Mouting TTO Temp gauge
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Hooked
Rat 2003 Stella 2T; 1979 P125x (in pieces, out for paint)
Joined: 12 Sep 2015
Posts: 161
Location: Madtown
Fri Jun 19, 2020 11:15 am quote
Hi guys,

I received a TTO CHT gauge. It looks to be pretty high quality. They (Trailtech) sent me the wrong one, and very nicely shipped the correct one out the next day via next-day air. Nice company to work with.

I have the extension cable and was planning on velcro-taping the gauge to the top of the glove box. I would like to run the wire through the tunnel. What's the best way to get the wire where it needs to go?

I am thinking:

1. drill hole into top of glove box, run wire into glovebox through a grommet?
2. Then...what?...drill a hole into the center tunnel and run wire through?? Given the size of the wire connectors on the extension I think this would have to be a pretty big hole...
3. Exit--where--through hole where fuel line comes out?

I currently have an RPM gauge mounted on top of the glove box, but there I just drilled the top of the box and ran the wire out the bottom of the glove box and across the floorboards, hiding it under a rubber floorboard mat. That looks pretty ghetto without the mat (which I would like to get rid of anyway).
Ossessionato
73 Rally, 74 Rally, 76 ET3, 80 P200, 06 PX150, 65 Li225 Silver Special, 86,95,96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3616
Location: Oceanside/ SF
Fri Jun 19, 2020 1:44 pm quote
Custom Trail Tech CHT bracket for donation

Shameless plug.
Hooked
Rat 2003 Stella 2T; 1979 P125x (in pieces, out for paint)
Joined: 12 Sep 2015
Posts: 161
Location: Madtown
Fri Jun 19, 2020 5:04 pm quote
I think I want one...but more details about routing the wire back to the cylinder needed...

How do I get the wire into the tunnel (or otherwise back there without drilling?
Addicted
bare metal cafe racer
Joined: 01 Sep 2017
Posts: 806
Location: Aotearoa (New Zealand)
Fri Jun 19, 2020 5:19 pm quote
Mount it to the headset. Route into the headset (Iíd try to sneak into the light switch housing then through the wiring tunnel). Then come out through any hole available near the motor - would guess you wonít need to drill any more holes. I managed to fit auto lube and heaps of extra wires (CHT, starter motor, VAPE loom...) through the existing holes on a VBB when I put a P200 in it.
Addicted
bare metal cafe racer
Joined: 01 Sep 2017
Posts: 806
Location: Aotearoa (New Zealand)
Fri Jun 19, 2020 5:24 pm quote
yackee wrote:
I think I want one...but more details about routing the wire back to the cylinder needed...

How do I get the wire into the tunnel (or otherwise back there without drilling?
You canít. If you are set on mounting to the glovebox you will need to drill a hole. I have my loom connections hiding in the glovebox so I did drill a hole in the tunnel. As small as possible - which means it is really tight getting the wires through. Probably shouldíve made it bigger... if I need to strip the frame again I will - and get something (like a thick washer) welded around the hole to give back some strength.
Ossessionato
73 Rally, 74 Rally, 76 ET3, 80 P200, 06 PX150, 65 Li225 Silver Special, 86,95,96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3616
Location: Oceanside/ SF
Fri Jun 19, 2020 7:15 pm quote
So I ran my wires through the same hole the rear brake cable comes out of. Then fished it to the headset and then out of the 4 screw holes that hold the headset on. I could have drilled new ones or gone out the same hole the throttle cable comes out of but I just went out the screw hole. (White P200 on the thread I plugged)
Hooked
Rat 2003 Stella 2T; 1979 P125x (in pieces, out for paint)
Joined: 12 Sep 2015
Posts: 161
Location: Madtown
Sat Jun 20, 2020 4:43 am quote
MJRally wrote:
So I ran my wires through the same hole the rear brake cable comes out of. Then fished it to the headset and then out of the 4 screw holes that hold the headset on. I could have drilled new ones or gone out the same hole the throttle cable comes out of but I just went out the screw hole. (White P200 on the thread I plugged)
Thanks, this sounds very promising. I'll give it a try.
Hooked
2003 PX200
Joined: 28 May 2010
Posts: 372
Location: Perth, Scotland
Sat Jun 20, 2020 10:41 am quote
How I ran the cable for my trailtech on my PX ..

Remove horn cover .. remove fuel tank.

Removed the wires from the connector block (possible to do using thin screwdriver) at one end of the extension wire .. ran wire through hole used for indicator wires .. brought excess wire into area behind cover .. used a straightened coat hanger (or similar flexible metal wire) to get from horn cover to area below fuel tank .. brought out through frame to area of engine .. refit wires to connector block.

This then gives you an extension cable that runs from tool box to engine. If you have to replace either TTO or plug sensor you donít have to remove fuel tank or horn cover, just fit new sensor into connectors of extension cable.

Donít drill tool box, just slacken off fixing screws to allow enough space to pop cable through gap at the top and sit TTO on top of tool box with Velcro or double sided tape.

The only issue I have with the TTO is there is no backlight to keep an eye on the display at night time.
Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and new to 2018, '66 Blue Badge Smallframe
Joined: 30 Nov 2011
Posts: 7658
Location: Victoria, Australia
Sun Jun 21, 2020 7:23 pm quote
Some people have had success cutting and re-joining the connectors. I tried and it stopped working. Just fyi.
Enthusiast
Px125 2009
Joined: 31 May 2020
Posts: 57
Location: UK West Yorkshire
Sun Jun 21, 2020 10:54 pm quote
if that's the little oblong one, I had one years ago, I used a hot glue gun and stuck it to the left side of headset and ran the wire underneath then followed the cables.
Take the brake pedal off helps routing it and fuel tank out.
Hooked
Rat 2003 Stella 2T; 1979 P125x (in pieces, out for paint)
Joined: 12 Sep 2015
Posts: 161
Location: Madtown
Mon Jun 22, 2020 9:13 am quote
I mounted the TTO CHT gauge temporarily this weekend (on the center mat, between my feet) and took a 50-mile run along some beautiful Wisconsin roads. Hitting indicated speeds up to 65 mph, but mostly stretches of 50 mph or so, with occasional stop signs.

It was great to be able to see how the engine temp was reacting to different riding conditions. Sometimes more RPMs would cause temp to drop. Steep hill = temp to rise. Changing my plug from a NGK "6" to a "7" -- no real impact on CHT readings. Interesting!

Temp (from the inside lower stud) was consistently between about 275-320 f (ambient temp was about 80), with a high of 336 f. (I'm running a malossi 166, SIP Road, 24 carb, timed to the "it" mark, or 18 degrees). When I got home I did a bit of research and those temps sound OK, but maybe a bit higher than they should be. It encouraged me to check my main jet size, and I discovered that I had a 116 in the stack, smaller than I remembered putting in there.

I'll up it to a 125 for the next test and see if that doesn't get the temps down below 300 for the higher-speed runs.

Anyway, CHT gauge=very useful, and confidence-inspiring!
Ossessionato
73 Rally, 74 Rally, 76 ET3, 80 P200, 06 PX150, 65 Li225 Silver Special, 86,95,96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3616
Location: Oceanside/ SF
Mon Jun 22, 2020 11:23 am quote
Check your PMs.

The other thing, do a search and see how much lower temps are mounting it to the studs vs spark plug. Vader typed something up back in the day.
Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and new to 2018, '66 Blue Badge Smallframe
Joined: 30 Nov 2011
Posts: 7658
Location: Victoria, Australia
Mon Jun 22, 2020 6:39 pm quote
yackee wrote:
When I got home I did a bit of research and those temps sound OK, but maybe a bit higher than they should be.
Very hot for cast iron.

Stud placement is a lot slower to react than under the spark plug - probably 95% of the temp readings you'll find on here are from under the plug. And the difference is significant, in the range of something like 50 degrees iirc. Will try to find the info.

Edit - I recalled incorrectly.

But anyway - good to know the actual difference - more info here -
CHT Location
Ossessionato
2015 GTS300, 1974 Primavera, 04 Ninja 250
Joined: 04 Apr 2013
Posts: 4426
Location: San Diego, CA
Thu Jun 25, 2020 2:07 pm quote
On my P I used an extension for the TTO and ran it up the tunnel, into the area behind the horncast, and then out the tunnel where the key cylinder is (there is a nice gap there on a 1980 P200). Then I ran it down to the top of the toolbox. Worked a treat.
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