Hey guys.
Serious problem with my friend's FzS.
It's 2012 model clocking around 72k ODO.
The concern is bike is giving white smoke while revving more than 4000 rpm. And some sound also there in engine. Asked to a local machanic , he said problem is in ring piston as they need to be changed. Bike is sealed one with company fitted rings, piston, clutch plates, timing chain, etc.

We also got the bike checked in authorised Yamaha service centre. They also diagnosed the same issue.

Now the confusen is local machenic said that engine need only rings, piston, clutch plate and timing chain to be replaced. Piston would be of 25 number with somw lathe job you know. (Half engine work)

But YSC guys said that engine need full kit to be changed (Full engine work). They didn't agree to do half engine work as i mentioned earlier.

Now i am confused with these 2 options. Which option should i opt for? Economic one or expensive one?

Clarification :- My friend uses his bike much
less now a days (just 300-400 kms per month) because he got another bike and car but he still wants to keep Fz trouble free but in economical way.

Bike is still performing well as it is highly maintained. Always runs on motul 5100 semi-synthetic engine oil. Fuel economy 40+ in local and 45+ on highway. But top end reduced drastically. It used to clock 125 km/h (i personally hit that) but now it screams to get even 100 km/h and engine sounds like it will blast in any second at that point. This Problem starts with crossing 60 km/h.
But haven't noticed any drop in engine oil level.
Help it guys.

Cheers
Mathews

Local mechanic asks for a .25 rebore and oversized piston rings. This method may be economical but the final result depends on quality of workmanship at lathe. CNC machining is preferred for this type of work. Whereas SVC is asking for new bore kit and piston this is tension free and you will get 6 months warranty from the SVC. I would suggest you to get all the genuine parts form SVC and get an experienced local mechanic and get the work done by him. So you can save some money on labour charges

Thanxx bro. Nice suggestion. Now further..

1. Is .25 size piston kit available at SVC or i need to buy it from outside. If so then which company makes good .25 piston?

2. Will this method restore top end speed to earlier one i.e. 120+ kmph?

3. What will be effect on pickup and mileage?

4. What other things i need to replace along with piston? List of all the items i need to change?


Pls help.

SVC have normal bore and piston set. They don't sell oversized kits. Are you going to do a rebore? Then only over sized rings needed. You need to ride the bike below 50 kmph for the first 1000 kms after the work is done and then gradually increase speed. Engine break-in is needed after bore change so be patient and ride gently. Only after this you can expect increase in pickup. And for the low top end get the clutch plates checked replace only if needed change timing chain if it makes noise and get the carburetor cleaned throughly with clean air filter then fine tune carb. During overhaul of engine check the valves do a valve lapping if needed and properly adjust tappets. This may solve the issues I think.

Recently i bought pair of pirelli sport demon tyres rear 130/70 front 110/70 for just 4500 INR . i tell u these tyres r not upto the mark and skids a lot , hence met with 2 little accidents nothing major. The shopkeeper is a geniune seller in the market and he said its a offer from pirelli thats why it's so cheap these days. The tyres are brand new but not doing the job ! What shoild i do..?

Hello friends
What is the cost of adjusting tappet (valve clearance) in any authorised service centre, Bangalore.

I had mine done at Whitefield Yamaha for 250/- or 300/- . Don't remember the exact price.

I had mine done at Whitefield Yamaha for 250/- or 300/- . Don't remember the exact price.

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