TEST RIDE #1

[El__burro]

Good day,
Today I have taken the bike (k2) for a test ride.
Still need to adjust a few things.

1 The bike runs fine on the first part of the throttle then it struggles (unless I open the throttle very gently)
2 Both front and back end feel not stable (quite stiff).
3 At traffic light it's quite smokey.
4 After replacing for the 3rd time both oil seals the RH side fork still leaks.

these are the issues I would like to sort out first.
Can you help?
El__burro

[Johnwebley]

Good day,
Today I have taken the bike (k2) for a test ride.
Still need to adjust a few things.

1 The bike runs fine on the first part of the throttle then it struggles (unless I open the throttle very gently)
2 Both front and back end feel not stable (quite stiff).
3 At traffic light it's quite smokey.
4 After replacing for the 3rd time both oil seals the RH side fork still leaks.

these are the issues I would like to sort out first.
Can you help?
El__burro

do a plug check at mid-range ,is it lean ? or sootty ?

try thinner oil in the forks,at the rear,can you soffen the spring pre-load ?

the smoking may be due to mixture issues

[El__burro]

I have not managed to do far another ride yet,
Tomorrow (if weather is ok) I'll check the plugs.
Fork oil is as suggested by manual and leaks from one fork only.

Thanks
el__burro

[Jontyp]

From past experience, if a fork leaks even after new seals then it often means that the fork leg has some pitting or scores somewhere in its travel. They can be very very small and hard to find.

[El__burro]

From past experience, if a fork leaks even after new seals then it often means that the fork leg has some pitting or scores somewhere in its travel. They can be very very small and hard to find.

This morning I have re re replaced the seal on the right hand side.
At first inspection it holds fine. Hopefully it will stay that way
otherwise I will look for a replacement part.
Thanks
el__burro

[El__burro]

From past experience, if a fork leaks even after new seals then it often means that the fork leg has some pitting or scores somewhere in its travel. They can be very very small and hard to find.

You were right, After I replaced 3 seals, it still leaked, once I replaced the stanchion it is sorted.
Thanks
el__burro

[El__burro]

In regards of the test ride, the bike struggles when I open the second half of the throttle.
Below is one of the plugs I checked this morning.
What shall i look for?



Thanks
el__burro

[Greebo]

That plug looks like it fouled up mate, its running far too rich, the plugs should be a greyish to light brown, if dark brown, or black like it is now I would sling them get a new set but before fitting them weaken the mixture, because its running far too rich try one full turn on the mixture screws & give it another run

[K2-K6]

As above, the plug is showing far too rich a mixture compared to what it should look like as I've always worked toward pale milk chocolate colour as being close to correct mixture.

There is a big qualifier to that though, the engine should be warmed to normal operating temperature and then you'd get it pulling hard in something like third gear and fairly well up into the Rev range I.e. full throttle, then cut the motor and coast to a stop. Only then pull their plugs and check the colour to see what the main jets are letting the mixture run at. Once you get the main jets right you can fine tune with the needle position and air screws to fit the lower regions around that.

[MarkCR750]

Tried that on my T250, unfortunately the ignition key is below the petrol tank (and no engine kill switch fitted), damn near crashed trying to reach the key! 😀

[El__burro]

.. UPDATE ..
 after cleaning all 4 spark plugs and giving the carb mix screw a full turn out (from all closed) it did run slightly better, eventually once i checked the plug after a 10 minutes ride they were as dark and fouled as before( as per img above).
Shall i open or close the mix screw?
Something that concerns me is that when I am in a bend the front of the bike wobbles a bit.
I checked all the connection and the wheel is properly installed.
no play at fork level either.
Any ideas?

Thanks
el__burro

[Johnwebley]

try another turn out,and see what happens,

 as for the wobbles,all bike have a slight wobble around 40 mph,but should be okay with both hands on the bars,

check the steering head,make sure its not to tight ,

[El__burro]

all bike have a slight wobble around 40 mph,but should be okay with both hands on the bars

Thanks, actually the wobble happens at 10mph too

I'll give the 1/2 turn a try tomorrow

el__burro

[Johnwebley]

Go for 1/2
Then 1/2 again if needed.
The wobble sounds like
the headrace is tight. Try
to loosen 1/4 turn

Sent from my SM-G361F using Tapatalk

[El__burro]

What's the headrace?
Thanks for your help
el__burro