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Vintage Vespa Forum

knock knock... conrod big end dead T5

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kajtek Ashley Billimoria
Nice, PACA, France   FRA
Hi all

I own an 88 e-start T5. A few months ago, while riding, bike starts to get nosier, knock sound coming from engine, then the engine gave up. Long push home and parked its as couldn't face what was to come...

Fast forward to now, I kicked it over and it started again, but knocking sound really bad, and metallic. I pulled the head and cylinder to see what I could see, with the cylinder off i moved the piston/conrod around and, wow, so much movement at the big end. literally 2-3mm of play plus twists a bit.

So the big end bearing has obviously eaten itself. Now Ive had engines apart a bit, never a vespa but after looking online seems I only need a flywheel lock and puller to get at the crank, then undo it from the clutch side and it should pop out. No big drama.

But... the crank is obviously pressed together and balanced and aligned etc, something i definitely couldn't do. I couldn't find a replacement bearing online but SIP do a conrod kit:

https://www.sip-scootershop.com/en/products/conrod+kit+pa+for+vespa+t5+_24096000

is it normal practice to replace the conrod/bearings or do people generally just replace the whole crank?

https://www.readspeedscooters.com/products/vespa-t5-crankshaft-1296-p.html

any advice appreciated!!!!

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