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**shubhanker** · 07-23-2010, 09:42 AM

do you downshift too quickly?? coz the rev limiter kicks if the engine rpms go way too far in the red zone and the ecu cuts off the supply to the engine to protect it..
otherwise there might be air filter blockage or water in the tank or inappropriate spark plug gap..next when you get your bike serviced, plz don't watch tv in the waiting room but be with the svc guy for the whole time..

**shubhanker** · 07-23-2010, 09:50 AM

try this today..when you brake, don't downshift. Simply pull the clutch and brake..let the bike stay in the 6th gear during the whole braking period..bring it to a complete halt and then see if the same problem still happens..if it does, any of the three causes mentioned secondly above. If it doesn't, then probably you should really give up the aggressive downshifting

**Ganeshan** · 07-23-2010, 01:33 PM

Originally posted by ashaq54 View Post

yeah, the problem started occuring after a servicing and wash at my mechanic's place

The bike is supposed to run better not worse after being serviced!! If poor petrol isn't the problem as your mechanic said, then I'd take it back there so that he can check the electronic side of things.

Originally posted by ashaq54 View Post

at any speed, when the bike is running, if i pull-in the clutch fully, the engine is supposed to keep on running with the RPM staying just at the idle mark, isn't it...??

It shouldn't stall

**ashaq54** · 07-23-2010, 02:59 PM

well...i do downshift quite vigorously...but, i have been doing so since day one..why the problem is occuring now after 2300KMs...?? besides, when i down shift even from 2nd to 1st gear, this has happened a few times..no jerks, no noise...simply the engine cuts off power and, this morning starting the engine again seemed to be struggling as well...

air filter is clean and clear...will check the spark plug and will clean-up the tank..but, one thing is, acceleration and topspeed is not affected at all..it still goes upto 125 and still jumps up when i accelerate hard in first few gears..

i am so frustrated...so, in short, i need to get the following things checked by my mechanic:

Clutch wiring, spark plug, tank clean-up, re-checking the air filter...
anything am i missing....please do let me know..

**GOU** · 07-23-2010, 04:49 PM

Originally posted by ashaq54 View Post

well...i do downshift quite vigorously...but, i have been doing so since day one..why the problem is occuring now after 2300KMs...?? besides, when i down shift even from 2nd to 1st gear, this has happened a few times..no jerks, no noise...simply the engine cuts off power and, this morning starting the engine again seemed to be struggling as well...

air filter is clean and clear...will check the spark plug and will clean-up the tank..but, one thing is, acceleration and topspeed is not affected at all..it still goes upto 125 and still jumps up when i accelerate hard in first few gears..

i am so frustrated...so, in short, i need to get the following things checked by my mechanic:

Clutch wiring, spark plug, tank clean-up, re-checking the air filter...
anything am i missing....please do let me know..

If indeed the problem is because of the faulty fuel as mentioned by your mechanic, I have one suggestion. Just get your fuel tank totally empty - empty fuel in some bottles. Fill it up with fresh trusted fuel and see if the problem persists. If the problem is still there, then its not because of bad fuel. Then you need to check on other things you mentioned.

**shubhanker** · 07-24-2010, 01:12 PM

did u try the method i suggested regarding braking while pulling the clutch and leaving the bike in the 6th gear..also your bike is very new, u shouldn't treat it very aggressively..this time is very crucial for the engine..

**ashaq54** · 07-24-2010, 08:47 PM

well...i will try the method tomorrow morning..i mean bringing the bike to a complete halt then down-shifting back to first gear...
this morning i left the engine switched on for 10 minutes and revved a bit...then took it out for a ride...within the first 100 yards when i downshifted from 2nd to first, the engine died off...for the next few minutes i did rev-up and brake a lot within the first 3 gears...the bike went on ok...no more engine stalling...
let's see what happens tomorrow...

**ashaq54** · 07-25-2010, 07:32 AM

Originally posted by shubhanker View Post

did u try the method i suggested regarding braking while pulling the clutch and leaving the bike in the 6th gear..also your bike is very new, u shouldn't treat it very aggressively..this time is very crucial for the engine..

yeah..tried it this morning several times and the engine did stall few times...i would say 2 out of 5 times attempted....i guess that's not a problem with my downshifting....i think i need to check the following things (as per suggestions from this forum):
Adjust Idling RPM, Auto Choke, Battery Fuse, Tappets adjustment/valve clearance, Check air filter, Tank clean-up, Check fuel injector for clogging, Faulty spark plug/wrong heat rating, Adjust clutch cable, Inappropriate spark plug gap...

anything else...??

**shubhanker** · 07-26-2010, 01:33 PM

changed the fuel and then seen if the prob resurfaces??

**ashaq54** · 07-26-2010, 03:49 PM

will do so on day after tomorrow...
got the following reasons for engine stalling through digging down the internet:
Incorrect idle speed, Clogged fuel filter, or bad gas, Damp or damaged distributor components, Bad, fouled, or incorrectly gapped spark plugs, Emissions system malfunction, Bad spark plug wires, Vacuum leak in the fuel injection system, intake manifold or vacuum hoses, Torque converter is not unlocking--
considering the pretty new bike of mine, i guess bad gas, spark plug adjustment, vacuum leak and the torque converter issue sound to be the culprit.
will check soon and will track back soon.

**shubhanker** · 07-26-2010, 08:56 PM

Since you bike is pretty new, air filter clogging and bad fuel are the topmost culprits in my opinion..check them first before you move on to other bigger but rarer reasons..

**ashaq54** · 07-28-2010, 06:18 PM

since today is a national holiday here, i will take my bike to the workshop on saturday. took it out for a spin this morning and the problem is there as usual. i can narrow it down like this:

a. Idle RPM is wrong. currently it's in the range of 1500-1800.
b. Bike stalls while decelerating, pulling in the clutch..no matter if i downshift at the same time or not.
c. while slowing down, if i keep the throttle a bit open and pull-in the clutch, the engine keeps running.
d. in neutral the bike idles fine, at somewhat higher range (1700-1800)
e. this problem mainly occurs during the first 10-15 minutes of riding. after that it somehow disappears or occurs much less frequently.

anyone..any suggestions...??

**shubhanker** · 07-29-2010, 12:34 AM

IMO, that is a classic case of a choked air filter

**ashaq54** · 08-01-2010, 07:11 AM

Originally posted by ashaq54 View Post

since today is a national holiday here, i will take my bike to the workshop on saturday. took it out for a spin this morning and the problem is there as usual. i can narrow it down like this:

a. Idle RPM is wrong. currently it's in the range of 1500-1800.
b. Bike stalls while decelerating, pulling in the clutch..no matter if i downshift at the same time or not.
c. while slowing down, if i keep the throttle a bit open and pull-in the clutch, the engine keeps running.
d. in neutral the bike idles fine, at somewhat higher range (1700-1800)
e. this problem mainly occurs during the first 10-15 minutes of riding. after that it somehow disappears or occurs much less frequently.

anyone..any suggestions...??

got the bike checked by yamaha mechanic. he has tuned the idle RPM somewhat OK, and according to him, bad/poor fuel in my tank is the culprit. however, this morning had an amazing observation. the engine does not stall or die completely, rather, it goes to a sort of hibernation when i pull in the clutch during deceleration. i see the rev counter dropping to zero and if i release the clutch with a hint of throttle, the engine just wakes up. no problem what so ever. it did not use to happen brfore during the first 2200 KMs, so, surely there is still some problem left untreated.

can anyone please let me know what is happening....??

**shubhanker** · 08-01-2010, 12:01 PM

the engine is stalling and when you release the throttle, the engine starts due to the moving wheels..it's like starting a bike while pushing it in 1st gear and then releasing the clutch..i still feel it's a clogged air filter

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