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Re: Quota injection balancing
But the english translation is very poor and totally confusingMike Haven has an article on his MPH Cycles website that covers the Quota 1100. He recommends closing the air balance screw permanently and carefully syncing the butterflies so that they work in unison.
Syncing the butterflies is not at all easy because the design does not have a cute little adjustment screw. I worked long and hard one afternoon on mine only to get it close...but not as good as I wanted. The next time I mess with it I'm going to modify it so I can turn a tiny little screw to sync the butterflies. A modification like that is desperately needed for the Quota. ,,
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One possibility is that there is an air leak in one of the gasket joints ofter the cabbie piston. If the engine was tuned without this leak being found. This will cause the Idle Jet to be adjusted incorrectly, the Main Jet to be adjusted incorrectly.
If the Air cleaner is dusty or blocked, this will create unnecessary vacuum in the manifold, this will increase the operating temp of the engine and an unburnt fuel build up in the combustion chambers.
If fuel injected, Check that the fuel pressure is correct, and that the bypass pressure valve is working.
Check all throttle cable connections for cleanliness, for correct adjustment, and clean and smooth movement. Check that the throttle return spring is not stretched and that it is attached and working.
If a multi carburetors fuel system, check that the carburetors are balanced. Check that any balance and cross piping is connected and clean of any build up.
hi,this might help,it is very difficult to get the adjustments right without a set of carb balance gauges,the adjustments are very small and critical to the running of the bike,borrow or buy a set of gauges,hook up the gauges,balance the left two cylinders together so they are both running exactly the same,then do the two right cylinders and get them both running the same,then match the two sets together using the balance screw between no2 and no3 cylinders,a general rule of thumb to get a startng point is to wind the mixture screws in untill they stop,then back them out about 1.5 turns,do the same to all four screws before you start trying to balance the carbs,make sure the bike is sitting vertical or on the centre stand because if it is not it will effect the balance of the carbs and also make sure you have a good airflow over the front of the motor for cooling as it will take half to three quarter of an hour to get the balance right...most bikes need the carbs rebalanced on a regular basis because when the parts of the carbs start to wear the balance will change,a good set of carb balance gauges is a worthwhile investment...hope this helps
that when opening the throttle the front butterfly seems to open fully but the rear butterfly stop short by a few degrees. In other words, front and rear butterflies do not open exactly the same amount. The bike has done 9k miles and apart from maintenance and valve checks, have never bveen worked on. It is in pristine condition, runs great and pulls strong well beyond the 10k redline. I have not had 4V desmo's before and therefore cannot compare power wise, but she feels rather quick to me. For what its worth, it has the 50mm Termi half system and matching ECU.
Is this normal and just a result of the factory balancing exercise?,The length of the throttle linkage rod is set in the factory on a test bench. It is a brave person that messes with that linkage rod.
What is more accurate is to do a cylinder balance using carb sticks to check if cylinders are balanced on idle. If they are out by one or two degrees at full throttle the difference is minmal and not something that an average street rider should worry about. (When is the last tiem you were banging off the limiter for extended periods of time?)
At the same time check your throttle stop set screws to see if they are in the correct place.
If the cylinders are balanced at idle I would not worry about it.,,,
As far as carb balancing is concerned it is no where near as important as it is on a multi carb multi cylinder engine as all the mix from both our carbs goes into the same cylinder at the end of its journey. The main form of balancing carbs on our bikes is to ensure that they both have the same jets and needles fitted that the needle clip position and air screw adjustement are also the same and that the linkages are set and adjusted propery (and of course no air leaks or blocked jets on either ,