The International CBX Owners Association

has one of you ever used NPR piston rings from TAS classicmotorsports http://www.ebay.com/itm/380393951853?it ... 23&vxp=mtr

i want to refres my top end and i'am in doubt shall i use oem or NPR

fred.nl

Welcome to the ICOA forum, Fred!

The CB900F and the CBX had the same bore. A lot of aftermarket companies sell the same piston rings for both bikes. Honda did not. I think the Honda original ring sets were slightly different in component contents. I always use dthe Honda sets. Don't know if they are still available, though.

Just installed a set in my 79, got them from Z1 enterprises. No problems with assembly, did not start up eng yet.

If I'm not mistaken, the Honda parts suddenly got a lot cheaper - Dave had priced out pistons and rings for a total of $600 recently. Don't rule that out!

N.

I think that the only matching piston/ring sets still available from Honda are 1st over. I'll check on the std rings only and report back. Was surprised at the price compared to most aftermarket sets being offered (current Australian and Far Eastern offerings on eBay excluded).

Dave

Looks like std Honda rings sets are still available for around $45/set. Also, to confirm Nils' comment, 1st over piston and ring sets from Honda currently list for just over $100 x6. Now this does not include wrist pins (which you should not need) or head and base gasket, or wrist pin clips. But a quality rebore job with all Honda parts for that money is certainly attractive, unless you want the performance increase from a big-bore.

Dave

Welcome to this great site, Fred.
Just a heads-up, a lot of people recently have had problems with Tas Classic Motorsports, a Google search will provide a lot of info.
Like rider3 mentioned, another source for parts is http://www.z1enterprises.com/
I have had excellent service and advice from them.

thanks for the replys
i know now tas is not any good
but are NPR pistonrings any good
has someone used them in their CBX, rider3 installed them but did not start his engine yet.
the NPR company looks sound to me japanse based with businessis all over the world makeing lost of automotive parts ( cars)
i only could find posts for car stuff on other forums (google)
not a thing about motorcycles

fred.nl

I have NPR rings from TAS. Got them within a few days of placing the order and at the best price out there...$98 for a set of 6.

Have yet to fire her up but the rings were all in spec.

I have talked to guys on other forums and they have been happy with the performance of the rings.

I have heard that NPR made the rings for Honda but I can't verify this.

Mike

well i ended up buying oem piston rings
to stay on the save side

thanks for the input

fred.nl