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slow beluga80cc and some q`s about the carb, progress update

 
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bombaklut
Junior Wrench


Joined: 03 May 2015
Posts: 7

PostPosted: Sun May 03, 2015 10:15 pm    Post subject: slow beluga80cc and some q`s about the carb, progress update Reply with quote

Hi

I'm new here but read a lot of the threads in the forum before becoming a member and realised theres a lot of knowledge here.

i just got a hold of a 80cc beluga probably the early model.
i knew before i got it that it weren't a fast bike and even though its really nice to go for a cruise with it it would be nice with a little bit more power.

It won't run faster then around 30 mph and thats after apx 1 min on flat ground, if its a little bit uphill it will take even longer and it won't go faster then 20 mph.

today i was trying to calibrate the carb but could only find one adjustable screw, which seems to be the air screw (pointing towards the variator). i tried both ways and nothing happened!? and other than that i couldn't find anymore screws accept the one att the bottom of the carb, but that seemed to be the drainscrew to empty the carb from fuel. does this make any sense to you? or am i missing something? is there something that can't be reached less i remove the carb entirely?

the bike is as far as i know other than a new exhaust with expansionchambre all stock and no tune.

it always starts on the first kick when cold and within five kicks when warm.
i can tell it never really revvs out until about 30 mph which is the top speed. will lighter waits make a difference (in a good way) here?

its very weak as well and heaving a passenger don't seem to be an option at the moment.

so in short: it lacks acceleration strength and top speed even for a beluga,
other than that theres not really any weird noises or anything

any tips would be greatly appreciated.


Last edited by bombaklut on Sun May 10, 2015 5:23 pm; edited 1 time in total
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bombaklut
Junior Wrench


Joined: 03 May 2015
Posts: 7

PostPosted: Sat May 09, 2015 6:52 pm    Post subject: uppdate! tried some stuff. Reply with quote

hi


first of all i found out the my beluga is from -83 so probably the later version since I'm from sweden, plus it says mikuni 16mm on the carb. a good thing i guess but even more of a puzzel to figure out why its so slow.

so i tried som stuff,

nr 1; air box, while running (on stand) i pinched a screwdriver between the carb and airbox and got an positive response(it revs better and felt more powerful some how) so i open the filter box only to find it empty??. i took it for a quick spinn, felt more powerful but not much faster. i bought a new sportfilter but haven't tried it yet since a new problem occurred with the kick.

nr 2, the kick. when starting the scoot the other day the kick wouldnt go back upp by it self and had to be drawn back by hand. after pulling it back there was a razzling sound ( like gearing a car with out the clutch. since i knew something wasn't right i took the variatior apart and saw that the kickshaft had slid in towards the fanshive and the spring was jammed underneath the half-moon shaped gear preventing it from geting back in the right position. i managed to get it back manually for the moment but only for a couple och kicks then it slides back in. i think theres a washer missing (one of those you need a special pliers to remove or install) ill get one of those and and see if its the right solution.
i have some pictures of this but i don't know how to post them!?

nr 3 v-waights. while having the variation open i checked the waits and they were everything but round, i changed them into 5,5g, i think they were a bit light though, i took it for a ride and the acc was better but it kinda stalled out for a bit around 30 kmh before it geared upp, top speed were still about the same i think. bought som new 7 g waits and will try those soon.

think ill open the intake manifold tomorrow and see how it looks, if theres anything shrinking the airflow. other than this I'm kinda clueless as to why its so slow and weak, barely making half of its supposed topspeed.
any other suggestions?

i looked down the carb when i had the airbag removed and it looked clean.

how do i post pics?
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bombaklut
Junior Wrench


Joined: 03 May 2015
Posts: 7

PostPosted: Sun May 10, 2015 6:42 pm    Post subject: progress update Reply with quote

i don't know if anyone is still active in this forum but ill keep posting my questions and experiences and maybe it'll help someone else at least

So i tried some more stuff on the beluga today,
fisrt i delt with the kick, got some circlips from the hardware store, first i had too get the spring and everything back in place of course which took me about an hour at least, the spring just kept popping out of pos and unwind, ones i figured out a way it wasn't that hard though, let me know if you have the same problems and want some tips.

when the kick was fixed i i put the variator back together and took a ride to test the 7g v-weights , there weren't to much dif so i put the 5,5g back in.
the 5,5g weights in combination with the sport airfilter gave me significantly more power acc and revs good upp till about 30km/h. but now a new issue has evolved, since the v-belt has never been all the way upp one either the primary shive or on the clutch side theres some rust there and it seems this caused the belt to start slippin a bit. i didn't have the right tools to remove the clutch and sort it out so thats gonna have to wait till next time.

when riding home i got it to do about 55km/h which is a new best so thats in the right direction.

i think its running a bit rich cause theres pretty much smoke, i might just put some premixed fuel in the tank and disconnect the hose from the oil tank if i can't figure out the right way to adjust, any one know? is it this you adjust by moving the clip on the throttle needle?

one more thing! i removed the intake manifold and checked the reeds and two of them looked a bit loose, they weren't tight against valve, would this make a big difference?
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robeye
Junior Wrench


Joined: 19 Oct 2013
Posts: 9
Location: Grand Forks, BC Canada

PostPosted: Thu May 14, 2015 2:15 pm    Post subject: Reply with quote

Hi... ya this forum does not have much action... every year I remove my carb and clean it .. seams to be the only way to get the Yamy to run good.. It's a small carb.. and easy to remove. but you need to know where each hose goes.. These Scoots are not fast... 30 is good.
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1982 Cv 80..My Blog.. www.robeye.blog.com
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elibowers
Junior Wrench


Joined: 10 May 2012
Posts: 12
Location: Philadelphia

PostPosted: Mon May 25, 2015 3:40 pm    Post subject: Reply with quote

I have a late model CV80 (US-Riva 80) from 1987. I have no issues getting to about 45 mph (72 km/h) on a flat surface. Its definitely more comfortable to cruise around at 35 mph (55 km/h), but its nice to have that extra kick for some busier roads. Also, carrying passengers and going up an incline is never a problem. To be clear, its definitely not fast, but I can easily keep up with traffic. My CV80 has 10k+ miles (16k km) and is all stock and original except for some 6g weights.

Does your scoot have a side stand? That's an easy way to tell if its a later model without having to measure the carb.

If it is a later model, you still have some work to do to reach its full potential. If its an early model, 55 km/h might be all you get without changing the carb and/or exhaust.

Oil Pump - According to the manual, this can be adjusted (page 2-6). If your CV80 hasn't been ridden in a while, it probably just needs a good ride through a tank of fuel to reseal the rings and reduce smoking. If you want to rule out the oil pump, disconnect it and use premix. If it still smokes, its probably the rings. Then you can make the decision to rebuild the engine, or just deal with it.

Keep posting your progress. If you don't have it already, you can download a digital copy of the service manual at this address - (http://motorscooterguide.net/Downloads/Downloads.html).
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Happy Scooting
1987 Yamaha CV80
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bombaklut
Junior Wrench


Joined: 03 May 2015
Posts: 7

PostPosted: Mon Jun 22, 2015 10:46 pm    Post subject: Reply with quote

iŽve only got the centre stand. but since i have the mikuni 16mm carb i figured i had the later version, its an -83 european version sold in sweden.

i realised that it leaks tons of air somewear around the sparkplug area, guessing thats a big powerloss so iŽll be adressing that issue soon as pos.

i spoke to a nice guy in an scootershop to day and he said my kundo exouhst/expansionchambre thing were some real shit that would kill any bike so iŽll have to try something else.

to be continued.....
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bombaklut
Junior Wrench


Joined: 03 May 2015
Posts: 7

PostPosted: Wed Jun 24, 2015 9:59 pm    Post subject: Reply with quote

ok ignore what i said about the air leak, its the aircooling. well you learn something new every day
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