[singhg5]

Recently I had purchased a Koso Universal analog tachometer for installation on my G5. It turned out to be much longer project. The tach would pick up the signal but did not display correct RPM and was erratic, non-responsive to engine speed and throttle position. Many ways were tried but nothing worked.

When all options were exhausted, I contacted the company headquarters in Canada and sent them some pictures and description of what was happening. Their technical manager replied that it needs an ADDITIONAL device called RPM Signal Adapter to resolve the problem.

To my surprise I received that in mail in a few days, courtesy of the company .  Well, it was attached to tach and the thing is working as it should.

This tach has water temperature sensor also. A separate ring-type sensor for spark plug can be ordered, which I did. So now I can say for sure that the cylinder head temperature reached 253F on my last test run.

There are two videos - they contain different information.

The first one is about features, functions, operation and specs (power consumption) of this tach -

http://www.youtube.com/watch?v=huCFMM4nvlM

Second one is actual trials and tribulations of installation until I received the correct parts -

 http://www.youtube.com/watch?v=3hMnm08CKOU

[singhg5]

Cylinder Head Temperature - 

[gashousegorilla]

 Yeeee Haaa is right !      Man.... That was a head scratcher !  Excellent Singh, thanks for doing the leg work. 

[High On Octane]

Very nice!  What is the model #?  I think I just found my next toy. 

[singhg5]

Yeeee Haaa is right !      Man.... That was a head scratcher !  Excellent Singh, thanks for doing the leg work. 

Thanks GHG !

Very nice!  What is the model #?  I think I just found my next toy. 

It is model number BA551B23 of Koso.

They also have a Black Dial BA551B22.

Here are the links -

http://www.kosonorthamerica.com/koso/shop/tachometer-motorcycle_gauges/gp-style-tachometer-with-water-temperature-8/

http://www.kosonorthamerica.com/koso/shop/atv/gp-style-tachometer-with-water-temperature-7/

[mattsz]

http://www.youtube.com/watch?v=3hMnm08CKOU

Singh - there are a few moments in your video when I hear an odd "whining" noise.  A couple of times, it seemed to happen right when you turned the key and the fuel pump should have been powering up, for example at 8:40.

Is that noise coming from your bike?  If so, do you know what it is?

[ace.cafe]

Nice!
Having cylinder head temp displayed is awesome!

[Barnone]

I have a CHT gauge on my DF250RTB and my Ural.
http://www.ebay.com/itm/TRAIL-TECH-TTO-DIGITAL-TEMP-TEMPERATURE-METER-GAUGE-SPARK-PLUG-SENSOR-14MM-/191163646045?pt=Motorcycles_Parts_Accessories&hash=item2c823dc05d&vxp=mtr

Tach/hour meter also off ebay.

[singhg5]

Singh - there are a few moments in your video when I hear an odd "whining" noise.  A couple of times, it seemed to happen right when you turned the key and the fuel pump should have been powering up, for example at 8:40.

Is that noise coming from your bike?  If so, do you know what it is?

It is fuel pump noise. The reason is that every time fuel tank was taken off, the gas line was disconnected and then re-connected leaving air in the fuel line. The first time the ignition key is turned on, the pump pushes fuel through air-filled lines. This is its normal sound. It does not happen after all lines are filled with fuel.

[singhg5]

Nice!
Having cylinder head temp displayed is awesome!

Thanks Tom.

I really like it. Yesterday, it was hot and in a jammed traffic the engine temperature reached 266F. I have not seen that high temperature before in the last few days I have used it.  Fortunately once bike starts moving at normal traffic speed, its temperature hovers between 250 - 260F.

What engine temperature would you consider SAFE and at what temperature should the engine be turned off to cool, in case such a situation arises.   

[FastDoc]

All I can extrapolate is from airplanes, which are also air cooled low compression (8.5:1, same as the RE) pushrod engines.

Redline for a Lycoming is typically 435 degrees, and I don't operate the CHT's over 400 for more than a few minutes or when my life depends on it...

I aim for temps less than 375 so I suspect that at it's hottest your RE is doing fine.

[singhg5]

All I can extrapolate is from airplanes, which are also air cooled low compression (8.5:1, same as the RE) pushrod engines.

Redline for a Lycoming is typically 435 degrees, and I don't operate the CHT's over 400 for more than a few minutes or when my life depends on it...

I aim for temps less than 375 so I suspect that at it's hottest your RE is doing fine.

It is a coincidence that ACE.CAFE is discussing the same issue in another thread that around 300F aluminum head starts to soften that can sink / move valve seat. He also mentions that 380F is way TOO HOT, by about 100F.

Good thread 'Engine Temperature & Valve Clearance' in iron barrel section -

http://www.enfieldmotorcycles.com/forum/index.php/topic,19721.0.html

[FastDoc]

Like I said all I knew was extrapolated from airplanes...

BTW they are also aluminum cylinders and heads, but likely of a stronger material.

The data on airplanes says that the metalurgy changes at temps over 400.

[singhg5]

There was a question on the configuration of tachometer mounted on the handlebar. In upright position, it is easy to see the tach dial when riding and also it does not interfere with ignition key. I had tried it two different ways -

https://www.youtube.com/watch?v=-P2MvJK9Ens

[AussieDave]

Great work Singhg5! I think this is a great addition to the machine . Potentially stops disaster before it can strike! May have to put this on the to do list. Cheers.