TB Synch + TPS reset

[stuarto49]

I HAVE searched and reviewed a dozen threads on T/B Synch but I would like to confirm how much strip down is required on my 06 Capo.

I recently did a 32,000 mile major service including valve check (all in spec!), oil change, air filter, spark plugs, etc. Next is T/B Synch & TPS check.

From what I have read I need only to remove the left lower panel to access the service hoses and connect them to my Motion Pro mercury stick. I also have a Twin Max digital balancer which I may try as well. I have used both devices on several previous machines. So I don't need to lift the tank? Or airbox?

After the T/B balance I plan to connect my Centurion Pro Europe, check the TPS and reset if necessary.

Welcome all comments and tips. Thanks, Stuart

[mrjim130]

If you look the sync ppes are there to hook up too. Very easy.

[ELMOSISU]

look under the rider seat on the left side of the rear cylinder, near the frame rail for 2 clear vinyl tubes parallel to each other. They are the only clear tubes in that area.
they have rubber plugs in them.

[vilaishima]

While we are on the topic, what is required to do a TB synch?

[ELMOSISU]

I've used a homemade tool like this for years on all of my twin cylinder bikes.


All we care is that the "water column" is equalized, to create equal vacuum for each cylinder.

check this out.

http://www.650ccnd.com/mano.htm

[vilaishima]

I've used a homemade tool like this for years on all of my twin cylinder bikes.


All we care is that the "water column" is equalized, to create equal vacuum for each cylinder.

check this out.

http://www.650ccnd.com/mano.htm

Cool Beans! I''l give it a bash making my own.

What exactly are the symptoms if the TBs are not synched? Does it have more of an effect on idle and not so much while riding or do I have this all wrong?

[Stu_O]

Cool Beans! I''l give it a bash making my own.

What exactly are the symptoms if the TBs are not synched? Does it have more of an effect on idle and not so much while riding or do I have this all wrong?

Symptom would be a lumpy idle. In the case of the Capo or any other bike where the throttle plates are fixed in relation to each other, the idle synch has no effect at higher throttle settings. All you're doing here is equalizing the air flow under the throttle plates at closed throttle. On bikes with separated carbs or throttle bodies, the actual throttle plate openings are being synchronized, so the adjustment has effect across the entire throttle range.

BTW, be sure to use the procedure specific to the Capo and Futura, not the one for the other Rotax-powered models.

Stu

[Pplummer]

Good questions, I already read about the location of the tubes in the service manual, i'll be doing this quite soon too. Do you have to remove the tank to get to the screws on the throttle bodies? (Just curious) I haven't tore the tank off yet to see where they are located.

[stuarto49]

Let me know when you plan to do this service. If I'm not in China I will come down (160 mi) with my VDST system and Motion Pro mercury carb stick, etc Also have an electronic Twinmax balance gauge which we can try. This has variable sensitivity - quite accurate.

I would like to become more familiar with all these service details.

I did locate the 2 access tubes yesterday, just below and ahead of the rider's seat, connected them to the mercury stick, and found balanced TBs within about 1cm Hg. This actually improved with light throttle. So my idle is probably about as good as it gets. I did NOT yet connect the VDST - maybe today.

Stuart Ostroff
Richmond

[ELMOSISU]

Good questions, I already read about the location of the tubes in the service manual, i'll be doing this quite soon too. Do you have to remove the tank to get to the screws on the throttle bodies? (Just curious) I haven't tore the tank off yet to see where they are located.

You will have to remove the plastics and loosen the tank in order to tip it upwards from the rear in order to expose where you need to get a screwdriver. I support it with a block of wood on the rear cam cover. The lines need to be hooked up, as the motor is running when you are adjusting. the adjustment screw(s) is on the left side of the TBs near the base. You should only adjust one side. the other should be 100% closed.

[stuarto49]

I have that exact block of wood and it props up 3 different tanks on my 3 bikes!

Stuart

[Pplummer]

Thanks guys. Stu - I have a Carbtune and a Gastester for the bike already! I may try and get to it sometime soon. Work has had me swamped lately and I haven't been able to do to much. I am going to break down and have a friend of mine wire the 49 Suburban for me. I love doing it, but I just don't have the time and I want to drive it this summer. It's one of the last things I need to do before I fire the new engine.