Something wrong with my GN

[Thani-B]

Just when Im looking to sell it to upgrade as well :( any suggestions would be appreciated.

Ok, ginny went fine on the way to cold kiwi, and went fine on the way home. Couple of days later (before it was used again) thought it would be a good idea to do an oil change, as it hadnt been done for a while. So bought some oil and did that on Wed night. Didnt get a filter cos it didnt occur to me at the time.

On Thur rode in to work, everything seemed fine. In the afternoon, hopped on the motorway to head to the SATNR meeting point, and bike feels like it is a massive vibrator when around 70-90km/h. I think above that it was just vibrating too much for me to actually realise it still was. Gear changes feel a bit jerky, and the engine braking isnt as effective as it usually is.

While waiting for others to arrive, txted a few people about it, and the general thing comes back as maybe it doesnt have enough oil. I bought a litre bottle, it takes 1.3 litres. And I spilled maybe a lil bit while pouring it in, but it should have had at least 900mls in it. So I didnt think it would be that. Bike performed like crap during the ride, and was a bit hesitant to ride it to work the next day. Slept in so had to though. Still not running as it used to.

On Sat went to Colemans to test ride the SV, and while I was there bought some more oil and a filter. Got home and did another oil change with the new filter (not sure if that was a good idea or not). So bike has new oil and new filter, and Im not even sure if it was that that caused the problem in the first place, but it still feels like Im riding a vibrator. Not the nice kind.

Any suggestions?

[boman]

My bikes, in the past , have always taken more oil than specified. I would check your oil level ASAP. Use the sight glass on the side of the motor. Sit on your bike on a level surface, like you are going for a ride, then get somone else to have a look at the level in the glass. It should be a least half at the best at the full mark. If it is not showing then top it up.


Ps Too much oil is as bad as not enough oil. Too much and the crank shaft airates the oil making it's viscosity (slipperiness) nowhere near good enough.

[Ixion]

Replace the sparking plug.

[Squiggles]

Run the bike for a couple of minutes then hold it upright (not the main stand or the sidestand) and look through the sight glass on the RHS, after a minute it should sit at midway to full on the glass. You may however find you're missing a mounting bolt/something else is loose or simply the imagination is the cause... cant tell without seeing it

[Thani-B]

simply the imagination is the cause...

Lol! Im sure I would have remembered if I was riding a vibrator around most of the time.

[mossy1200]

dont gns have a dip stick on the filler cap?Do they have sight glass at all?

[Thani-B]

dont gns have a dip stick on the filler cap?Do they have sight glass at all?

Has a sight glass.


Run the bike for a couple of minutes then hold it upright (not the main stand or the sidestand) and look through the sight glass on the RHS, after a minute it should sit at midway to full on the glass.

After doing this, it looks about halfway full. :confused:

[bogan]

could it be unrelated to the engine? wheel weights falling off etc, does the vibration occur at a certain speed, over a certain speed, all the time, at certain revs etc...

[Thani-B]

could it be unrelated to the engine? wheel weights falling off etc, does the vibration occur at a certain speed, over a certain speed, all the time, at certain revs etc...

Ive noticed that its from about 70km/h onwards, did look at the revs but cant remember what they were at. Shall do that tomorrow I suppose.

[bogan]

Ive noticed that its from about 70km onwards, did look at the revs but cant remember what they were at. Shall do that tomorrow I suppose.

if its from 70k onwards my guess would be wheel weights have fallen off, or wheel bearings, maybe even incorrect chain tension. I rode off with a disc lock on my bike once, (it has the inboard disc brakes so i had to chuck it on the spokes) turns out it didnt stop the wheel spinning :doh: got to bout 30k and the bike was shaking like a bull in a blender (which is to say, lots), mind you the disc lock did weigh 1.3kg.

[Morcs]

Lol! Im sure I would have remembered if I was riding a vibrator around most of the time.

Im sure if it were most of the time, you wouldnt think anything of it :bleh:

and that moaning sound you hear yourself making inside your helmet is just completely normal :clap:

[Vern]

I personally would first replace both the spark plugs as they are not expensive as it is likely to be just a coincident that it showed up after the oil change. You have nothing to lose by changing the plugs. Vern

[Snails pace]

As Bogan says. I would look at the wheels, tyres, chain etc.

[howdamnhard]

Lol! Im sure I would have remembered if I was riding a vibrator around most of the time.

At least you will be enjoying riding it ,he,he:buggerd:. Try determine if it is speed or rev related. If speed, it's probably running gear related(wheels,chain,sprockets,etc). If rev related its engine( spark plug , eng mounts,etc). Check over all the bolts.
You should have kept it a secret that you are planning to replace it.Mine decided to break when I was looking to upgrade, sneaky things them bikes are.:lol:

[Thani-B]

OK well after my ride today, I think Ive come to the conclusion that it becomes a vibrator at around 5000 revs. When Im going 100km/h its usually at 7. Redlines at 8.5 in case anyone wondering.

Not told it I was replacing it.. yes it probably knew I was going test riding on the weekend and tried to sabotauge it. lol

[bogan]

OK well after my ride today, I think Ive come to the conclusion that it becomes a vibrator at around 5000 revs. When Im going 100km/h its usually at 7. Redlines at 8.5 in case anyone wondering.

Not told it I was replacing it.. yes it probably knew I was going test riding on the weekend and tried to sabotauge it. lol

so if you rev it up to 5k in nuetral it does it as well, or just when its in gear?

[Thani-B]

so if you rev it up to 5k in nuetral it does it as well, or just when its in gear?

Neutral as well.

[Laava]

If the vibration stops when you pull the clutch in at that speed, [5000rpm] then it is definately the engine.

[bogan]

Neutral as well.

itll be an engine problem then. Someone has suggested replacing the spark plug, thats probly a good place to start. The fact that it does it in nuetral as well suggests it not a fueling issue. Could be ignition timing as well.

[Cheshire Cat]

Get rid of the heap!!! Get a real bike!! lol:girlfight:

[mister.koz]

I had lots of trouble with my ol' gn. but the good thing is that they are really easy to work on, if its happening in neutral then its definately the engine.

This may sound weird but unplug the rectifier and take it for a blat.

My rectifier shat itself and started delivering about 18volts around the 6000rpm mark and the increased voltage confused the cdi (ignitor which is a voltage-dependant timing circuit) i took the rectifier off and the problem went away, then got a 2nd hand rectifier because the battery did need to be charged!

Other things to try are:
Spark plugs
Spark leads - you might have knocked them loose
Tappet gaps (use the manual+feeler guages)

Its really unlikely but it could be the shaft that drives the gearbox, then again if that was damaged or warped then you would notice it at low revs...

Simple thing is warm it up, turn it off then unplug the rectifier - it will run for a while on battery and you only need a few minutes to wind it up to 5000rpm