650cc Unit Rebuild Kit? - Triumph Forum: Triumph Rat Motorcycle Forums

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post #1 of 19 (permalink) Old 11-18-2009, 09:02 PM Thread Starter
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650cc Unit Rebuild Kit?

Probably a rookie question, but does anybody offer a "rebuild kit" for the 650cc engines?

It seems you can buy a "kit" that included the necessities for any vehicle engine out there, but I can't find one for a 650cc Unit.

Spare parts are never a bad thing and I figure that'll save me the trouble of identifying and ordering all the parts individually.

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post #2 of 19 (permalink) Old 11-18-2009, 10:40 PM
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Originally Posted by RidingDonkeys View Post
Probably a rookie question, but does anybody offer a "rebuild kit" for the 650cc engines?

It seems you can buy a "kit" that included the necessities for any vehicle engine out there, but I can't find one for a 650cc Unit.

Spare parts are never a bad thing and I figure that'll save me the trouble of identifying and ordering all the parts individually.
Man thats crazy talk,I've been rebuilding BSA A65 twins for the last 20 years and never found a part or reference that corresponds with any ''rebuild kit''The Triumph guys are gonna say 'what year',whats the bore size,etc.etc Hope yer wifes patient J.B.
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post #3 of 19 (permalink) Old 11-18-2009, 11:59 PM
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The parts books list several rebuild kits including gasket kits, rings & pistons, and a few others, however, there is no definitive "rebuild kit" per se, that lists the typical stuff.

Mainly because there are several types of "rebuilds":

-"De-coke" - top end carbon removal / major tune-up
-Valve job
-Ring Job
-Bottom end rebuild
-Total overhaul with good core componets
-Total overhaul after catastrophic failure

On a typical overhaul, I use:
-Complete gasket set with head gasket & o-rings
-5 piece seal kit (even those have to typically be ordered as 5 parts)
-Various fiber & copper washers for drain plugs and OPRV
-Tab washers for clutch center, alternator rotor & kickstart pinion
-Connecting rod shells & bushings
-Pistons, pins & rings
-Valves & guides
-Main bearing pair
-Transmission bearings & bushings (about 8 parts, I think)
-Sludge tube & Allen-slotted trap plug
-Carb kit(s) with new floats, needles & seats
-Clutch fiber plates & springs
-Primary chain & adjuster pressure foot
-Spark plugs

I'm not sure, but probably leaving out a few things...

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post #4 of 19 (permalink) Old 11-19-2009, 12:03 AM
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... not to mention (most likely) front sprocket and chain, (less likely) rear sprocket, and brake shoes front and rear.

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post #5 of 19 (permalink) Old 11-19-2009, 12:04 AM
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Hey, my list was ONLY the engine!

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post #6 of 19 (permalink) Old 11-19-2009, 02:45 AM Thread Starter
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Adding all this to the grocery list...

'67 Triumph Bonneville (Ruby)
'68 Triumph Tiger (Livia)
'07 Bonnie with Cargo Hack (Fanny)
'11 Ural Gear-Up (Boris)
'13 Husqvarna TR650 (Ginger)
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post #7 of 19 (permalink) Old 11-19-2009, 10:38 AM
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In addition to:
Possibly cams
Lifters/followers
tappet blocks
Cam bushes
pushrods
various fasteners
oil pump
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post #8 of 19 (permalink) Old 11-19-2009, 11:07 AM
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68TR6R, those parts you list are all core components, not typical replacement items.

I've never had an engine so clapped out that it needed new cam bushings. I've changed out a few for clients, but they typically get great wear on Triumphs.

It takes a LOT to hurt a cam, and the followers can have the flat spot re-ground 99% of the time, no need for new ones.

Oil pumps typically last many years as well...

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post #9 of 19 (permalink) Old 11-19-2009, 01:32 PM
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Good thread lads.
Couple questions: 5 piece seal kit - what seals are these GPZ?

ALso OPRV - is that oil pump ? valve?

I suppose the big variable (and why they dont put kits together) is whether any of the components are "over" standard clearances. E.g. piston, rings, crank bearings, bushings. Ive seen gearbox kits but never engine/crank kits.

Cheers.

Last edited by Kev_England; 11-19-2009 at 03:19 PM.
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post #10 of 19 (permalink) Old 11-19-2009, 03:09 PM
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See?

See? I told you these guys would be fantastic help!

The 'total rebuild kit' was the first thing I search on, because I too had saved a ton of cash going that route on some Brit motor car rebuilds, but part way through the tear down on the rusty 500 showed that it was only rusty on the outside. Inside there was minor wear on many components - so a 'kit' would have been overkill.

Gotta be hard working it all out 10,000 miles away - get home soon - the fun awaits : -)

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