GPX750R resurrection

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Flick Of The Switch

Postby Mister_T » Mon Jan 29, 2018 10:28 pm

Since the tank is off I figured it might be a good time to pull off the upper triple clamp and look into dismantling and cleaning the igniton switch. That was the idea but the upper clamp does not want to come off. Maybe a gear puller would help but I'll consider that a last resort.
gpx750r_tank_off.jpg
So much blackness
gpx750r_tank_off.jpg (113.6 KiB) Viewed 580 times

Sometimes the switch would take a bit of jiggery pokey to get the bike to light up. Whether a new 5-wire repro from ebay would be any better than a cleaned up 30 year old OEM part is open to debate. For now I'll make do with cleaning the connector for the ignition switch.
gpx750r_ignition_sw_connector.jpg
Not great but not real bad either
gpx750r_ignition_sw_connector.jpg (62.28 KiB) Viewed 580 times

The spades are not quite as bad as they look in the pic but there is a bit of greenery growing there.
Since a little cleanup up and shoving the connector back together firmly the switching has been quite reliable so far.
I'm getting less than 1 ohm resistance across the switched power terminals so that will be ok for a while. The ignition switch is held on with shear bolts so the upper clamp would still have to come off one way or another. I'll let some squirts of Inox work their magic and try again some other time.
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Re: Flick Of The Switch

Postby Mister_T » Wed Jan 31, 2018 6:38 pm

The Inox worked its magic and the upper triple clamp was able to be removed with careful application of a hitting stick.
The ignition switch came out without any bother and is actually pretty clean inside.
gpx750r_ignition_switch_dismantled.jpg
After a minor cleanup is goes straight back together
gpx750r_ignition_switch_dismantled.jpg (61.16 KiB) Viewed 565 times

The kill switch will probably be dirtier as the right hand switch block sits out in all weathers.
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Re: Flick Of The Switch

Postby Mister_T » Thu Feb 01, 2018 9:33 pm

This is the live power terminal feeding into the ignition switch.
gpx750r_ignition_switch_power_terminal.jpg
This can be improved
gpx750r_ignition_switch_power_terminal.jpg (60.85 KiB) Viewed 552 times
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Re: Another one bites the dust

Postby Mister_T » Sun Feb 04, 2018 10:27 am

What is inside an errant Nichiwa X05FN plug cap?
gpx750r_spark_plug_cap_contents.jpg
Konnichiwa Nichiwa
gpx750r_spark_plug_cap_contents.jpg (39.38 KiB) Viewed 535 times

The brass plug which connects to the spark plug can be unscrewed with some effort. The red thing is the ceramic resistor and it is spring loaded against the brass plug.
In this case the resistor actually meters fine.The problem is at the upper end of the spring where it is corroded. Somewhere inside the top of the plug cap there is a gap between the terminal and the spring. Sealed off as it is you would think there would never be any problem but there you go.

In theory the spring could be cleaned up but getting deep inside the plug cap to clean up the insides would be rather difficult.
gpx750r_spark_plug_cap_spring.jpg
gpx750r_spark_plug_cap_spring.jpg (39.85 KiB) Viewed 535 times

To convert a plug cap like this one to a non-resistor type all you would have to do is cut a small metal rod to same length as the resistor and swap it in.
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Re: GPX750R resurrection

Postby Mister_T » Sun Feb 17, 2019 10:11 pm

Just when you thought it was safe to peruse the GPX & GPZ section, I'm back. Has it really been a year since my last post?

I finally got around to getting a new front tyre. I ended up choosing a Bridgestone BT45 which I have never used before.
Here is a pic of the profile:
gpx750r_new_BT45F_tyre.JPG
This profile looks conducive to tipping in and exploring cornering clearance.

What better way to run in a glossy new front tyre than do a loop out through the Dandenongs to Reefton Spur, Black Spur and back home?
Generally when I get bike tyres done I take the wheels off myself and take them in to the bike tyre shop. This time I didn't have adequate tools to remove the front wheel myself so I let the shop remove and replace the front wheel. [sigh]
The trip started care free but by the time I got to Warburton and well before the really fun bits, the front end was making squeely scrapey noises in time with the front wheel. :( I stopped off to check if the front wheel was about to fall off.
The speedo drive was hot as was the bottom of the left fork leg, both much hotter than the front discs. :x The right hand fork slider bottom was only lukewarm. The bearings seemed ok and there wasn't a lot of drag so I had a ciggy and continued.

The Bridgy BT45F seems to work nicely. I notice the front end stands up under front brake in a corner less than the old BT17F did, both of which stand up less than I remember my RC17 did.

Made it out there, scuffed up the front tyre and made it back with the noises continuing on and off. Well, I didn't scuff up the last centimetre on the edge of the tread since the front end is a bit questionable but I'll leave that for when I've acquired some more tools and figured out what I've paid to get fucked up.

Now I'll have to think about what rear tyre size I'll choose next time that gets changed. The stock rear is a 140/70 V18, I may go for a 130/80 V18.
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