Engine bolt broken Vader 125

Jrack · 05-21-2017, 06:25 PM

If you own a Vader 125 make sure you check your engine bolt. Took a ride today cut short because of rain. Went out and started it up for another ride and heard rattling. Looked and saw the engine bolt vibrated almost all the way out. Best bet would be to just change it out before this happens. I believe it's 4" or 4 1/2", I'm not really sure cause I couldn't get it back in all the way and it measures 4" as is. 10mm wrenches will do the trick for the bolt if your going to replace it. You'll also have to take the foot pegs off (12mm, 14mm and 17mm) sockets for the pegs. You'll also have to lower the chain in order to replace it. I haven't done it yet but I've taken everything apart already so I can put it back together when I get a new bolt. I'll probably get both a 4" and 4 1/2" bolt just to be safe. Hope this helps!

jsumd · 05-21-2017, 11:12 PM

seems like a pretty common issue. I think i'll go ahead and nip this one and replace it. Thanks for the heads up!

PhildoScaggins · 05-22-2017, 06:41 AM

Seems like the engine bolts and the swing arm bolt should be replaced right out of the box. Once extracted someone should get some measurements.

Jrack · 05-22-2017, 11:20 AM

Quote:

Originally Posted by PhildoScaggins

Seems like the engine bolts and the swing arm bolt should be replaced right out of the box. Once extracted someone should get some measurements.

I measured the engine bolt when I took it out, 4''. Bought a 5/16'' 4-1/2'' inch steel replacement today. It should do the trick. I bought a lock nut and 4 steel washers as well. Not sure about the swing arm bolt. I suppose when I replace the engine bolt I could try the swing arm but I don't have a garage or bike lift. I've also had a problem with my chain coming loose. I've tightened it 2 times already and I don't ride it that much. I'm not sure what to do about it.

Jrack · 05-22-2017, 02:11 PM

Went with a 4-1/2'' bolt and it worked out nicely. Vibration seems to be much better with the new bolt! I only used 3 washers cause I couldn't get it to work with all 4. Didn't get to the swing arm bolt, sorry..

lildew · 05-22-2017, 02:26 PM

why did you take the pegs off for this? i did the bolts on mine and there was no need to remove the pegs you could of cut the 5" bolt also to make fit a little better and still use the washers like you did.

Jrack · 05-22-2017, 02:30 PM

Quote:

Originally Posted by lildew

why did you take the pegs off for this? i did the bolts on mine and there was no need to remove the pegs you could of cut the 5" bolt also to make fit a little better and still use the washers like you did.

It was a pain to get to with the pegs on. I have limited tools and no lift or stand. I only removed them from the one side. Why would I buy a new bolt and cut it when I could buy one the right size? Sorry for being a noob.

prismways · 05-22-2017, 03:27 PM

Skin Mechanic also has a good write up on his engine bolt replacement. It should be the same for Vaders as I'm pretty sure they're all the same when it comes down to it. I will go ahead and order some replacement bolts too since this seems to be too common.

Not sure about the swing arm, but will look into it.

It is surprising that your chain is loosening up frequently. The main nut on your rear wheel should prevent that from happening right? Between that and the chain adjustment nuts, I don't know what else can contribute to that.

Quote:

Originally Posted by Jrack

I measured the engine bolt when I took it out, 4''. Bought a 5/16'' 4-1/2'' inch steel replacement today. It should do the trick. I bought a lock nut and 4 steel washers as well. Not sure about the swing arm bolt. I suppose when I replace the engine bolt I could try the swing arm but I don't have a garage or bike lift. I've also had a problem with my chain coming loose. I've tightened it 2 times already and I don't ride it that much. I'm not sure what to do about it.

Jrack · 05-22-2017, 03:46 PM

Quote:

Originally Posted by prismways

Skin Mechanic also has a good write up on his engine bolt replacement. It should be the same for Vaders as I'm pretty sure they're all the same when it comes down to it. I will go ahead and order some replacement bolts too since this seems to be too common.

Not sure about the swing arm, but will look into it.

It is surprising that your chain is loosening up frequently. The main nut on your rear wheel should prevent that from happening right? Between that and the chain adjustment nuts, I don't know what else can contribute to that.

I wonder if the vibration was causing the nuts to loosen up. Not sure..I know I need a new bolt for the front sprocket, it won't completely tighten. Going to fix that later today. Might be the cause of the chain loosening up.

Jrack · 05-27-2017, 11:51 AM

The bolt on the sprocket seems to have fixed the chain issue. It's still as tight as it was when I put the bolt in the sprocket. Also tried a 90 jet in the stock carb and it bogged down at top end of each gear. Went with a 94 and its running better. Could probably get away with a 97, but I don't feel like taking the carb off anymore..

Also, my back tire has a screw in it...so, yeah.

Jrack · 05-27-2017, 07:41 PM

So I did try 98, 96, and 92 jets out of boredom. Had to go back to the 94. Running better altogether with it. It's weird how an 87 and 94 work but a 90, 92, 96 and 98 don't.

Weldangrind · 05-27-2017, 02:20 PM

Always use Loctite on motorcycle fasteners; it helps a lot.

05-21-2017, 06:25 PM	#1
Jrack Join Date: Mar 2017 Location: Northern Wisconsin Posts: 64	Engine bolt broken Vader 125 If you own a Vader 125 make sure you check your engine bolt. Took a ride today cut short because of rain. Went out and started it up for another ride and heard rattling. Looked and saw the engine bolt vibrated almost all the way out. Best bet would be to just change it out before this happens. I believe it's 4" or 4 1/2", I'm not really sure cause I couldn't get it back in all the way and it measures 4" as is. 10mm wrenches will do the trick for the bolt if your going to replace it. You'll also have to take the foot pegs off (12mm, 14mm and 17mm) sockets for the pegs. You'll also have to lower the chain in order to replace it. I haven't done it yet but I've taken everything apart already so I can put it back together when I get a new bolt. I'll probably get both a 4" and 4 1/2" bolt just to be safe. Hope this helps!
	2

05-21-2017, 11:12 PM	#2
jsumd Join Date: Feb 2017 Posts: 411	seems like a pretty common issue. I think i'll go ahead and nip this one and replace it. Thanks for the heads up! __________________ 2002 Harley Davidson XL883R 2012 Yamaha FZ6 2022 Hawk 250 2002 Yamaha R6 sold Vader 125cc sold after owning for many years 1997 Jeep Wrangler sold due to frame rot
	1

05-27-2017, 11:51 AM	#10
Jrack Join Date: Mar 2017 Location: Northern Wisconsin Posts: 64	Chain issue fixed, 94 jet The bolt on the sprocket seems to have fixed the chain issue. It's still as tight as it was when I put the bolt in the sprocket. Also tried a 90 jet in the stock carb and it bogged down at top end of each gear. Went with a 94 and its running better. Could probably get away with a 97, but I don't feel like taking the carb off anymore.. Also, my back tire has a screw in it...so, yeah.
	1

05-27-2017, 07:41 PM	#11
Jrack Join Date: Mar 2017 Location: Northern Wisconsin Posts: 64	Bored messing with jets So I did try 98, 96, and 92 jets out of boredom. Had to go back to the 94. Running better altogether with it. It's weird how an 87 and 94 work but a 90, 92, 96 and 98 don't. Last edited by Jrack; 05-28-2017 at 12:09 PM.
	1

05-27-2017, 02:20 PM	#12
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Always use Loctite on motorcycle fasteners; it helps a lot. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	1

05-22-2017, 06:41 AM	#3
PhildoScaggins Join Date: Apr 2017 Location: Woods, Maine Posts: 247	Seems like the engine bolts and the swing arm bolt should be replaced right out of the box. Once extracted someone should get some measurements.
	1

05-22-2017, 02:11 PM	#5
Jrack Join Date: Mar 2017 Location: Northern Wisconsin Posts: 64	Went with a 4-1/2'' bolt and it worked out nicely. Vibration seems to be much better with the new bolt! I only used 3 washers cause I couldn't get it to work with all 4. Didn't get to the swing arm bolt, sorry..
	1

05-22-2017, 02:26 PM	#6
lildew Join Date: Apr 2017 Posts: 31	why did you take the pegs off for this? i did the bolts on mine and there was no need to remove the pegs you could of cut the 5" bolt also to make fit a little better and still use the washers like you did.
	0