Trying to identify year of C90

[Tom1989]

Hello all,
Im new to the forum, I currently have a Honda S90 and have now purchased a Honda C90 to restore. I have got the bike running well, just need to buy some parts to get it up to scratch. My question is about the frame number on my bike, before I buy any parts I need to find out what year my C90 is. Can this be identified by the frame number? I think its an 80s C90 but could be earlier, the frame number is C90-5132182
Thanks
Tom

[wightegi]

C90 51------ started in 1976 so not an 80s bike.

[Tom1989]

Thanks for your reply,
I found a website that suggests if the vin number starts in 51 then its a C90Z-Z which would be 1979-1981? Not sure how accurate it is. My main reason I would like to know is so I can get the correct parts. I know with my S90 that the parts differ quite a bit depending on the year of the bike. The bike is about 80 percent complete but some parts also need replacing!
Tom

[wightegi]

Have a look at Boo`s guide viewtopic.php?f=11&t=1098

The main thing is that most parts are the same all the way through the main change was with the gear shift pattern and position of switch gear.

[Tom1989]

Thanks for the link. From what he mentions about the gearing being different I should be able to at-least know if its a C90Z2 or a C90ZZ. Ive only just got the engine running so haven't actually checked the gearing. But yeah as you said both models have the same parts. Thanks!

[wightegi]

Bearing in mind they built 30,000 a month yours is probably not a Z2 but just a C90 built up to 1977.

[Tom1989]

Just noticed on the engine it says C90E but that could have been added to the bike later, it’s definitely got all the features of a 70s C90

[Tom1989]

I know more modern C90s take synthetic oil, but would my one take mineral oil? I think the previous owner said they filled it with synthetic but I’ll get that changed if it’s not correct!
Thanks

[wightegi]

Any motorbike oil will do, but if they used synthetic stick with that.

[Tom1989]

Now that I have done Vin to Reg and found the numberplate number it shows that the bike is in fact a 1978. Thanks everyone for your reply's