cam chain tensioner

[docc]

12 minutes ago, Lucky Phil said:

You'd be better off just adjusting the CO as a quick and dirty way to control the popping rather than the Tps sensor. The CO setting affects the whole range but is most effective at the bottom. 

Phil 

Agreed. The TPS indexes 'the map" to the entire rpm range.  Not the best place to compensate for some other shortcoming.

Sure, the "shortcoming" could be compromised injectors. May I ask if both the fuel and air filters have been renewed?

[pete roper]

There is also the problem of wear simply due to age and use. As the spindle bushes wear the plates will settle in the chokes carving out the edge of the TB and wearing the plate. This means that more air can move past the plate so the mixture goes lean. This is mainly an issue at idle and leads to spitting back through the inlet tracts and this exacerbates the problem and increases the wear. It’s something I’m very aware of because the big 50mm TB’s on the 8V’s are particularly susceptible to it and it’s a king sized PITA.

The larger the choke the worse the problem becomes. I can’t remember what size the TB’s are on the V11’s but I seem to remember that they actually downsized them for the early 2 valve CARC bikes and they are not nearly as prone to showing unacceptable behaviour as they age compared to the 8V’s. If, as I suspect, the V11 TB’s have larger chokes then one would have to think that they would be more prone than the early CARC bikes to ‘Air Leakage’ but not as bad as the 8V items. If I’m correct in that it would perhaps explain part of the problem at least.

At the end of the day if more fuel is required at a certain engine speed and throttle position by far the best way to achieve it would simply be to add more in those cells in the map rather than kludgeing it with the CO trim or buggering about with the TPS.

[Lucky Phil]

I think they are 40mm Pete from memory. The MGS-01s were 45 I think. Add the throttle shaft bush wear as well. When I got the Daytona engine running I thought I had valve tapping noise on the r/h cylinder at idle until I touched the butterfly shaft on the r/h TB and it stopped taping in time with the intake pulses. This led to rebuilding the TB's

Phil 

[PhillipLarsen]

Thanks Docc, Peter and Phil for your advice. Will do more checking to try corner the issue.

The air filter is new, but fuel filter is not. I just happen to have a new one on the shelf so I will ride out the full tank of fuel in next couple days, pull the tank off and change it, see if any change by setting TPS back to 157 mv and trying it. 
The TB shafts do not feel like they have any play ( bike has just approx 26,000 kms on it). 
I use short bolts with copper washers to close off vacuum nipples holes when not in use. 

[Pressureangle]

12 hours ago, Lucky Phil said:

I think they are 40mm Pete from memory. The MGS-01s were 45 I think. Add the throttle shaft bush wear as well. When I got the Daytona engine running I thought I had valve tapping noise on the r/h cylinder at idle until I touched the butterfly shaft on the r/h TB and it stopped taping in time with the intake pulses. This led to rebuilding the TB's

Phil 

Since it's right at hand, my 2000 v11 bodies are (actual) 44.68mm vertical and 44.71mm horizontal at the inlet.

Edited June 13 by Pressureangle

[pete roper]

5 hours ago, Pressureangle said:

Since it's right at hand, my 2000 v11 bodies are (actual) 44.68mm vertical and 44.71mm horizontal at the inlet.

That’s what I thought. Nominal 45mm on the V11. CARC 2-valve motors use 40’s from memory and the 1200’s use 50’s. When they went to the 1400 they went single 54mm body with ride by wire control.

Mark, (Beetle.) has converted his Griso which runs a big port single spark version of the motor that we built for him to a single mechanical TB, I think it’s a 60mm? Not absolutely sure. Had to go to higher flow injectors too as boy does it like the dinosaur juice!

[audiomick]

6 hours ago, Pressureangle said:

... 44.68mm vertical and 44.71mm horizontal ...

What? They're out of round? I'm shocked and dismayed!!! 

[Pressureangle]

3 hours ago, audiomick said:

What? They're out of round? I'm shocked and dismayed!!! 

Well...to be fair, could have been my badly angled wrists leaning over the tools I should have put away while the lift is at full height.

[PhillipLarsen]

And thanks @Pressureangle, I will get the injectors serviced at next opportunity when can have the bike down without affecting my riding plans, just to ensure there are no hidden issues. 
There are several companies that service gas fuel injectors here in the Vancouver area.