Crankcase repair/replacement

JamS · L Plate Warrior Joined: 27 Mar 2019 Karma :

Hi, I'm having a bit of a mare....

I went to change the neutral switch on my bike, had the haynes manual out, watched a couple of videos on YouTube (2 bolts, easy job I thought), but nope - the lower bolt hole has oil pouring out of it. The bolt came out with lots of bits of metal stuck in the threads, followed by a lot of oil, so i'm assuming this has been damaged previously. I've had the bike about 10 months and this is the first time i've removed this bolt. What I thought was going to be a 20 minute job has turned into a complete nightmare!

My father in law is coming up to have a look - he's had more bikes that I can count and has loads of experience in this kind of thing, but i'm getting the impression that the crankcase might need to be replaced or maybe taken apart and welded - will see what he says when he gets here.

My question is - for a CBF125 that's worth about £1300, what am I likely to get charged to get it fixed and is it even worth it? I'm absolutely gutted, just passed my bike test and was fixing this to sell the bike and get something bigger.

Thanks for any advice!

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

You just need to helicoil the hole and then the bolt will tighten just fine. If you care to give your location there might be someone local who can help.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy

MCN · Super Spammer Joined: 22 Jul 2015 Karma :

I saw a sump hole repair system whilst wandering aimlessly through t' Internet a couple of daze ago.
I'll check my history and revisit the page.
It wasn't the helicoil device. (Which are not exactly straight forward cures for this problem due to sealing. Experience in working with them helps. And you need to buy a kit for helicoil anyway.)
____________________
Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

Tankie · Crazy Courier Joined: 24 Feb 2017 Karma :

Another type of insert which is a bit stronger than a Helicoil ,is a Timesert, this can be effectively sealed into the case
____________________
Always learning, everyday is a school day

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

That's a matter of opinion, but it doesn't matter anyway since there isn't enough metal around those holes to fit a timesert.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy

bikenut · World Chat Champion Joined: 21 Nov 2011 Karma :

Post a picture......
____________________
nuts about bikes

MCN · Super Spammer Joined: 22 Jul 2015 Karma :

https://www.ebay.co.uk/i/401601814662?chn=ps

I haven't used this but it looks purfick to fix a sump plug.

If you have access to the bastirt.
____________________
Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

JamS · L Plate Warrior Joined: 27 Mar 2019 Karma :

Thanks for the replies guys! Still waiting for my father in law to have a look - he's coming on Wednesday, but i'll have a look into your suggestions Smile

I can post a pic of where the issue is but you can't actually see anything, there's just a bolt hole with oil coming out of it (well not anymore!).

In the pic you can see the bottom hole which is a bit oily - I tried to clean it out and shine a light in there but it's just dark.

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

Just needs a helicoil mate. 10 minutes work with a repair kit.

https://www.ebay.co.uk/itm/30pcs-Wire-Insert-Thread-Repair-Kit-Helicoil-M6-Metric-Recoil-Insert-Set-BI829/153017487843
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy

Ed Case · World Chat Champion Joined: 01 Mar 2009 Karma :

MCN · Super Spammer Joined: 22 Jul 2015 Karma :

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

You're right it looks like blade damage from levering the cover off. Be lucky if that doesn't leak now.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy

davebike · World Chat Champion Joined: 15 Nov 2013 Karma :

I bet a previous monkey as used too long a bolt and punched a blind hole though !
Common fault on C90 cub etc can sometimes be sorted but mostly not !
____________________
Dave
NC750Xdct + others at work !
davebike1@gmail.com

MCN · Super Spammer Joined: 22 Jul 2015 Karma :

Another cause is someone ramming a bolt into a blind hole thats full of oil, grease, water and the hydraulic force blows the arse out of the hole. Embarassed

____________________
Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

On closer inspection. Is there not already a helicoil in the top hole?
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.