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[Barry_Q]

The different engines are easy to sort out. The AVL has the same looking bottom end as the iron barrel, but has a different cylinder head. The AVL head is higher in length and has the rocker box caps in a different place. The AVL lump has a 5 speed gearbox as standard, whereas the iron barrel engine has a 4 speed. It's easy to get confused if you don't know the differences.

[Norm]

Barry,
There is a lot of iron barrel Enfields out there with 5 speed box to add to the confusion, that started with the Bullet sixty5

[Barry_Q]

As with all things, there are exceptions to the rule which muddies the water. The Sixty5 (as far as I'm aware) was the first model to be fitted with the 5 speed box as standard. Then there's the bikes that had a change from 4 speed to 5 speed boxes (I'd like one myself).

[2stageturbo]

Ok guys. Thanks for all your advice and comments. It's helped my get an understanding of what i'm going to be up against owning this bike. I managed to get in touch with our good friends here at Hitchcocks and i have been advised the parts book i require is 142145/03a. This is for 2002 - 2005, 350cc/500cc Enfield home market book. Whilst not everything will be a 100% match. They said this is the best book overall as no book was ever produced after this ! So at least i can get a look at a book, that i can be confident has accurate parts for my bike. I will report back with an update once i get the book and order some parts. Thanks. There's a long story behind the 2stageturbo name Alan R ! I've no speed aspirations with regards the Thunderbird. I nearly hit 70mph on a downhill section of motorway last year ! But hey, Thats not what the Enfield experience is about