Question for the weekend mechanics about my motorbike

Yamaha Nouvo 2010 (maybe Nouvo 3) is infamous for his loud engine especially when he gets older and older. The engine will be smooth when you ride at high speed (40km/h) but will be louder at low speed. You did meet some dealers and they have the same answers, so in my opinion you have to accept it. the loud comes from the old engine so you cannot do anything but buy a new handsome guy Nouvo 2015 

The biggest challenge us communicating with mechanics!

Have you tried contacting the Yamaha Factory office here in HCM? Or the HCM mechanic training school?

I only buy Kymco's and use Kymco owned service stations, However, whenever I feel something hasn't been fixed properly I go to the factory training school where there are master mechanics always looking for problems to help their students. Kymco actually gives visitors motorcycles a complete overhaul free of charge.

This evening a student of mine who loves/owns Yamaha machines is coming over tonight so I will ask him and see if has any ideas. I will respond tomorrow.

I know very good 'no name' mechanics in ChoLon, if they could be of help.

Check the idle pin might have to turn it up a bit. Does it stop early in the rides?

I'm a big Kymco fan too. My Kymco Bet and Win 250 was my main mode of transportation in Canada and only dealer that offered a 2 year warranty. Surprised Kymco is considered crap in Vietnam (they still think Taiwan is same as mainland China) seeing as Kymco and Sym are a splintered group from Honda in Taiwan going back almost 60 years.

khanh44 wrote:

I'm a big Kymco fan too. My Kymco Bet and Win 250 was my main mode of transportation in Canada and only dealer that offered a 2 year warranty. Surprised Kymco is considered crap in Vietnam (they still think Taiwan is same as mainland China) seeing as Kymco and Sym are a splintered group from Honda in Taiwan going back almost 60 years.

The Kymco warranty is unbelievable - 50,000/3 years. They even offer roadside service within city limits - even hauling a failed unit back their service facility.

Now they are assembled in VN their prices for a 125cc fuel injected, auto gearbox, motorscooter has dropped from VND28,000,000 to VND16,000,000.

My unit is heavily modified (polished ports, etc) but my wife's unit is bog standard. My employer has four units of varying ages. One is over 100,000 kilometres and still running well.

When I bought my first Kymco, based on secure carrying capacity and ease of attaching a trailer hitch, I paid their asking price. Two days later they called and said they had charged too much. They refunded the erroneous amount and added 7.5% discount as 'appreciation' for accepting their error without argument. Try that in North America!

I am happy people consider Kymco as a 'Chinese' product, it makes my equipment less attractive to thieves who drool over Honda and Yamaha machines.

MY YAMAHA OWNING STUDENT, who is also an automotive electronics technician, suggested the problem might be the TIMING BELT that synchronizes the ignition with the mechanical movement (but you know that).

However, of you have electronic ignition you don't have a timing belt!

If you need the address of motorcycle whizzes in ChoLon - let me know.

I've rented quite a few Nouvos over the years and recently had a similiar problem.  It would run fine, then it would run rough from a stop, or it would refuse to start for a while, then suddenly jump to life.

I took it to have the spark plug changed and the guy just refurbished the old one, which cured the problem...for a few days. 

I took it back and insisted on a new one, which he finally installed, after complaining loudly to anyone within earshot. 

One week later the problem reappeared, prompting me to have a look-see.  On the right hand side there was a hose that had a large burn in it.  I went back and showed him; he laughed and ignored it, then cleaned the plug and got it going once again.

Three days later the problems started again, so  I fixed the hose myself. 

Problem solved.

I love Nuovos but they are gas hogs and can be problematic. Good luck!

Just a quick update for closure on this -- I went to a mechanic who is a trusted friend of my local friend, and he said that the engine was losing compression and needed some overhaul work. What I've learned is that the "service centers" for Yamaha, Honda, etc. are usually not qualified to do diagnostics. If you want the oil changed or genuine OEM parts, the service center can do that for you, but they will also find many "problems" that they will say need new parts (especially if you are foreign).

Thanks all for your ideas and suggestions, they were much appreciated.