NMax engine overhaul

[Badrabbit]

My NMax is now 5 yrs old with 65000kms, the engine needs some love as it's become a little bit noisier, it's not as fast as it was, has Yamaha got an overhaul package for this bike, hoping someone has had this done and can give some info.

[papa al]

Is it burning oil? Smoking?

 

" Yamaha got an overhaul package for this bike?"

No, don't think so.

I guess they could put the parts in a box or bag,

or some kind of package tho.

 

Many shops do ring-piston-bore jobs.

Edited August 19, 2020 by papa al

[VocalNeal]

It is not as fast as it was because? 

- The belt is worn?

- The variator pulleys are worn?

- The catastrophic converter is plugged?

- (Some scooters) the valve clearance needs to be adjusted.

 

If you are going to spend any real money you might as well go 177cc

 

PS. Out of curiosity I bought a piston and cylinder for a Yamaha Filano for about 1500 baht, if i remember correctly.

 

Edited August 19, 2020 by VocalNeal

[JeffersLos]

Start by getting it a full service.

 

oil

oil filter

fuel filter

spark plug

coolant

brake fluid

brake pads

 

They will then also give advice on if anything else is required, a new piston and cylinder, etc.

 

Presuming that you take it to a decent place. 

[Badrabbit]

28 minutes ago, VocalNeal said:

It is not as fast as it was because? 

- The belt is worn?

- The variator pulleys are worn?

- The catastrophic converter is plugged?

- (Some scooters) the valve clearance needs to be adjusted.

 

If you are going to spend any real money you might as well go 177cc

 

PS. Out of curiosity I bought a piston and cylinder for a Yamaha Filano for about 1500 baht, if i remember correctly.

 

Nothing serious is wrong I just feel it could be better, no smoke etc, maybe because I've had it so long it just needs something.

[papa al]

Air filter?

Have you put on weight?

[Badrabbit]

2 minutes ago, papa al said:

Air filter?

Have you put on weight?

Air filter replaced recently, lost weight(little bit) it's fine just had it a long time.

[VocalNeal]

1 hour ago, Badrabbit said:

maybe because I've had it so long it just needs something.

Or you got used to it. ????

[Agusts]

I bought a Suzuki scooter 125 a few years back, it had exactly 65000km, it was very well looked after by a friend I knew..., but had problem idling, Suzuki guys tried everything but eventually said need to open the engine. Changed piston, piston rings, piston rod, gasket etc, all inclusive for total 1600 baht...! nothing really, was like new after that...

 

But if you like the bike and it serves you well maybe consider boring out the cylinder a bit and get more power for some change - need to go 3rd party shop.

 

Otherwise, as others mentioned check and overhaul CVT first before just overhauling the engine (if engine runs okay as it is) ...

 

[tlandtday]

On 8/19/2020 at 3:24 PM, papa al said:

Is it burning oil? Smoking?

 

" Yamaha got an overhaul package for this bike?"

No, don't think so.

I guess they could put the parts in a box or bag,

or some kind of package tho.

 

Many shops do ring-piston-bore jobs.

You are such a bore:)

[papa al]

On 8/19/2020 at 4:47 PM, Badrabbit said:

Air filter replaced recently, lost weight(little bit) it's fine just had it a long time.

[Not sure if those Yamaha bores can be machined], but if,]

can recommend top-notch

repair/overhaul shop in Pattycake.  // auto-spell, 5 5 //  

3rd. Road.

Other shops bring their cylinders here.  

Fast. Low prices. Honest.

Likely have parts in stock.

Less likely to screw up than others.

Can watch all work,

including machine work,

if you ask real nice.

Boss, Shi, decent English.

 

Times are tough for Thais.

Always tip accordingly.

 

Edited August 23, 2020 by papa al

[alx123]

If it's me I'll try to change all drive parts first before doing some unnecessary engine overhaul.

Variator set, belt and clutch set, gear oil, air filter , spark plug, engine oil....

 

My PCX is at 60,000 kms and still runs like new. I'm starting to get bored with it too but can't seem to bring myself to sell it as used prices are way too low. It's become my project bike where I put accessories and try different drive settings, etc. 

 

Your'e probably just bored with it, or it needs some new drive parts. 

[Kwasaki]

On 8/19/2020 at 3:49 PM, VocalNeal said:

It is not as fast as it was because? 

- The belt is worn?

- The variator pulleys are worn?

- The catastrophic converter is plugged?

- (Some scooters) the valve clearance needs to be adjusted.

 

If you are going to spend any real money you might as well go 177cc

 

PS. Out of curiosity I bought a piston and cylinder for a Yamaha Filano for about 1500 baht, if i remember correctly.

 

I wish there was a scoot forum it's a scoot with rubber belts etc and Yamaha would care not. ????????

[cali4995]

On 8/23/2020 at 11:59 AM, papa al said:

 

 

" not sure if those yamaha bores can be machined"

 

a good observation. for roughly the last ten years they've been advertising a diasil cyl coating. there is no longer a cast iron sleeve in an aluminum/alloy cyl

requires special honing if at all possible. different type of honing stones/abrasive

Edited January 10, 2021 by cali4995

[papa al]

On 1/10/2021 at 8:38 AM, cali4995 said:

 

" not sure if those yamaha bores can be machined"

 

a good observation. for roughly the last ten years they've been advertising a diasil cyl coating. there is no longer a cast iron sleeve in an aluminum/alloy cyl

requires special honing if at all possible. different type of honing stones/abrasive

Turns out DiASil  is not a coating:

DiASil is abbreviated form of Die Cast Aluminum Silicon. 

20% silicon is amalgamated into cast.

Will check w/ my rebuild guy to see if they can be bored.

Guessing...yes.

[cali4995]

good research . my mind is stuck on something porsche did in 70s nikasil coating. you are correct though. it is special alum with 20% silicon. brush research.com one maker of flex ball hones elaborates on special honing procedures. and apparently, if there's ample metal overbores possible. happy days. i thought simple ring jobs had been rendered obsolete

[quake]

would not a compression test be the first thing to do,

 before stripping the engine down ?

[cali4995]

it might be a place to start. but as other fellas accurately mentioned, there are several other possible reasons for power loss. if it's visibly smoking , with the metallurgy these newer bikes utilize, if would have had to been nearly run out of oil. old, ineffective valve guide seals can do this also( leaking oil into cyl) even if you

had access to machining equip regular tool steel cant be used to cut anything. all of big 4 use some type of proprietary tech with their piston/ bore configurations. why these clubs/ groups are so beneficial. it often takes combined knowledge to sort stuff out

Edited January 17, 2021 by cali4995

[cali4995]

blah , blah , timed-out . i guess why they most commonly sell pistons & cylinders as " kits"

 

sure, stick a compression gauge in there. couldnt hurt to know. one small variable quantified.

[VocalNeal]

If a new cyclinder and piston are only about 2000 baht why bother with rebore? 

 

But yes you could buy a compression tester and see if it really needs doing. 

Edited January 17, 2021 by VocalNeal

[papa al]

1 hour ago, VocalNeal said:

If a new cyclinder and piston are only about 2000 baht why bother with rebore? 

 

It isn't.

[Agusts]

1 hour ago, VocalNeal said:

If a new cyclinder and piston are only about 2000 baht why bother with rebore? 

 

But yes you could buy a compression tester and see if it really needs doing. 

 

I think the rebore comments is to increase cc and power, for upgrading the engine...

 

From what I read about Forza larger cylinder /piston kit being 25k baht, the larger aftermarket kits are far more expensive than stock...!

 

[cali4995]

this has been informative. i have to admit , poking around on lazad ive seen big bore kits for earlier mio's( 115cc air cool) for less than 2k. and millions of these littering the countryside.

 

but the nmax and pcx different beasts. id be concerned more with

reliability, longevity , quality of anything id changed on those. ive got two mio 125's paid 10k for one and 8k other

 

ive looked longingly at some r15's but a few years old they're facing same issues. 60-80k on clock. unknown maintenance required. expect repairs

Edited January 18, 2021 by cali4995

[VocalNeal]

On 1/17/2021 at 1:11 PM, Agusts said:

 

I think the rebore comments is to increase cc and power, for upgrading the engine...

 

From what I read about Forza larger cylinder /piston kit being 25k baht, the larger aftermarket kits are far more expensive than stock...!

 

 

I believe one can only go to 177cc, so 22cc extra. Hardly worth it. But if one could find a big valve head in Thailand? But the OP just wants an overhaul?

Stock parts for Yamaha, like Honda, are inexpensive. 

 

Edited January 18, 2021 by VocalNeal