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Right here goes, I will attempt to document the strip down & diagnosis, believe me, it won’t be as quick as Fastbob’s sterling ER5 job.

The reason I’m doing this is that the Trophy went to a local workshop to have the fuelling sorted as it’s got after market pipes & foam pods instead of an air box.


However it was diagnosed with a slipping clutch, oil leak ( only under load) & 59BHP - mainly due to the clutch slip.

I then got them to do a compression test & this was the result:

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While the leak down test results weren’t too bad, the compression should be around 150psi, also there was only a small uplift between dry & wet tests. Armed with this information I’m going to have a look inside the engine & see what’s going on.

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So here is the bike in a dingy but relatively dry Coventry garage.

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And armed with the Haynes Manual as a guide I will commence.

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According to the manual could do this without removing the engine but having spilt petrol over it It needs repainting, so out it will come & onto the bench.


Which will require a little tidying first.

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Seat unit off ( bubble wrapped & stored with its fixings taped to it) & -ve battery connection undone.

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So what's the actual plan ? 0.5 over sized pistons and a professional rebore or maybe just new rings and a hone ? I've got a valve spring compressor and a honing tool if you want to borrow them . They're just Machine Mart stuff but they do the job .

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So what's the actual plan ? 0.5 over sized pistons and a professional rebore or maybe just new rings and a hone ? I've got a valve spring compressor and a honing tool if you want to borrow them . They're just Machine Mart stuff but they do the job .

 

Thanks for the offer I may well have to take you up on that.

Not sure until I get into it .... mate of mine has pointed out that I might be able to fit Triumph 955 pistons and liners and take it to 1275cc .... bloody git, now he’s planted that seed I might have to give it proper consideration.

Hopefully it’s just a hone & new rings, but as you know, it could be a whole different ball game.

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Air filter pods off so I can get to the fuel tap / fuel hose clamp.

That green box has had a good wash out as it will house the carbs when they come off.

07992E5A-5ED1-4740-9FAF-5A9997A633D7.thumb.jpeg.86ef725f169fcb1ec3dc30508c8b1dfe.jpeg

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Fuel hose off - bit of wooden dowel with tape round it shoved in the end to stop any MORE fuel spilling out - doh !!

At least I had some rags down to catch it this time!!

EDC2D2FB-DDDA-4FDC-9971-6938550A1A9B.thumb.jpeg.3d9a81916c7d13d1a0be374f6966766b.jpeg

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So what's the actual plan ? 0.5 over sized pistons and a professional rebore or maybe just new rings and a hone ? I've got a valve spring compressor and a honing tool if you want to borrow them . They're just Machine Mart stuff but they do the job .

 

Thanks for the offer I may well have to take you up on that.

Not sure until I get into it .... mate of mine has pointed out that I might be able to fit Triumph 955 pistons and liners and take it to 1275cc .... bloody git, now he’s planted that seed I might have to give it proper consideration.

Hopefully it’s just a hone & new rings, but as you know, it could be a whole different ball game.

 

You can have my knackered ER5 barrells to practice your cross hatching on .

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Tank off, fixings bagged & taped to it.

Wrapped in an old clean sheet & into the cardboard box it came in.B262828B-55FA-4437-89F3-C23924506AE2.thumb.jpeg.d24b0ff6026767daa1f3206b69cf5fa1.jpeg

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Engine oil filler cap removed to allow sump to vent.

BC51281A-DF93-488B-A121-ABDD78F4E2D1.thumb.jpeg.ccd0ab245075db14449db89b0304eb56.jpeg

 

Oil drain plug

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Oil ... I added new oil and it certainly didn’t go in that colour !! Can’t see evidence of water ingress & it’s not milky, more burnt, probably caused by the over heating due to lean fuelling.

38A25926-112B-47CF-B6D7-07A3F6DF6BB4.thumb.jpeg.1af35c36d17818c1b2abfb3e33e3ae14.jpeg

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Radiator cap removed to allow cooling system to vent


Coolant is now over flowing from the rad neck

8B848B0E-BB94-4C52-9AB5-FC8CE5277867.thumb.jpeg.c781a290c417fa9788e5a8506cd49120.jpeg

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Lowest point of the cooling system ( looks nothing like the pic in the Haynes manual.

0021FCD2-A7CF-4337-83CA-3A9BCDE49890.thumb.jpeg.037acaf24dd8728b5e79a772c348f694.jpeg

 

Needs this bracket undoing from the block to separate the hose.

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Again not in the Haynes !!

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Haynes Manuals are hit and miss . The ER5 one is excellent but my Sportster one is incomprehensible shite .

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As a fellow trophy owner following with interest. You know there is a FB trophy group full of wisdom...

Do you mind if I share this post there?

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As a fellow trophy owner following with interest. You know there is a FB trophy group full of wisdom...

Do you mind if I share this post there?

 

No worries about you sharing it, I’m not on Facebook so unfortunately can’t partake of their wisdom, If I get stuck would you be ok to pass on a few Q’s ?

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As a fellow trophy owner following with interest. You know there is a FB trophy group full of wisdom...

Do you mind if I share this post there?

 

No worries about you sharing it, I’m not on Facebook so unfortunately can’t partake of their wisdom, WHEN I get stuck would you be ok to pass on a few Q’s ?

 




Fixed

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Cooling fan switch disconnected

6EC0E8C4-EF83-416A-9E2A-AA9631C9E84E.thumb.jpeg.26762d910ea51379a09169981c1d5e6e.jpeg

 

Cooling fan harness disconnected

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Horns disconnected - both sides ( Not standard fitting point, but looks ok on the radiator)

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Bottom fixings removed ( Both sides )

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Top Fixings removed ( Both sides )

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Radiator is free .... Oh no it’s not says law of Sod!! The fan harness is hooked up & you’ve forgotten the expansion tank hose !!


Radiator off, emptied, wrapped in an old tablecloth & stored with the tank.

 

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Keep meaning to get some gloves when doing this kind of thing 😬

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Does anyone remember the long thread on here where a guy stripped his Triumph down and then kind of lost interest or something and put it back together again without actually doing anything ? I'll have a dig later .

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Right the side stand needs to be removed next.

Top side stand bracket mounting removed

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Side stand switch connector undone

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Gear change linkage rod undone & moved to allow access to lower engine mounting bolt that also holds the side stand

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Lower engine mounting bolt removal - what Haynes don’t say is that you need 6” long fingers & the dexterity of Dynamo to get to the nut at the back.

It’s hidden by a plastic plug.

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And remove the side stand .... but no, what Haynes failed to say is that the harness routes behind the water pump & the bloody connector doesn’t fit through the gap !!

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Water pump loosened & withdrawn a tad releasing the connector, also need to remove the water pump upper hose cover to wiggle the water pump out.

Water pump

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Hose Cover

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Side stand removed & stored in an old shoebox.

Hose cover wrapped & put with tin with other fixings ( danger of this turning into a biscuit thread 😁)

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Watch this space ( or not ) for the next instalment.... removing the exhaust oooooooh

Edited by Mickly
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