87 CV80 fixen' up questions

[brock915]

I noticed that the side cover tabs on my left side cover broke off. These are the upper tabs behind the seat above the rear wheel. Are these necessary, has anyone fabricated new tabs? I think there are two clips that are supposed to hold the two side covers together, I noticed you can order these clips from Bikebandit.com but not sure if it is worth it.

[csfieldmusic]

You will need the screw clips. I guess u could try to use the screw bolt, a nut and a washer but I would order the clips. They are cheap and would prevent further damage to the covers.

The plastic tabs are needed but not required. You should be able to fabricate something to make it work.

Example....

My Sons Honda NH80 had broken tabs on the side cover. I was able to use some thin plastic and super glue to repair it. This worked ok for a bit but I think it is broken once again.

I was able to get the cover to stay on good using the screw clips. There are 2 on the NH80. I also found a nice place on the bike and drilled a small hole so I could use a screw, washer and a nut to hold it in place further.

If you do this just make sure you drill the hole where you can get your hand behind the cover so u can install the washer and nut. I will try to take some pictures of how I did it to give you and idea. I have nothing better to do for the next few weeks!

Still looking forward to hearing more about your Riva 80. The Riva 125s are my favorite scooter.

[brock915]

Here is the link to the schematics I am talking about http://www.bikebandit.com/houseofmotorcycles/1987-yamaha-motorcycle-cv80t-side-cover/o/m7059sch229309 I am referring to 7 and 8.
I am planning on working on the scooter tonight for a few hours, while the wife is away. I plan on cleaning out the stator, draining the trans oil, checking the belt, maybe pull the throttle cable off and soak in some lube, to see if it will fix it. The throttle works, but it doesn't spring back to 'no throttle' I have to manually rotate it back to 'no throttle'. I am also probably going to go through all of the electrical plugs, clean, apply some dielectric grease. I got my Start light to work again this way. Right now my blinkers and brake lights don't work. I replaced the brake bulb and the driving light works now. Checked rear blinkers and they are fine, so it is probably the flasher relay or something like that. It needs a good once over anyway.
Just ordered new tires and tubes today, should be here next week. Battery, air cleaner, front brake cable and rubber grommet for left cover are on the way and should be here next week. Very exciting!

[csfieldmusic]

That is exciting!

For the flasher relay if you need one....

I was able to get a universal one from the auto store for a couple of bucks! Works great!

You may need a good battery for the signals to work. That is normally how it works.

If you have spark, I would leave the stator alone.

[brock915]

I thought about that, maybe not enough power for the blinkers because of the low wattage produced by the generator and the underpowered electrical system, I was thinking of installing the 3w bulbs replacing the 23w bulbs.
Was just going to check the stator for rust and cleanliness, clean if necessary.

[brock915]

Worked on the scoot tonight, fixed my throttle problem, just had to clean off the bar and the inside of the slide and spray with silicone, works like a champ now.
Discovered the clutch air filter was disintegrated, just old, cleaned out and am ordering one.
Also noticed one of the leads to the rectifier is broke off so need to order one of those as well,
Gapped the spark plug to .026 and notice an increase in power, the gap was too big before.
Took it for a little spin around the neighborhood after work, died at a stop sign but restarted but only when giving it a little throttle, adjusted the idle but then when it cooled off and restarted later, idle was really high, adjusted again and had same problem where it would just die after awhile of idling. I was thinking this could be because I currently don't have an air filter in it and it is this free flow, would not work with the current jetting, any ideas?

[csfieldmusic]

could be the lack of air filter.

I would check fuel flow to the carb.

I would also clean carb again.

Jetting should be stock and work well. Could be a little clogged.

Have u installed a fuel filter? Could be getting specs of crud in the carb from the tank or possibly a small piece of the old air filter.

[zeonsredcomet]

YEAh running with no air filter is a bad idea.

Make sure the fuel sending unit is good. You can do this by dissattaching the lines from teh carb and making sure the fuel doesnt just pore out it should have good vacuum and only a few droplets out.

how was the condition of the stator out of curiosity?

[brock915]

The flow to the carb is fine, when tubes removed, it does NOT pour out so the vacuum is fine. Cleaned out the petcock and the filter built into it, hardly any debris in it. I really think it is the lack of air filter.
Well, I attempted to remove one screw from the stator cover, couldn't and then just gave up, don't want to strip the screws. It's like I can't push on the screw hard enough without pushing the scooter over.
The gas tank is totally clean, this bike must have been stored indoors forever with a full tank of gas. I have had so many old bikes with rusty tanks, and it really sucks!

[csfieldmusic]

Sounds like the bike is sparking fine anyway. I would just leave the stator alone.

I would focus on making sure that carb is clean, getting an air filter and she should run top notch.

It is possible some of the old foam filter was sucked into the carb. Give it another good cleaning while you wait for the filter.

[brock915]

Oh I know the carb was dirty. The airbox, carb and intake were all STUFFED with fiberglass insulation as well as other cozy mouse debris. The air filter and front brake cable should be waiting for me when I get home, and it is supposed to be in the 60's this weekend, perfect scootin' weather. I will try the air filter first, and clean the carb again if necessary.

[brock915]

I totally forgot cleaning the pilot jet on the 1st clean. Installed filter, front brake cable and cleaned pilot jet as well as the rest of the carb, she is like a rocket! 45mph on a slight incline, wow, that is fast on this little bugger! Thanks for everyone's help. Battery tomorrow and tires next Wednesday. She's comin' along.

[csfieldmusic]

Whoo Hooo!

Sounds like u got it!

I figured it would run around 40-45.

How is the acceleration? Peppy I am sure!

[brock915]

Yes indeed! Acceleration is great, I love the cvt, it just gets up and goes, a lot of fun. It is peppy. Makes me wonder about the lighter rollers, I am sure it's hard to keep the front wheel on the ground with 4g rollers. Thanks again cs, I appreciate your motivation.

[csfieldmusic]

Believe me....

You want that wheel on the ground!

It is possible your old rollers have flat spots on them. Changing them out could help performance a little. Especially with a new belt.

[brock915]

Changed the fuel lines, cooked the exhaust pipe, threw it on the fire for awhile, to clean. Oh and did some plastic fender and turn signal repair due to my wife's wreck. She dumped it down the street. She is OK, has some road rash and bruises and her ego is hurt, but I think she learned from it.
I have a rectifier on order, I can bypass it by plugging the two leads into each other and every thing works. What kind of harm can this cause, does anyone know?

[csfieldmusic]

Sorry to hear the wife crashed the scooter.

I am glad she is not hurt very bad.

What is up with all the wrecks lately?

Tell us more about cooking the pipe.

I had read about this and even posted the idea off cooking a pipe on a grill to burn out the carbon build up in another thread.

Do you have any pictures of this process?

It sounds like your scooter is coming along very well. Keep up the good work and keep us up to date.

[brock915]

Well, I have a fire pit, got it going good, removed the exhaust gasket, then through it right on the fire, turned it over a few times. At one point there were some good flames coming out of it, nothing bad though. I must have had it on there for 2 or 3 hours. I could here the oil crackling inside even when I was done, I figured it was good enough and I wanted to take a spin before it got dark. Let it cool, which only took maybe 30 minutes, reinstalled gasket and then the pipe, works fine. I want to repaint it now but it did clean it up nicely.
The grill is not a bad idea. Not sure how hot the propane gets, you certainly don't want to melt your expensive pipe.
At one point it was glowing orange so it did get pretty hot.

[brock915]

Received the battery last night, installed acid and charged. Installed, which was a tight fit, started right up and it charges, tested with multimeter. I attempted to solider the broken lead back on to the rectifier, but of course id didn't hold. I have one on order, but I think bikebandit.com is having a hard time getting one for me. I also discovered the signal relay is no good, over $70 for one of these, ouch! CS didn't you say you found one somewhere, any suggestions on where I can get one?

[csfieldmusic]

Yes,

You can get a generic flasher relay at the auto parts store. Just take your in and tell them you want a generic one to replace the one from your scoot.

I paid less than 3 bucks for the one in my Sons Honda nh80.

[brock915]

Received new tires, no one in my area changes tires, not even this scooter shop. So I finally got the tires off of the rims, discovered there was lots of rust on the inner part of rim, removed rust and used this new rust neutralizer stuff by Rustoleum. Chemically neutralizes the rust and turns it into a black paint-able surface, great stuff.
Anyway, I didn't even attempt to install new tires yet, too cold and knuckles were tore up pretty good. Took the new tires inside to warm up then I will attempt maybe tonight, and it is not going to be easy.
It is very hard to find a tire iron set anywhere around here, except online, but my obsession must be immediately satisfied.

[brock915]

Got the tires on the rims, not too bad really, used some liquid dish soap and big screw drivers. Now having a problem setting the bead, need to lube the whole bead and try again.

[Blackbomber]

Obvoiusly line up the dot on the sidewall with the valve stem. If this is a tube deal, you are probably out riding as I type this. If it's tubeless, wrap a tie down strap around the circumference of the tread, and cinch it down enough to spread the beads to the rim. Hit it with your compressor, and it should seat. I've never tried this with a manual type of compressor, but I imagine it might work if the bead is seated tight enough. If that fails, a trip to a filling station would be worth the time. There is an old off roader's trick of filling the tire with a bit of propane, and setting it off with a match (I'm guessing gasoline was also used at some point). I'd be careful about this on a small tire such as a 10" scoot tire. Use VERY little propane if you do it. Maybe even a few seconds from a butane lighter would do it. I have never tried this, but would attempt it in a pinch. Safety glasses and gloves please.

[Blackbomber]

Oh, for what it's worth, I did my own tires on my VW Beetle using a 175psi compressor, no strap, and the tires were dinky Smart Fortwo front tires. The local Town Fair Scammer installer couldn't figure out my portowalls, so I had him break the outer beads, and I did them myself. The lube was crucial, and it took three or four attempts on the first one. From now on I'll install ALL my own tires, and bubble ballance them. I ballanced my 235/70/15 Jeep tires on my own, and they feel just as good as a dual plane electronic job. Plus they look better, because I put the weights on the inside only.