Lightweight Big End Failure

Eddison5 · Post by **Eddison5** » Mon Aug 06, 2012 9:29 pm

The big end has failed on my newly acquired G2 250 CSR. Only done a few hundred miles since it was rebuilt. I am stripping the engine down now but might need to take it to a some one who can be trusted to do a good job. I live in Wilts - any recommendations?

Thanks for you time in reading this,

Ted

borrowashboy · Post by **borrowashboy** » Tue Aug 07, 2012 3:43 pm

welcome to the seized big end club, ted. i've had 2 go on me, even after meticulous rebuilds. i'm a great believer in 2 and a half pints being totally inadequate, and looking at an external oil tank conversion for mine. i know it can be done.
cheers, bb.
ps, sorry not to be more helpful

rex.webb · Post by **rex.webb** » Tue Aug 07, 2012 6:36 pm

WHY ??????????????????????////
MORE OIL is no use if it is not getting to the BIG END !!
Ther must be something "WRONG" ? somewhere to cause this to happen ?
RIDE with CARE and LIVE LONG to ENJOY your Bike .s and Scooter,s.
Insured with Peter James.

Eddison5 · Post by **Eddison5** » Wed Aug 08, 2012 10:30 am

Thanks for coming back to me. Just waiting for a timing pinion extractor then I will have the crank out. Will check for other damage and investigate the various oil ways for blockages - the pump was certainly pumping. Think I have found a local engineer who can do the crank, otherwise I see that the Club web site has advertisers. At least I am getting to see how this thing is put together - I keep telling myself!

borrowashboy · Post by **borrowashboy** » Wed Aug 08, 2012 7:17 pm

hi ed, don't forget to take the pump out BEFORE the crankcases are split. not trying to teach you to suck eggs, but, just in case
rex - what would break down first in a hot engine? 2 and a half pints inside the engine or 6 pints in an external oiltank?
cheers, bb.

Eddison5 · Post by **Eddison5** » Wed Aug 08, 2012 11:18 pm

Yes, the pump is out, I read the book!. Thanks for the reminder.

rex.webb · Post by **rex.webb** » Wed Aug 08, 2012 11:41 pm

rex - what would break down first in a hot engine? 2 and a half pints inside the engine or 6 pints in an external oiltank?
cheers, bb.
Well LOT and LOTS of ENGINES have been running on the normal amount for YEARS !!.
WHY should extraoil now be needed ????????
RIDE with CARE and LIVE LONG to ENJOY your Bikes and Scooters .Insured with Peter James.

borrowashboy · Post by **borrowashboy** » Thu Aug 09, 2012 9:13 am

and lots and lots of model 14 and it's derivatives have seized up big ends. every single [scuse the pun] person i know that's had one of these bikes has done a big end. i've got 3 spare cranks in the shed - all of them seized, and for the cost of an old oiltank off some nondescript bike and a couple of feet of copper piping, that's the way i'm going to go. unless of course alpha now repair and rebuild big ends for nowt? more chance of james type forks winning a brilliant design competition.
cheers, bb.

Eddison5 · Post by **Eddison5** » Thu Aug 09, 2012 10:32 am

Who, or what, is "Alpha" BB?

dave16mct · Post by **dave16mct** » Thu Aug 09, 2012 11:51 am

Alpha bearings in Dudley.