The last change done for tuning up the bike was to delete the boost bottle as with the oversize piston, it wasn’t required
BHPian SnS_12 recently shared this with other enthusiasts:
Getting the perfect tune-up:
So, with the first 162 kms of riding we identified a couple of changes/modifications that needed to be carried out to improve the tuning of the bike as per engine feedback. With the fourth oversize piston and Boyesen dual stage reeds the suction capacity had increased but the pilot jet being the standard size wasn’t able to cope with the extra fuel demand so we went one size up on both the pilot jets for now. As the bike is still in running period the RPM’s are maintained below 5k rpm so the mani jets will be upsized in case its required once we start riding in the hooligan zone that is post 6k rpm .
The next change done was to change both the needles to the new ones I got from Yambits. The last change done for tuning up the bike was to delete the boost bottle as with the oversize piston, it wasn’t required and also the design of the bottle wasn’t correct to begin with and plus it didn’t take a tight seat and was leaking on the manifold. Later, the excessive smoking especially at cold start was addressed by removing the 2T oil pump and recalibrating it. The setting for some reason had changed to two times the factory setting and both the one way valves were leaking oil as well. So, the pump was set as per factory setting and we increased the tension in the springs in the one way valves as the ball bearings were already changed and only needed the extra force from the springs to stop the excessive oil flow.
With the above changes the bike now runs much more smoother and the gear shifts have improved as well.. Waiting for Sunday to give it the proper beans below 5k rpm to enjoy bottom end torque rush and this bike is going to turn into a proper wild cat the day I can open the taps post 6k rpm
Some pictures….
The rear brake lever was pulled out a bit as I had to keep my foot at an angle to engage it
The other issue was that the grips were slipping on the throttle body because of this
All cleaned up
Fitted the grip again with adhesive
Tied down for a firm seal
2t level after 170 kms of riding and idling. Running twice the factory setting made is consume almost half litre of 2t oil
Coolant level was reduced by 50 ml. Tony says it might overflow a few times before it settles down because of the expansion
Amount of unburned 2T oil
Time to address the excessive oil drinking issue
Oil pump out to be recalibrated
Next up are the carbs
Pilot jet ready to be upsized
Old needles are out
New needles go in. Made a world of difference
2T oil top up
Giving it the beans
To clear the oil out and sync the carbs
One at a time + – 10 rpm
What an idiotic design. Would never work as it not even centred
Nylon bushes to close the manifolds
176 kms up and should cross 250 kms by Sunday
Check out BHPian comments for more insights and information.
