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post #1 of 14 (permalink) Old 06-23-2019, 03:45 PM Thread Starter
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Coolant line routing question

My 06 955 Tiger's motor is in serious need of TLC. Cylinder number one is really low on compression and it burns oil like crazy.

I picked up on 02 955 Sprint ST motor and am planning on bolting it into place and seeing what I've got. I'll either be very happy or cursing loudly.

The 06 Tiger was a weird mix of 955 and 1050 parts but I think it'll all work out okay. The fuel rail is different but the injectors are the same, that kind of thing.

The crusty donor motor has different line routing.
I'm thinking I can just ignore the electrical connector on the donor motor and cap off the small line on the bottom.
Can anyone tell me if I'm correct?
I hope so as I think trying to graft a 955 Sprint radiator onto a Tiger might be a bit of a production.
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post #2 of 14 (permalink) Old 06-23-2019, 08:35 PM
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The electrical is a temp sensor. I believe the small line is a return from the bottom of water pump. You can get a tee and hook it up like the RS you have. Donít eliminate it, could cause cavitation behind pump. Doesnít it hook up on bottom of radiator from the st?

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post #3 of 14 (permalink) Old 06-23-2019, 09:23 PM Thread Starter
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The Tiger has the temp sensor up by the radiator cap so I think I've got that covered.

After work I'll crawl around under the bikes but I'm pretty sure there's nowhere for that small line to hook up to on the Tiger.
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post #4 of 14 (permalink) Old 06-24-2019, 06:07 PM
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You will need to remove the Thermostat from the Sprint motor (it's in that 'elbow' on the head - item 42 in the lower fiche diagram)

The small hose is from the bypass orifice in that Thermostat housing (that's not the pump @jer5ak ) for when the Thermostat is closed; so, sure you can just blank that off
(on the Tiger, the bypass hose is that item 35 from the Top fiche diagram below - in your Tiger image above that s the one coming off the rear of the T'Stat assy - the smaller hose)

And yes, just ignore the Temp Sensor on the Sprint head.


Tiger Scheme




Sprint Scheme

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post #5 of 14 (permalink) Old 06-24-2019, 06:24 PM
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One other thing to consider - so you're going to need to run a Sprint map - but not sure how that will blend with the Tiger Instruments*.

Edit - OK - a very quick study of both shows they are essentially the same - HOWEVER one significant difference is that on the Sprint, the Speed Signal is processed through the ECU; on the Tiger it is connected directly to the Instruments.

So one way to go would be to use a composite map, with Sprint map tables grafted into a Tiger base.
Because the sender is actually connected directly to the instruments, the speed will actually display correctly if you just used the Sprint Map as-is - the problem however is that you will have errors posted for both open sensor and open instruments unless you account for this.
The alternative would be to get another Triumph harness from which you can pull terminals/wires from the ECU connector and reconfigure the wiring from sender and to instruments to match the Sprint config

And the Throttle Bodies and Injectors (which are NOT the same) would need to come from the Sprint also (the heads are completely different and those parts are not interchangeable)

On that note, the headers aren't going to fit either
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post #6 of 14 (permalink) Old 06-24-2019, 06:36 PM Thread Starter
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Thank you so much!
I would have screwed up and had double thermostat and then would have been really puzzled for a bit...

I will have to take a tape measure to the headers out on the garage.

This Sprint motor is an unknown quantity so it's suck it and see, I suppose.
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post #7 of 14 (permalink) Old 06-24-2019, 06:44 PM Thread Starter
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The instruments...
I think you've just steered me to the correct course of action.

Pull the Tiger apart and see exactly what is going on with cylinder number one.
If that piston is cracked I'll be forever worrying if numbers 2 and 3 will follow suit and then will return to the Sprint motor.
Even though this is a 955 it is an 06 motor and the owner was from NYC and there was the ethanol issues the 1050s were having right around then.
It did come with the stock map if that means anything.

If it's just a scored liner from him trail riding down in Florida with it I'll forget the Sprint motor and will give this one a freshening up.

You know, you really help keep us from floundering around with our vexing problems!
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post #8 of 14 (permalink) Old 06-24-2019, 06:53 PM
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Quote:
Originally Posted by Steve Ford View Post
... I will have to take a tape measure to the headers out on the garage .....
I consistently use the parts fiche for things like this - the header gaskets are different, therefor the headers fit to the head is different.
No tape measure required

(the other resource I frequently use is Ebay images)

The problem is that the Tiger motor did not keep track generation-aly (is that not a word?) along with the other Triumph motors - other than the capacity, it really evolved from the 885 engine - the Throttle bodies for example and the cooling scheme are more like a first-gen Sprint (00 version)
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post #9 of 14 (permalink) Old 06-24-2019, 07:41 PM Thread Starter
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I meant for length to see where a set of Sprint headers would wind up on a Tiger frame. That would really suck to buy a set of Sprint headers and find out that they're about 2" too short for this giant monster. The frames are totally different so I'm not sure what would work on it.

I did not know that about the Tiger evolution but I know the 06 is a real mix and match thing as the 1050 was getting ready to come out. I also know that there is no sense in asking Triumph anything about the bike!

Oh well, pulling a piston out isn't the worst thing that could happen so I'll take it from there.
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post #10 of 14 (permalink) Old 06-24-2019, 08:09 PM
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Well you can always cannibalize a set of Sprint/Speed Triple/Daytona headers, cut off the interface to head and weld onto the Tiger. And the good part there is you don't need to find pristine headers, any old beat-up set will work for that purpose (and similarly with the ECU terminals if you go that route)
But sure, see where popping the head off takes you.
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