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► Modify message ( Re: HELP!!! Carb body, float pin pivot broke )

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:o Yes the Drifter 800 has a TPS or throttle position sensor, Ok I had to look it up and learned this:

The TPS is measuring the engine load and feeding that information back to the igniter.
Without the TPS in circuit you have a 2 dimensional ignition advance curve that advances the spark depending on the RPM, no matter what the load, similar to points and centrifugal weights of yesterday.
With the TPS in circuit you have the 3rd dimension. Now the igniter knows if the engine is under hard acceleration, cruising, slowly building speed or decelerating when it cross references with RPM. This is important as the speed of the flame front in the combustion chamber changes as the load on the engine changes and in turn the timing of the spark needs to change in line with the flame front to produce good ignition at the point of maximum chamber pressure.Not using the TPS certainly won't hurt your engine as the igniter reverts to the 100% throttle open ignition map. But you are losing out as the spark timing will be constant at any particular RPM no matter what the engine load/flame front speed and thus you are not taking advantage of performance/efficiency at any part throttle openings. This is why all modern vehicle ignition systems use an engine load sensor of some description and also why Keihin have gone to the trouble of incorporating a TPS on their lovely FCR39's. This also explains why we have seen the comment by many owners "I disconnected mine and didn't lose anything". If you disconnect the TPS, full power WOT will be the same as with it connected. Also a one or two BHP gain is very hard/impossible to detect on WOT unless on a dyno, so a one or two BHP gain on part throttle is definitely impossible to detect, but in everyday riding it'll make a difference.

that is it in a nutshell.......

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Topic summary

Posted by Troll

- April 22, 2017, 19:15:10 PM

800 carb should fit just fine, but the drifter has a tps on it to control spark advance, the regular 800 does not. Might not make any real difference, but it could effect drivability.

Posted by CDNRatMan

- April 22, 2017, 16:06:43 PM

I am not sure but Troll or greenBarn will have an answer there is a difference between the Vulcan 800 and the Drifter something about some TC>>> sensor.......

Posted by Tfrank59

- April 22, 2017, 12:45:02 PM

And you know of course that your bike is a Vulcan not just a drifter so you can shop for Vulcan 800 carburetor even if it's from a Vulcan classic 800.

Posted by Old Drifter

- April 22, 2017, 08:43:22 AM

Sorry to hear about this. Here's one that looks complete for sale. Hope this helps. http://www.ebay.com/itm/112262566960?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Posted by grinnell

- April 21, 2017, 17:01:56 PM

So my bike is not in great shape right now and I'm hoping for some help from my drifter friends in finding a solution. My mechanic went to re-build my carb and found that the previous owner used a nail to hold the float pin in place when the pillar piece broke off. I was unaware of this issue until this season and attempted to use a metal bonding agent with a make shift pivot but the piece failed and as you can expect I have a serious gas leak. My question is can ANYONE point me in the direction of a used carb body w/ good float pin pivots? Don't care about the jets etc bc I plan on using my existing ones but both pivots have to be in good shape. I really don't want to have to buy a new one since they are super expensive and I'm on a fixed budget having recently had a baby. I really don't want to go this route but is there any folks out there that have successfully tapped out a section of the cast carb body and made a pivot that successfully holds up the test of time? Any and all help anyone can provide would be very much appreciated. This is only the second season (really 1.25 bc I'm in MI) of having the bike and it has been a absolute nightmare so far but I LOVE this bike!

Issue explained below.

http://www.vulcandrifterriders.com/forum/index.php?topic=45377.msg101789#msg101789

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