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1981 CV80(BELUGA/RIVA)

 
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Mycveighty
Junior Wrench


Joined: 25 Apr 2011
Posts: 1

PostPosted: Tue May 10, 2011 2:24 am    Post subject: 1981 CV80(BELUGA/RIVA) Reply with quote

Good day/evening all !!
I am trying to put a parts list together for upgrading my brothers Yamaha.
I know the exhaust will be a custom item(flange/cut/angle etc)

Given this is the 81, is there an intake manifold and carb I can get that will work on this?
I don't mind getting the parts, just want to make sure its working!
V-belt, I will order from the dealer(unless there is something better?)
Replacing the roller weights.. I know what weight, but not sure.. how do you choose the correct size or manufacturer?
Soo many questions.. Smile

Any suggestions on parts suppliers? I had emailed a few, but no response.
Thanks in advance !!
S
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DandyDan
Site Admin


Joined: 17 Oct 2007
Posts: 1076
Location: Victoria, BC

PostPosted: Thu May 12, 2011 4:44 am    Post subject: Re: 1981 CV80(BELUGA/RIVA) Reply with quote

Welcome to the site Cool

I haven't found an intake manifold/ carb combo that fits on the '81 CV80. The trouble with the early model CV80's is that the intake manifold connects to the engine case way pretty far back and this spot is pretty confined. There isn't a lot of clearance for a bigger carb. My CV80 was the same intake manifold as yours, but I got the cylinder/exhaust/reeds/piston for the late model CV80 and bolted that top end on. The later model CV80's have the intake manfold connecting to the top of the cylinder, so you've got a lot more room to connect aftermarket parts. With that setup, I then used a modified Yamaha Jog Intake and OKO 21mm carb. I believe there are some good pictures of it on the site in the performance mods section.

I'm sure there is something that works in your stock location if you get creative enough and/or look hard enough. As i recall, other people have done it, so have a browse around this site.

For the belt, one member in Europe found another generic belt that fits and I think he posted up some info, but I can't recall it off the top of my head. I think you're likely best off to grab a stock belt, but first you might want to pop the drive cover off and see how wide your belt is now to see how badly you need a new one.

For rollers, you need to get the size correct. The CV80 uses 15mm x 12mm. The weight is your call. The stock weights are 10.3g and I've gone as light as 4g which gave me good acceleration but a bit lower top end. Something around 5-6g might be good but you might need to try a few to see what works best for you. I had a bunch of other mods at the time (exhaust, big carb, reeds etc). Manufacturer doesn't really matter. You can buy weights off of eBay or from any scooter / motorcycle shop usually.
Here's a good thread on this:
http://cv80.phpbbweb.com/viewtopic.php?t=107

For parts suppliers, it's mostly just eBay and Yamaha dealers....or maybe a junk yard if you get lucky. Try searching eBay international instead of just USA.
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