When letting out the clutch, she bucks... [Archive] - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums

: When letting out the clutch, she bucks...


LibertyPilot
02-25-2009, 08:38 AM
Let me preface this with some info that may be pertinant. I got my VN750 last August in GREAT shape. Its the bike I learned to ride on and has been sitting for about 2 and half weeks until yesterday.

So I managed to squeeze in a quick ride yesterday and when I was letting out the clutch for the first time, she bucked. I let out the clutch to the normal place where it grabs and it didn't grab. I let it out a bit more and it suddenly grabbed because she lurched forward all at once. She's never done that before in fact, she didn't do it again for the rest of the ride. Letting out the clutch in first was normal after that every time. Do I need to do something with the clutch? Replace it maybe?

lance328
02-25-2009, 08:47 AM
Let me preface this with some info that may be pertinant. I got my VN750 last August in GREAT shape. Its the bike I learned to ride on and has been sitting for about 2 and half weeks until yesterday.

So I managed to squeeze in a quick ride yesterday and when I was letting out the clutch for the first time, she bucked. I let out the clutch to the normal place where it grabs and it didn't grab. I let it out a bit more and it suddenly grabbed because she lurched forward all at once. She's never done that before in fact, she didn't do it again for the rest of the ride. Letting out the clutch in first was normal after that every time. Do I need to do something with the clutch? Replace it maybe?

Your scoot was probably not fully up to operating temperature, it happens sometimes after setting awhile especialy if the oil has not fully warmed. The friction plates and clutch discs stick together, nothing to worry about. :smiley_th

750Doug
02-25-2009, 09:56 AM
Yeah, likely due to sitting for a time and the temp. I wouldn't sweat it.

fergy
02-25-2009, 10:28 AM
When you read about the "coffee grinder" noise, now you will know what they're talking about! The key is to start easing out the clutch until you feel the friction zone and then slowly roll on the throttle as you complete the clutch let out to fully engaged. If you give too much throttle and then find the friction zone, you will get the lurch until your bike is at operating temp.

cglennon
02-25-2009, 10:31 AM
Sounds like the infamous ‘coffee grinder’ issue, a known issue with this bike (search the forum for ‘coffee grinder’). It may sound and feel like a major problem, but isn’t and happens to mine all the time. If it goes away after a few miles, then don’t worry about it.

LibertyPilot
02-25-2009, 11:26 AM
I think its safe to say this has been yet another eureka moment courtesy of the stellar VN750.com folks. So THAT'S what everyone means by "coffee grinder" sound! What's ironic is I have a coffee grinder and the sound is incredibly similar.

So if I understand correctly, its clutch out first then roll on throttle to compensate the rpm decline. Not roll on throttle then let the clutch out to catch the rpms. Yup, its definitely safe to say: Eureka. That would be what my neighbor was making fun of me for, the coffee grinder sound. He kinda taught me how to get moving in first gear when I got the bike. He's been riding for decades.

Ok, I think I can take the remainder of the research from here. Thank you for your responses and for your patience with the noobers.

I love this site...

fergy
02-25-2009, 02:35 PM
I think its safe to say this has been yet another eureka moment courtesy of the stellar VN750.com folks. So THAT'S what everyone means by "coffee grinder" sound! What's ironic is I have a coffee grinder and the sound is incredibly similar.

So if I understand correctly, its clutch out first then roll on throttle to compensate the rpm decline. Not roll on throttle then let the clutch out to catch the rpms. Yup, its definitely safe to say: Eureka. That would be what my neighbor was making fun of me for, the coffee grinder sound. He kinda taught me how to get moving in first gear when I got the bike. He's been riding for decades.

Ok, I think I can take the remainder of the research from here. Thank you for your responses and for your patience with the noobers.

I love this site...

You got it! Ease the clutch out til you feel the rpms start to drop and ease on the throttle and you're good to go. This site does rock doesn't it!

BigT
02-25-2009, 02:53 PM
One thing I've noticed with my bike is when the oil starts getting a little older, I get the coffee grinder noise more often. While letting the bike warm up a little, I'll squeeze the clutch lever a few times to make sure it's lubricated...when that stops working it's time for an oil change for Rowdy.

I don't know if others have had the same experience with their bikes, but that's what I've noticed with mine.

Joem
02-25-2009, 04:41 PM
See, even a built-in oil-change warning system. So many more factory accessories than other bikes!

Hey bro...is it springtime down there yet?

BigT
02-25-2009, 05:28 PM
It's getting close Joe. It's been in the mid to upper 70's most of the week...and I had to mow my yard last weekend. Next thing you know it'll be too hot for anybody but us die hards to ride.

The wife bought me a new seat cover for christmas, the flame embossed one on ebay. I'll put up some pics when I get it on, assuming I don't screw it up I think it'll look good.

LibertyPilot
03-03-2009, 10:07 AM
Thanks again for all the help. Now if only we could get rid of this damn snow and get the temps up into the 50's I'd be able to try it out!!!

dutter
03-03-2009, 03:34 PM
mine does that when cold, even more with thicker oil (new 20w40). i just expect it so i let the bike warm up then i pump the clutch lever around 10 times before i take off. this helps me some. i was thinking about drilling the clutch basket as shown around here in a drawing.