intermittent fuel issues

Morph1976 · Oct 2, 2020

Jvheli said:
I’m curious if you did what I mentioned on page 1? Before you go mucking about balancing throttle bodies (which is important but not at all related to your problem). A vacuum leak will/can cause poor running, unstable running. For less than $15 bucks, it’s good maintenance that the age of your bike could do with.
Same applies to the low tension leads to the coils. The KISS principal has served me well in the nearly 40 years I’ve worked as a mechanic!

i ordered some pipe but not the vacuum pipes, thankfully i didn't put them on, i have some more on order. leads wise do you mean the HT leads that attach to the plugs, if so ill get them too

Gregger · Oct 2, 2020

Jvheli said:
I’m curious if you did what I mentioned on page 1? Before you go mucking about balancing throttle bodies (which is important but not at all related to your problem). A vacuum leak will/can cause poor running, unstable running. For less than $15 bucks, it’s good maintenance that the age of your bike could do with.
Same applies to the low tension leads to the coils. The KISS principal has served me well in the nearly 40 years I’ve worked as a mechanic!

Agreed. Your vacuum readings seem a bit low. Typically they are over 600. Are you sure you don't have a vacuum leak? Check the throttle body rubbers and clamps also. I have used acetylene to check for leaks while in the auto industry. Works better than propane.

Jvheli · Oct 2, 2020

Morph1976 said:
i ordered some pipe but not the vacuum pipes, thankfully i didn't put them on, i have some more on order. leads wise do you mean the HT leads that attach to the plugs, if so ill get them too

The vacuum lines that run from the MAP sensor to the throttle bodies. You don’t need the fancy Triumph ones, good quality automotive vacuum hose works fine. Just match the old (original) length. Also, there are three caps on each throttle body, replace those too. Available at auto parts stores.
The LOW tension leads are the two small wires attached to each coil. They are somewhat prone to corrosion, and get loose over time. You can just remove and clean each wire connector and terminal, make sure they go on tight, you can squeeze slightly with a needle nose pliers to increase their hold.

Morph1976 · Oct 4, 2020

Is this my map sensor?

Morph1976 · Oct 4, 2020

Also, sorry to be a pain as I'm not good with engines but a fast learner, where are the coils located. I have attached a picture of to of bike

Jvheli · Oct 4, 2020

Morph1976 said:
Is this my map sensor?

Yes. Good idea to remove the electrical connector, clean and reinstall.

Jvheli · Oct 4, 2020

Morph1976 said:
Also, sorry to be a pain as I'm not good with engines but a fast learner, where are the coils located. I have attached a picture of to of bike

Follow the three sets of spark plug wires. They terminate at a coil. One coil per cylinder.

Morph1976 · Oct 5, 2020

Whew this has been a learning curve... took the tank off and clean low density wires and crimped to make sure tight, and given map sensor a clean. Next is to put tank on though when I took it of, one of the fuel pipes came off with the tank and cant for the life of me see where it goes back. As pictures show I have one at side of tank just next to fuses, fuel hose on top but there is another fuel line attached to the nipple on tank but cant see anywhere to connect it. Have looked for videos but cant see any. Could you tell me where its located please

R-III-R Turbo · Oct 5, 2020

The fuel hose from the banjo on the bottom of the tank goes to that metal pipe in the 2nd pic. Needs jubilee clips too as it is under 3 bar pressure in operation.

The tank also has 2 breather tubes, which just shove onto the 2 nipples on the left side if the bottom of the tank. They both run down there past the front of them relays on the left side of the saddle, (between the air filter box and the chassis), and through the wire loop tidy beside the starter motor, and terminate open ended there.
One has the rollover valve inline in it at beside the relays as per your 1st pic.

Morph1976 · Oct 5, 2020

R-III-R Turbo said:
The fuel hose from the banjo on the bottom of the tank goes to that metal pipe in the 2nd pic. Needs jubilee clips too as it is under 3 bar pressure in operation.

The tank also has 2 breather tubes, which just shove onto the 2 nipples on the left side if the bottom of the tank. They both run down there past the front of them relays on the left side of the saddle, (between the air filter box and the chassis), and through the wire loop tidy beside the starter motor, and terminate open ended there.
One has the rollover valve inline in it at beside the relays as per your 1st pic.

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intermittent fuel issues

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