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Hello, If you have tried with full fuel tank, the pump operation could be confirmed by releasing the pump outlet hose from the carbs and leading it into some container where you can fill the fuel coming from the pump. Then switch the ignition on to see the pump operation. Could repeat this test...

Hi, For the v-boost valve, did you check the ACTUAL opening inside the tunnels between the carbs? Because the valve can still seem to move correctly even if the connection is not ok. I checked it so that while the carbs were removed and the fuel pump wiring socket disconnected, I connected the...

Hello, When the engine has some "popping" problem, it is good for safety's sake to rule out the ignition problem, as it can cause these symptoms. They are relatively easy to check and you only need a multimeter to do it. You should check: - pick-up coils, see...

Hello, If the engine is running nice when cold, but experiencing problems when hot it sounds like there is generally one of these two main problem paths existing: 1) Carb adjustment is on the rich side. For this there are the following things to do first: - check the air inlet passage for...

Hello, If after other checks of the intake system it is found necessary (preferable) to change the size of the main jets, I strongly recommend to check the flow rates of the old ones first - in case that the current main jets have been there for a while. This is particularly true if you have...

I think this theory can now be confirmed after following happened: I had carbs off and fuel pump disconnected for some v-boost movement range and jetting adjustment. Max worked perfectly normally before disassembly (except the need for setting). After putting the parts back - however - it did...

Hello again, After having most starting and ignition related sockets apart (for getting the pins checked and treated with corrosion prevent spray) there occurred two very interesting problems. The problems were not so special, but the solution (same for both problems!) sounds almost like...

Hello, I had problems with the v-boost operation for some time. The movement did not happen at all or it happened incompletely. Then one day it stopped working. I first checked the servomotor by applying there voltage through b/r and b/y wires, but no action either way. As I did not want to...

Hello, It's definitely better to upgrade to the r/r unit of the new model. I had also this problem before and decided to get the newer type. It has been working really well. I asked the genuine Yamaha unit first (cost over 200 euros here), and then ended up to buy an aftermarket unit. This was...

Received and installed the new set of pick-up coils two days ago. The problem is solved, as expected. It's nice to see clearly the colours of the wires coming from the coils. From the old ones, it was extremely hard to see, as they were all looking the same brown oiled mess. Anyway, for the...

By the way, in order not to make easy mistake when reading the ignition HT coil measurement values, note that the spark plug HT wires of front cylinders are crossing - i.e. the coil located at right front gives spark for right left side cylinder and vice versa.

I've made my headlight set-up as follows: Replaced the stock headlight with a little bit smaller double headlights. Both have 55W H3 bulbs in. The connection logic is changed so that when the switch is in "LO" position, only one of the headlights is on. When the switch is in "HI" position...

One more good thing to check when having ignition problems are the ignition HT coils. There are four of them, one for each cylinder, and each one has got primary side and secondary side. Factory specification for primary side resistance (between red/white and orange wires) is between 2.4 and...

Hello. The symptoms sound just like mine. The problem was one of the two ignition pick-up coils. See http://www.vmaxforum.net/showthread.php?t=3876 Measuring the resistances is very quick and easy operation to conduct. The connector is located under the saddle, and the wiring is coming from the...

Thanks man, but I already placed an order for new set of coils. When one coil makes problem, it is likely that the other one will do the same soon. New set should guarantee plenty of problem free miles /kms - and that's what I want as this bike is a long term one. Thanks anyway and regards, AT

As it was clear that one of the ignition pick-up coils was bad, I decided to open it... Bye bye 375 euro... First tried to open it gently and smoothly in order to possibly put it back. Well, quite impossible! So I just wanted to see in and applied more force...by hammer - and got it in pieces...

It is good idea to check also the resistances in the ignition pick-up coil wiring. This is very quick and easy operation to conduct. The connector is located under the saddle, and the wiring is coming from the alternator side there. Depending on the year model there are either 5 pins or 2 pins...

Sirs, First of all, as a new guy here in the forum, I have to say that the place is great! There are really valuable pieces of information available here, as I've found out so far. :biglaugh: I've got -85 Max type 1FK full power model. There are 46000 miles on the clock. The set-up is as...