fitting EFI

[Gary]

Hi I have a problem I need solving. with little or no specialist tooling.

I want to fit a lambda sensor to my motorcycle. It is a 125 and the exhaust is chromed, thin steel . (ybr125 type)

I am fitting a Fuel injection kit and the sensor has to be about 3 to 6 inches from the head. screwed into the pipe.

I am wondering how to achieve this without going to an engineering shop with all that entails.

I had thought about using a hose screw clamp and a nut with the correct thread clamping to the pipe. Any simple and workable suggestions?

Thanks in advance

Gary

[Lee]

For the small amount of work it would take, welding a boss on has got to be the most practical solution, assuming you can make the correct size hole and clean up the plating, a decent (and friendly!) local garage should be able to do it for beer tokens.

Also, is this a four stroke 125? Because an O2 sensor isn't going to last very long (or at best will require frequent cleaning) on a 2-stoke...

[Lee]

One bodge I've been guilty of in the past :) is to find a bit of pipe which already has the O2 sensor threaded hole and cut and splice it into the existing pipe - though that might be quite tricky for the tiny pipe a 125 has :) :)

[Lee]

Shouldn't keep replying to myself, but what do you know, such a thing actually exists:

Not obvious how good a seal it makes on the pipe though...

[Chris Hogg]

It says "Complete with heat-resistant gasket strip to wrap around the exhaust before the clamp is tightened so there is no chance of the exhaust blowing (leaking)."

[Dave Plowman (News)]

Is this a narrowband sensor?

Not really - as you probably know the usual way is to have a boss welded into the pipe.

[Roger Mills]

If you could find a Rivnut[1] with the right thread, you could maybe fit that into the pipe. You'd have to check the temperature spec, though, to make sure it would stand the hot exhaust gases ok.

[1]

[Gary]

wow looks just like what i had in my head,thanks for that. not cheap though . i will have to add to wish list. the kit has not arrived yet

[Gary]

OK now the kit has arrived and now the job of fitting it has become a task.

I am at a loss with a problem that may not even be a problem.

The throtle body is a flang type and the holes are orientated verticaly. the carb mount is flange with the holes horisontal. is this a problem? do you think there is a " this way up" requirement or are these things not that fussy.

I have tried emailing the suppliers but not had an answer.

by the way I have ordered the clamp as above. my pipe is only 1.6 inch so i will have to pad it out but better than getting it welded.(I hope).

Thanks in advance Gary

[Dave Plowman (News)]

I doubt it makes any difference in running. But might make the linkage to the throttle more tricky. With horizontal choke TBs, the spindle is normally horizontal too.

[Gary]

I had not thought of that. The linkage is a cable so not an issue. I have ordered a piece of plate ally and will endeavour to make a converter plate. The suplyers are a bit ??? and do not answer English very well.

[Dave Plowman (News)]

Not possible to drill new holes in the correct position? Or find a TB that fits without mods?

If there is only one TB as you say the linkage might not be a problem if cable operated. But if they were multiple, the wrong orientation might be.