafoam and Marvel is best for fuel stabilization for winter storage not a mystery oil repair for a bad cylinder and rings.

 

[Thecatmilton]

Should I replace my whole piston or just the rings.

 

[minibikedude]

It may cheaper to go to DRATV.com web site and get a new jug, piston kit and gasket kit. Take the head off and look at the condition of the cylinder to see how is. You should also lap the valves and see how worn out the valve seats are will its apart.