[Discussion] VFR Woes

[vfrT]

Try Googling for answer Type in "motorcycle fuel injection backfire" and you'll find what u need to know. It may be more serious that a common cold.

[loufu]

Try Googling for answer Type in "motorcycle fuel injection backfire" and you'll find what u need to know. It may be more serious that a common cold.

 

thx for the advice, got tis from wiki

 

A fuel injected engine may backfire if an intake leak is present (causing the engine to run lean), or a fuel injection component such as an air-flow sensor is defective.

 

Common causes of backfires are:

 

-Poor or unregulated engine timing is often a cause of intake backfires, but can also be responsible for exhaust backfires

-Improper wiring in the ignition can also lead to timing issues and backfires

-Low fuel pressure, clogged fuel filters, and weak fuel pumps could cause a severe lean air-to-fuel ratio during fuel injection

-Missing or damaged catalytic converter can result in backfires out the tailpipe

 

time to tune the FI?

[Echelon]

The last time this happened to me too, after I changed the sparks it was ok.

 

But I asked the mechanic's advise though.

[Wormz]

Bike vibrates at certain speeds

 

Hi... anyone experienced vibrations (whole bike shuddering) on their vfrs from 140 to 160 km/h at top gear? No vibrations when speed is below or above that range:dozed:

Edited May 31, 2009 by sino74

[none]

'shuddering' as means like engine run out of steam?

throttling more to bring it faster will be ok?

 

I had this before, between 4-5k rpm will be shuddering.

Realised it's the MY petrol issue, after clearing 2 tanks of petrol, its all right again.

 

otherwise, it will be the normal bearing, steering cone, tyres issue.

[Wormz]

'shuddering' as means like engine run out of steam?

throttling more to bring it faster will be ok?

 

I had this before, between 4-5k rpm will be shuddering.

Realised it's the MY petrol issue, after clearing 2 tanks of petrol, its all right again.

 

otherwise, it will be the normal bearing, steering cone, tyres issue.

 

By "shuddering" I mean I can feel the entire bike shaking from foot pegs to handlebars to mirrors A bit like how we feel when our bikes go over those speed reducing strips. No loss of power though...

 

I noticed that the shaking only occurs between 140 and 160 km/h. Didn't take note of the rpm at that time though...

[loufu]

i only notice my bike shudders when in low gear low rpm... in lower gears nid to rev up abit.. high gear high speed, nvr notice b4 thou..

[Wormz]

i only notice my bike shudders when in low gear low rpm... in lower gears nid to rev up abit.. high gear high speed, nvr notice b4 thou..

 

Yup below 3000rpm at any gear the bike will shudder. That is normal I guess I will change to a higher gear only when my rpm goes above 4000.

[vfrT]

By "shuddering" I mean I can feel the entire bike shaking from foot pegs to handlebars to mirrors A bit like how we feel when our bikes go over those speed reducing strips. No loss of power though...

 

I noticed that the shaking only occurs between 140 and 160 km/h. Didn't take note of the rpm at that time though...

 

There are a few possible reasons.

1. Wheels not balanced.

2. As steering head tightenening torque is out of tolerance or bearings may be worn.

3. Wheel bearings may be worn.

4. Fork or swing arm not aligned.

 

The poor fuel quality of some Malaysias petrol staions can also have detrimental effect on the performance of the bike. I've experienced sever power loss and hesitation in my car and vfr once. This could also manifest itself in "shuddering". Tho from yr description, it appears not to be so. After I topped up with our local fuel, the problem went away immediately.

[Wormz]

There are a few possible reasons.

1. Wheels not balanced.

2. As steering head tightenening torque is out of tolerance or bearings may be worn.

3. Wheel bearings may be worn.

4. Fork or swing arm not aligned.

 

The poor fuel quality of some Malaysias petrol staions can also have detrimental effect on the performance of the bike. I've experienced sever power loss and hesitation in my car and vfr once. This could also manifest itself in "shuddering". Tho from yr description, it appears not to be so. After I topped up with our local fuel, the problem went away immediately.

 

Thanks... will send the bike for a check on the above items when I free

[sino74]

Gen 6.

 

initially my bike temp goes up to 113+ degres celcius.

after changing the radiator cap , the temp. will go up the most to 105degree

celcius.

is this normal ?

btw the average temp. is 80+ degree celcius on expressway.

 

hope any can shed some lights...

 

:cheers:

[loufu]

Gen 6.

 

initially my bike temp goes up to 113+ degres celcius.

after changing the radiator cap , the temp. will go up the most to 105degree

celcius.

is this normal ?

btw the average temp. is 80+ degree celcius on expressway.

 

hope any can shed some lights...

 

:cheers:

 

tats a good sign bro, u shdn't be worrying abt it...

 

anyway, i did read thru other forum b4 abt the radiator cap will improve the heat dissipation.. something abt the correct pressure for the radiator tank..

 

Edit : i manage to find that discussion >

Edited June 2, 2009 by loufu

[James996]

Gen 6.

 

initially my bike temp goes up to 113+ degres celcius.

after changing the radiator cap , the temp. will go up the most to 105degree

celcius.

is this normal ?

btw the average temp. is 80+ degree celcius on expressway.

 

hope any can shed some lights...

 

:cheers:

 

It's normal.

Mine had rch 110+ degrees before due to a leak in the coolant spare tank.

[antonis643]

Gen 6.

 

initially my bike temp goes up to 113+ degres celcius.

after changing the radiator cap , the temp. will go up the most to 105degree

celcius.

is this normal ?

btw the average temp. is 80+ degree celcius on expressway.

 

hope any can shed some lights...

 

:cheers:

 

I have exactly the same problem with temperature ,it went up to 117 celcius once cause it is really hot here during the summer (up to 45 celcius)!they changed the thermostat during the winter but now that it is summer temp went to 110 and i m taking the bike again to Honda!

hope is the radiator cap and it is simple as that!!anyone else faced the same prob?

[sino74]

Gen6

- at some point of time , the fan will start running when reach to certain temp.

my question is...

do you guys wait till the fan stop then you off the engine

or just off the engine although the fan is still running ?

will it cause any harm to the bike ?

hope any can share your views on this.

tx in advance.

[snowparang]

Gen6

- at some point of time , the fan will start running when reach to certain temp.

my question is...

do you guys wait till the fan stop then you off the engine

or just off the engine although the fan is still running ?

will it cause any harm to the bike ?

hope any can share your views on this.

tx in advance.

I just off it. It doesn't make sense to leave the fan running cos once your engine stops, temp will drop slowly.

[RaVon]

I'm now on my 3rd pair of bulbs for my headlight and it blew yesterday, AGAIN!

On avg, the low beams blew after only 2mths+ !!!

Currently using Osram Nightbreaker, every 2 mths change once, very siong ah...

 

Anyone figured out what might be the cause of the problem?

[rstopel]

Hi, I got a new pair of H7 power Xtreme for sale. 80% more light than normal bulbs. $48 for a set. Anyone keen? Philips staff price

 

Got 1 H4 set as well but can't fit on VFR.

[Wormz]

I'm now on my 3rd pair of bulbs for my headlight and it blew yesterday, AGAIN!

On avg, the low beams blew after only 2mths+ !!!

Currently using Osram Nightbreaker, every 2 mths change once, very siong ah...

 

Anyone figured out what might be the cause of the problem?

 

Not an expert in electrical circuits but your light bulbs blowing might be due to sudden surge in current. Is there any patterns you observed just before each pair of bulbs blew? E.g. rev throttle --> bulb blow

[RaVon]

Not an expert in electrical circuits but your light bulbs blowing might be due to sudden surge in current. Is there any patterns you observed just before each pair of bulbs blew? E.g. rev throttle --> bulb blow

 

Cant really remember any pattern.

However, the last bulb blew while I was stuck in a jam and I was trying my very best to squeeze ard the stagnant traffic. So a fair amt of rev-ing of throttle is involved. Not sure if its the cause.

Once one blows, the other will follow soon.

[Wormz]

Cant really remember any pattern.

However, the last bulb blew while I was stuck in a jam and I was trying my very best to squeeze ard the stagnant traffic. So a fair amt of rev-ing of throttle is involved. Not sure if its the cause.

Once one blows, the other will follow soon.

 

Maybe can use multimeter to test the voltage output at your headlight connection while the engine is running? The battery might be supplying too high a voltage or current to the bulbs due to a faulty rectifier. Again just a guess from me only

[MT23]

Hey all viffers, can i chk 4 those who install voltmeter on yr vfr ( Autogauge, GIpro etc brand), wats the reading (digital or analog)?

 

Becos i wil like to make a comparison w mine whether accurate bo?

 

Mine Is Autogauge, digital. engine off @ 12.2v, idle @ 14.7, normal cruising between 14.8-15.1v. I guess sometin wrong w it liaoz

[loufu]

i using Shadow digital voltmeter...

 

i compare it with a more accurate FlukeII multimeter used in office(calibrated yearly), got differences up to 0.5volts...

 

and also i notice the longer i use the meter the poorer the accuracy gets.. mayb its the mindset tat saying the meter is lousy.. haha

[SLowLee]

i have a DATEL voltmeter but never get to fix it ...yet.

 

i think going to your MECHANIC with a digital voltmeter for direct comparison as you rev through the rpm would be more accutate .

[frogman]

Hey all viffers, can i chk 4 those who install voltmeter on yr vfr ( Autogauge, GIpro etc brand), wats the reading (digital or analog)?

 

Becos i wil like to make a comparison w mine whether accurate bo?

 

Mine Is Autogauge, digital. engine off @ 12.2v, idle @ 14.7, normal cruising between 14.8-15.1v. I guess sometin wrong w it liaoz

 

I'm also using Shadow digital voltmeter..normal cruising it fluctuates betwn 14.1-14.2V..engine idling in neutral,lights on bright,and brakes light on - get ard 13.2 i think..i know e highest i've seen is 14.2 and lowest is 12.7