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Mighty Hercules - the story
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luke racin
Beluga Legend


Joined: 31 Jan 2008
Posts: 238
Location: Warsaw, Poland

PostPosted: Mon Jun 09, 2008 6:36 pm    Post subject: Mighty Hercules - the story Reply with quote

ok.. so I'm crousing down the street at 65 km/h or so ( Ithink even more possibly) when I suddenly feel my herc losing its speed... I had the throttle fully opend but it slowed down to 50km/h and thats it.. it wont go any faster and it struggles between 30 and 40 km/h

There are no leaks... nothing fell off.... So my guess is the carb needs cleaning... but why would that happen so suddenly? Oh and I can feel it chocke just a little.....
I will try to clean it this week I got my manual so it shold be ok... my question is if there is a fast way to clean it?? I mean maybe there is this little thing you have to clean on a carb and thats it... i remember my old car (fiat 126p.. if any one wants to lough ;P ) had this little thing in a carb you just had to unscrew and blow commpressed air through it and into the carb and that was it... Does a cv80 capable of a similar trick? if not I will folow the manual and the post on the forum and I should be all right...
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Last edited by luke racin on Thu Jul 10, 2008 7:07 am; edited 1 time in total
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john
Beluga Legend


Joined: 09 Nov 2007
Posts: 102
Location: Caledonia,Ontario,Canada

PostPosted: Mon Jun 09, 2008 6:42 pm    Post subject: Reply with quote

You could try carb cleaner through the idle screw and mixture screw and see if that dis lodges any crap. Probably something in the jet though.
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DandyDan
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Joined: 17 Oct 2007
Posts: 1076
Location: Victoria, BC

PostPosted: Mon Jun 09, 2008 11:12 pm    Post subject: Reply with quote

First, I would change the plug. If that doesn't bring it back then I would look at your airfilter and then your carb. You don't want to miss an easy fix like a leaf getting sucked into your airbox.
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roadcapDen
Beluga Legend


Joined: 19 Oct 2007
Posts: 404
Location: Burlington, ON CDA

PostPosted: Tue Jun 10, 2008 2:17 pm    Post subject: Reply with quote

Gas cap vent plugged? Or was that you before?
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roadcapDen

http://www.freewebs.com/roadcapden/cv80beluga.htm
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leeaustex
Beluga Legend


Joined: 11 Apr 2008
Posts: 149
Location: Austin, TX

PostPosted: Tue Jun 10, 2008 7:36 pm    Post subject: Reply with quote

nope that was me Embarassed
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luke racin
Beluga Legend


Joined: 31 Jan 2008
Posts: 238
Location: Warsaw, Poland

PostPosted: Tue Jun 10, 2008 8:43 pm    Post subject: Reply with quote

I've got so much work at the office I don't habe the time for the herc Sad
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Streetwriter
* CV80 Guru *


Joined: 17 Oct 2007
Posts: 54
Location: Ottawa, Ontario

PostPosted: Wed Jun 11, 2008 2:29 pm    Post subject: Reply with quote

I share your pain.
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luke racin
Beluga Legend


Joined: 31 Jan 2008
Posts: 238
Location: Warsaw, Poland

PostPosted: Fri Jun 13, 2008 6:48 am    Post subject: Reply with quote

I did the check you guys recomended and nothing helps... its carb cleaning this weekend... or can this be something different?
I took Herc for a little ride yesterday and I've noticed it gest s worse the longer I ride....
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DandyDan
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Joined: 17 Oct 2007
Posts: 1076
Location: Victoria, BC

PostPosted: Fri Jun 13, 2008 10:45 am    Post subject: Reply with quote

I dunno...I often find people clean their carb because they didn't find out what's really the problem. Sure it could be your carb but there are other things it could be too, so don't get your expectations too high.

One idea is bad gas. Perhaps some water/moisture got in your fuel somehow?
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Streetwriter
* CV80 Guru *


Joined: 17 Oct 2007
Posts: 54
Location: Ottawa, Ontario

PostPosted: Fri Jun 13, 2008 2:54 pm    Post subject: Reply with quote

Here are a few other ideas:

* Be sure that the carburetor is securely attached to the intake manifold and air filter box.
* If you're removing the carb, be sure to bleed the oil pump before attaching the hose.
* There could be a problem with ignition timing, which could be due to faulty wiring or a misaligned stator.
* The main jet or jet needle in the carb might be clogged or worn.
* You might have poor engine compression due to piston or cylinder wear.
* There could be problems with the primary sheave, clutch, and/or transmission belt.
* Mechanical resistance -- eg, the brakes might be binding?
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DandyDan
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Joined: 17 Oct 2007
Posts: 1076
Location: Victoria, BC

PostPosted: Sat Jun 14, 2008 12:42 am    Post subject: Reply with quote

Great thoughts Jeffrey! That's a great list to work through. Even though is not that likely of a candidate, I like to do a compression test as one of the first things since it's easy to do. If your scoot has good compression then you know it's either a spark related or air/fuel mix related problem and you can start narrowing those down. I'm not sure how you check your ignition timing easily but it is good to verify that your have a good spark and that it's properly timed so that you know it's an air/fuel mix issue.
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luke racin
Beluga Legend


Joined: 31 Jan 2008
Posts: 238
Location: Warsaw, Poland

PostPosted: Sun Jun 15, 2008 6:10 am    Post subject: Reply with quote

ok... since I'm a beginer in basic mechanics... I've confused the air filters.... It seems that the carb one didn't had the filter fabric.... I gues its the carb that got way to dirty and needs cleaning (pic)....



I'll contact yamaha on monday and chck if they can get me this missing part....

A dirty air cleaner box without the air filter Sad



I did looked into the v-belt cooling air cleaner box and it had the filte and was clean as a whistle

how do you perform a compresion test?
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DandyDan
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Joined: 17 Oct 2007
Posts: 1076
Location: Victoria, BC

PostPosted: Sun Jun 15, 2008 12:51 pm    Post subject: Reply with quote

Looks like you're making good progress. I ordered an airbox filter from my local Yamaha dealer last fall for about $4 so you should be able to get one too.

About the compression test, a compression tester tool is basically a pressure gauge that screws into your spark plug hole. So you remove the spark plug, screw in the correct size of compression tester fitting and then connect the gauge. With that hooked up, you use the kickstater maybe 5-6 times quickly and see how high the pressure gets. 90psi is really the minimum for a CV80 and 120 PSI is running like new.

Here's a pic of a compression tester. They cost $20-$60 normally.
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luke racin
Beluga Legend


Joined: 31 Jan 2008
Posts: 238
Location: Warsaw, Poland

PostPosted: Sun Jun 15, 2008 6:31 pm    Post subject: Reply with quote

thanks man.... I'll try to buy that tommorow along with some other things... Smile

btw.. I took a look at some polish scooter forums about carb cleaning and they recommend to soak it for a couple of hours in carb cleaner (overnight is what they say) should I reassamble it first and soak all the elements apart or just soak it as it is?
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roadcapDen
Beluga Legend


Joined: 19 Oct 2007
Posts: 404
Location: Burlington, ON CDA

PostPosted: Mon Jun 16, 2008 12:30 pm    Post subject: Reply with quote

You can just soak it as is, remove all the jets and make sure they are clean so that you can see light thru them and the carb cleaner will spray right thru, safety glasses are a good idea, that stuff stings.
Check float and bowl and the little needle as well.
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roadcapDen

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