Bike lurches forward and dies when going into first gear.

Started by Iarn, April 13, 2016, 02:25:13 PM

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Iarn

Title. It only does it when the bike is cold. I can't start it from first when it does this. After I manage to get it down the street and warmed up a reasonable amount, there are no more issues. I can turn the engine over in first gear from that point forward.

Where can I look to fix this? I adjusted my clutch cables but that didn't seem to help.

fetor56

My bike did this to,and from new.
Since it's a wet clutch the plates stick together overnight.Not an uncommon problem and some ppl zip tie the clutch lever in overnight to keep the plates separated.
I'v found that when selecting first gear for first time overnight have the idle briefly to 1500 RPM....that way the momentum of the bike possibly lurching forward counteracts any stall factor.

TheGreenWeenie

Quote from: fetor56 on April 13, 2016, 03:02:15 PM
My bike did this to,and from new.
Since it's a wet clutch the plates stick together overnight.Not an uncommon problem and some ppl zip tie the clutch lever in overnight to keep the plates separated.
I'v found that when selecting first gear for first time overnight have the idle briefly to 1500 RPM....that way the momentum of the bike possibly lurching forward counteracts any stall factor.

My vstar does this occasionally as well. especially after having swapped to a thicker oil. My guess is that the motor oil will warm up fine at idle but since nothing inside the drive train is moving the oil just just sits there all cold n stuff. When it's actually cold cold out, ill swap to a lighter weight oil and I don't stall out as much on that first startup.

1996 GS 500E
2016 XSR900

Iarn

Quote from: TheGreenWeenie on April 13, 2016, 05:45:21 PM
Quote from: fetor56 on April 13, 2016, 03:02:15 PM
My bike did this to,and from new.
Since it's a wet clutch the plates stick together overnight.Not an uncommon problem and some ppl zip tie the clutch lever in overnight to keep the plates separated.
I'v found that when selecting first gear for first time overnight have the idle briefly to 1500 RPM....that way the momentum of the bike possibly lurching forward counteracts any stall factor.

My vstar does this occasionally as well. especially after having swapped to a thicker oil. My guess is that the motor oil will warm up fine at idle but since nothing inside the drive train is moving the oil just just sits there all cold n stuff. When it's actually cold cold out, ill swap to a lighter weight oil and I don't stall out as much on that first startup.

That might seem logical, but I've been using the same oil for a long time now. I just changed my clutch pads and this never happened before on the old ones.

TheGreenWeenie

Does it do it when starting to accelerate? Or is it with the clutch pulled in and just shifting the peg into first?

1996 GS 500E
2016 XSR900

TheGreenWeenie

#5
double post -_-

1996 GS 500E
2016 XSR900

fetor56

Iarn.....i think it's the luck of the draw.
I'm half-expecting when it's necessary to install a new clutch it won't require 1500 RPM when left overnight.

user11235813

#7
@Iarn I wondered about this when I first got the bike, I though it was indicative of a clutch problem but I have come to realise that it's normal, will even lurch occasionally when warm if started in gear particularly dangerous if a passenger is mounting the bike. These day I start the bike in neutral as per the recommendation in the manual, 'problem' solved.

EDIT: upon re reading this may in fact be different to what you are talking about.

Iarn

Quote from: user11235813 on April 13, 2016, 08:08:00 PM
@Iarn I wondered about this when I first got the bike, I though it was indicative of a clutch problem but I have come to realise that it's normal, will even lurch occasionally when warm if started in gear particularly dangerous if a passenger is mounting the bike. These day I start the bike in neutral as per the recommendation in the manual, 'problem' solved.

EDIT: upon re reading this may in fact be different to what you are talking about.

The problem isn't turning the bike over in gear. The problem is after I've turned the engine over in Neutral. Once I shift to first the bike lurches and dies from the safety mechanism.

That's fine, the safety is working. The issue is that when it lurches, my clutch is pulled in. So that doesn't seem that normal :D

Quote from: TheGreenWeenie on April 13, 2016, 06:44:56 PM
Does it do it when starting to accelerate? Or is it with the clutch pulled in and just shifting the peg into first?

Nope, after I get under way I never experience the problem again. It's with the clutch pulled in and just shifting the peg into first, yes.

I was ignoring it for a while but today I tried to leave my girlfriend's house the problem was the worst it's been yet. I choked the bike for 2 or so minutes, kicked the kick stand up, pulled in the clutch and shifted it into first. When I did my bike lurched forward and died. I tried to use the starter to turn my engine, but the bike never responded to that. Just dead. After that it was really difficult to shift back into N gear. I had to use my hand and jerk the shift lever up. I choked it for about 3 more minutes after that and she let me be on my way.

Watcher

Can't really offer much help internally, but have you done a 3-point clutch adjustment?

If the cable is adjusted properly but the throwout pin on the clutch isn't pushing in far enough it might not be disengaging the clutch properly.
You could be kicking it into gear on the edge of the "friction zone" and thus stalling the engine.
"The point of a journey is not to arrive..."

-Neil Peart

fetor56

Sorry,wrong section.  :confused:

bmf

I suspect there are two problems, clutch friction, can be fixed by the three point adjustment, and an intermittent problem with the side stand cut out switch. This would cause the bike to die when first gear is selected. It would also explain why the starter would not work then.
Might be worth your while to check the functionality of that switch which is at the base of the side stand.
You think Pyrrhic victory is bad you should try Pyrrhic defeat!

TheGreenWeenie

Quote from: bmf on April 14, 2016, 03:34:57 AM
I suspect there are two problems, clutch friction, can be fixed by the three point adjustment, and an intermittent problem with the side stand cut out switch. This would cause the bike to die when first gear is selected. It would also explain why the starter would not work then.
Might be worth your while to check the functionality of that switch which is at the base of the side stand.

These were my initial thoughts as well. And i would consider looking at the clutch cut off switch right underneath the lever. the 96 i have have a mangled up switch and was causing all kinds of havoc when starting. I personally removed it and just closed the circuit, Now i can start with out pulling in the clutch but still do anyway.

1996 GS 500E
2016 XSR900

Watcher

Quote from: TheGreenWeenie on April 14, 2016, 04:34:14 AM
These were my initial thoughts as well. And i would consider looking at the clutch cut off switch right underneath the lever. the 96 i have have a mangled up switch and was causing all kinds of havoc when starting. I personally removed it and just closed the circuit, Now i can start with out pulling in the clutch but still do anyway.

Clutching to start is a good practice anyway.  If you are an experienced rider there's no reason why the clutch cutoff should even be necessary.
"The point of a journey is not to arrive..."

-Neil Peart

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