Sign in to follow this  
Followers 0
MichaelJFox

Yamaha QT50

19 posts in this topic

Alright!

I haven't collected this, but I will be tomorrow.

 

Hasn't run in awhile, been told it has good spark with low compression so it won't run properly.

 

Pretty excited to have something to tinker with, I guess I should pull it apart and check the rings etc first?

 

Pic for thread;

l7TDqe5.png

 

Cheers!

1 person likes this

Share this post


Link to post
Share on other sites

I've had several QT's over the years, cool little scooters!

Check out eBay etc to see if you can get hold of a MJ50 case, there 2 speed and make a huge difference.

image.jpg

Share this post


Link to post
Share on other sites

Have I got the right idea about the compression? Just whip the head off and see whats going on?

yeah probably means worn loose-ish rings? hopefully its not all slappy but a rebore is pretty cheap. you can get top end  big bore kits for them pretty easy too.

clean the carb first - dunno if theyre points or CDI but check points if it has them. Carb + points will be most of your starting issues sorted

1 person likes this

Share this post


Link to post
Share on other sites

Apparently it'll run without one but I'll blow the headlight? Which doesn't have a changeable bulb according to Google - strikes me as retarded though.

Share this post


Link to post
Share on other sites

Yeah the battery works as a regulator, no battery + high revs = dead bulbs.

 

Think I've got a headlight and some other QT bits here somewhere that might be of use to you?

Will check at some point to see if they are still down the back of one of my sheds or if they did go to scrap years ago.

Share this post


Link to post
Share on other sites

My FA had a rudimentary regulator in the cct that prevented that (zener diode or similar). Single wire going to small device that earthed to frame from memory. I assume the QT would have something similar?

Share this post


Link to post
Share on other sites

I have purchased said battery anyway. 

 

I'd be keen as on some bits Raizer if you've got any spares!

 

Cheers

Share this post


Link to post
Share on other sites

Alright this is the beast.

 

Someones disconnected the oil mixer I think, can someone have a look here and tell me whats up?

 

Do I have just to go fuel tank with premix -> carb -> success?

 

 

 

uxTeUSv.jpgjJnbmii.jpg5meVFRr.jpg3lguxEp.jpg

5 people like this

Share this post


Link to post
Share on other sites

shouldnt have any issue running premix 

 

UNLESS, it has oil fed main bearings, some bikes ive had in the past have an oil injector into a seal bearing and without the pump they would run the bearing. 

its unlikely this has anything like that, but pay to just check. 

 

also with premix, it may want a slightly larger jet in order to get the same amount of fuel in as the oil takes up some space and makes the fuel mix a little thicker, plug chops can lead you to success 

Share this post


Link to post
Share on other sites

Anyone's for $350 with the new battery and coil.

Need new beetle clutch fork/kit and flywheel

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0