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To get my carbs running on my pinto for the moment I’m just going to leave the dizzy vacuum disconnected. However going forward I’m going to want to upgrade the ignition. Wasted spark systems all seem to require either TPS or map... however I’m slightly confused if there are any ‘stock’ connections on the carbs that are suitable to use? For example, I’m confused what the 4 little ports on the underside are for?  The manifold I have is a bogg bros one. If not, can I tap into each of the blue tubes the connect the carbs to the manifold and use that at as my feed?  Btw...Carbs are Keihin‘s off a Kawasaki zxr750 |
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Jul 21, 2019 10:11:38 GMT
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I'm sure ZXR750 didn't run TPS, too old.
They should have a vacuum port on each carb at the top probably capped with a 'rubber' cover. These are used when balancing the carbs.
By ports I assume you are talking about the tube/nipple at the lowest point. IIRC they will be float bowl drains, the screw gets loosened inside that plastic collar (like they put on dogs when they've had their nads off!)and the fuel drains out.
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Needs a bigger hammer mate.......
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Jul 21, 2019 10:13:47 GMT
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The little nipples on the bottoms of those bowls are for draining the carbs, I believe in those carbs there isn’t any ports that you could use for MAP.
Later generation ZZR600 carbs came with a TPS on the side, I’m not sure whether the one you have could be modified in a similar way, maybe worth a look?
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Jul 21, 2019 10:54:47 GMT
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Needs a bigger hammer mate.......
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Sept 19, 2019 20:02:09 GMT
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Bit late I know, but thanks for the replies...that explains what some parts of the carbs are!
Do all bike carbs have vacuumed ports to allow synchronisation? Or do some (like mine) simply not?
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Sept 19, 2019 20:43:00 GMT
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You already have somewhere to connect onto for a MAP sensor on the manifold, tee off where the servo pipe for the brakes connects to highlighted on the picture.  |
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Sept 20, 2019 14:19:22 GMT
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You already have somewhere to connect onto for a MAP sensor on the manifold, tee off where the servo pipe for the brakes connects to highlighted on the picture. I thought to get a decent MAP signal, you needed to use a take off from all 4 connected to a central reserve to avoid pulsing? |
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Phil H
Posted a lot
Posts: 1,448
Club RR Member Number: 133
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Sept 20, 2019 18:47:16 GMT
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You won’t get much manifold depression anyway with a choke per cylinder - not enough to make any real sense tuning for the road. It’ll be there or not - no definition.
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Sept 20, 2019 20:34:31 GMT
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You already have somewhere to connect onto for a MAP sensor on the manifold, tee off where the servo pipe for the brakes connects to highlighted on the picture. I thought to get a decent MAP signal, you needed to use a take off from all 4 connected to a central reserve to avoid pulsing? You are correct, I know DANST do a balance bar to prevent pulsing on their manifolds, link to show idea below. Youd be better tapping into the ally/steel inlet pipes so fix three on the other ones and link them, picture of the product explains it better
I thought that NODIZ will run without TPS but that may limit adjustability?
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Needs a bigger hammer mate.......
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Sept 20, 2019 20:48:19 GMT
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I thought that NODIZ will run without TPS but that may limit adjustability? I think megajolt is the same - simply don’t connect to a MAP/TPS signal and it’ll run in 2d mode.. |
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Last Edit: Sept 20, 2019 20:48:39 GMT by sarkie83
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