ashaq54

Dear xBHPians,

i desperately need your help and expertise.

having this horrible poblem with my 2200KM+ old R15. at the beginning after firing up the engine, the idle speed reaches around 1400RPM and after 2-3 minutes it starts fluctuating. even the engine sound starts to struggle a bit. then the idle speed settles at around 1100RPM, besides, the exhaust pressure through the muffler tip also falls quite a bit compared to what it used to be just a week before. this is just the beginning...
if i start riding the bike straightaway, all of a sudden the engine just stalls when i pull in the clutch and downshift, normally from 2nd to first. this is really shocking for me. however, i have kept the engine running for 10-12 minutes and revved a bit before start riding and then it seems quite ok, although the idle speed still varies. moreover, if i keep on shifting up and speeding-on, the engine runs fine. it's only when i slow down and downshift, the engine just turns itself off.
previously the idle speed stayed within 1400-1500 RPM (as suggested by the manual) in all scenarios. last night i had adjusted/raised the idle speed to 1500RPM by adjusting the screw on the right side...but, this morning the same thing happened again....i previously had no problems at all with my bike. but, having this trouble for last two mornings.

please let me know what might be the problem and what can be done to solve it. i am really depressed about this and feeling quite disoriented..hope you guyz can help me out.

looking forward to receive your replies.
thanks in advance.

ken cool

Strange!

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Sarvajit

First step: Get the idle speed checked with an engine rpm meter (a small piece like a pendrive) at the SVC. They will connect 2 wires also. This will help to know exactly what rpm the engine is idling at.

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satyenpoojary

Do you have adequate engine oil?
What fuel do you use?
Is there smoke coming from the silencer, if so what colour?
If not, then rev the bike hard and keep your hand near the exhaust to trap the smoke... is the residue oily, watery?

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tibby

The idling on your bike is way too low IMO, & is the reason why the engine is dying. My bike's idling had also come down to 1100 RPM once, & I had some issues with the engine seeming to die then.

You mentioned that you had adjusted the idling on your bike. Did you do it on a warm engine, or cold. It SHOULD be done on a warm engine.
Also, once you set the idling right (on a warm engine), you need to rev the bike a bit (in neutral), & re-adjust idling if the RPM falls below what you had just set.
The idling RPM as per the manual is 1300-1500 RPM. I would recommend an idling of 1300 or 1400. Higher the idling RPM, higher is the fuel consumption (during idling).

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ashaq54

here goes my replies:

Do you have adequate engine oil? Yes, I do.
What fuel do you use? Octane available in Bangladeshi market.
Is there smoke coming from the silencer, if so what colour? nop, couldn't notice any smoke.
If not, then rev the bike hard and keep your hand near the exhaust to trap the smoke... is the residue oily, watery? will check that.
Did you do it on a warm engine, or cold? i did the adjustment on a warm engine. for the time being it ran ok. the next morning the problem prevailed. for the first few minutes after firing-up, the idle speed went up to 1500, then started fluctuating around 1100-1200RPM. and the RPM needle is not steady at all, goes up and down.

however, if i keep the engine running for 8-10 minutes and rev up the engine a bit, then this stalling stops. i think, it's the first few minutes when the engine is not fully warmed-up, therefore, idling speed is fluctuating and engine is stalling.

zayn

It may be Auto choke.Get it check your R15 Electrical wiring and Battery fuse too.In Authorized Workshop..

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jd666

i would suggest the following -

- get tappets adjusted/valve clearance
- check air filter
- check fuel injector for clogging ( best done by using a suitable injector cleaner with petrol )

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ashaq54

went to a workshop. the mechanic says, it's happening due to some low quality fuel. the spark plug had brownish shade on it as well which i believe due to the poor quality fuel. as per the mechanic's view, this problem will be solved once i replenish the fuel tank with better octane.

what do you guyz think..?? can that be a cause...??

Ganeshan

True that the whole thing sounds really strange! Poor fuel, in that it is contaminated by dirt or water, can cause the engine to idle erratically or stall, so I'd go by what your mechanic's advice. Although I can't see how low octane fuel would cause such symptoms. Could it be that your spark plug is failing, or has the wrong heat rating? Would love to hear what the problem was when you've cracked it... Best of luck!

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