engine won't fire

[Carry-All]

I am working on a friends Yamaha G1 1986; rebuilt the motor found the oil pump was done kinda explains why it needed to be rebuilt. Using mix oil and gas, Trouble shoot and found the fuel pump gone replaced with electric.

See link below it kinda fires but not ccompletly?

https://www.youtube.com/watch?v=8SJvej23qxI


I needed to go full throttle and full choke to get it to kinka pop as shown in the video

Any assistance would be appreciated

[cgtech]

So, you did replace both crank seals in the case when you rebuilt it, right?
Or did you "re-ring" it, as opposed to "rebuilt" it?

What you are describing perfectly matches air leaks.

[Carry-All]

yes replaced both it was complete kit both top and bottom all bearings crank everything.

I am wondering if its carb issue the carb is new just not sure

[Carry-All]

I removed the air box it was cracked and replaced it with dirt bike style air filter. there is a box at the top of the Carb it seams to have a sensor of some kind not sure what it is doing. I tried taking the box off and plugging the hole but it still won't fire.

Where would I check for potential air leaks?

The feed from the crank/bottom end for the old pump is open not sure if I should plug that? Also there is a line that connected to the oil pump plugged it on the carb and left it open to the pump............not sure how to connect

[Go4snypr]

Any chance its a timing issue from changing the seals?

[Carry-All]

not sure I didn't change anything marked everything I took apart and put it back the same way

How do I check or change the timing?

[Carry-All]

Let’s recap

First of all thanks for replying I do appreciate your assistance.............Very new to the cart world I have a Carry-all that I just redid can fire some photos its a 4 stroked so it was easier for me. The older 2 strokes not allot of people seam to have advise or knowledge

So I heard the new carbs are crap so I kept the original and cleaned it up...........How should I set the screws on the carb I think there looks to be 2 adjustable ones?

[Carry-All]

Almost forgot the timing do you know how I check/set and set the timing on the G1 2-stoke?

[Go4snypr]

To adjust, you move the coils one way or the other under the fan on the passenger side. I will try and find the link i was reading. But there should be a sight glass with 2 marks that have to line up on the fan side. Havent done it myself or even looked for the marks. But if your coil didnt go back in exact when you did the seal on that side your timing may be out.

[Go4snypr]

Google yamaha g1 timing adjustment. there may be a good link on a page about other cart aholics.