can it be fixed

hillclimbjim · Post by **hillclimbjim** » October 17th, 2010, 11:13 am

had a rod break and it took a 1/2 x3/8 chunk out of the case where the crank fits in, should i try welding it or get a new one

qkenuf4u · Post by **qkenuf4u** » October 17th, 2010, 1:31 pm

hillclimbjim wrote:had a rod break and it took a 1/2 x3/8 chunk out of the case where the crank fits in, should i try welding it or get a new one

personally if i was still back home in PA. i wouldnt think twice about having the local welder guy weld it up.. he fixes all the coal truck beds and is a dirtbike rider himself .. has a huge shop and all the right tools.. he learned from his dad (R.I.P.) and knows his stuff..... really dont see why ya cant weld it up as long as the welder knows WTF hes doing...

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » October 17th, 2010, 2:25 pm

if you dont have the ability to weld it or machine it back it can be a pain.

let me know what you need for it if you sell it

maddog1927 · Post by **maddog1927** » October 17th, 2010, 2:26 pm

Post some pic's there are guys on here that will point you the right direction.

hillclimbjim · Post by **hillclimbjim** » October 17th, 2010, 3:28 pm

dont know how to post pics , dont look like its in to bad of a spot its up high

britincali · Post by **britincali** » October 17th, 2010, 3:32 pm

How the hell did you snap the rod?

Post by **MojoScojo** » October 17th, 2010, 3:35 pm

hillclimbjim wrote:dont know how to post pics , dont look like its in to bad of a spot its up high

http://www.bannedcr500riders.com/board/ ... hp?t=10024

hillclimbjim · Post by **hillclimbjim** » October 17th, 2010, 3:37 pm

not even 1 hour on motor, dont know what happened,made the whole hillclimb season with it 17 races, 4 times a race

britincali · Post by **britincali** » October 17th, 2010, 3:38 pm

You runnin nitrous?

hillclimbjim · Post by **hillclimbjim** » October 17th, 2010, 4:19 pm

no c12, 32.1, mabey a bad rod, it was oem

100hp honda · Post by **100hp honda** » October 17th, 2010, 4:20 pm

13,000 rpm free rev when nitrous kicked in

hillclimbjim · Post by **hillclimbjim** » October 17th, 2010, 4:44 pm

4 bikes set up the same way with the same parts,all honda,

dubious01 · Post by **dubious01** » October 17th, 2010, 5:35 pm

I just bought a bottom end with broken rod... the big end broke. and the whole rod is missing...

it only scored the cases a little, guess this guy got lucky.

I think guys run them till the big end bearings fail, when they pile up it spreads the big end into an oval an then the big journal cracks open....

just a theory I have....

100hp honda · Post by **100hp honda** » October 17th, 2010, 5:37 pm

probly defective i would guess. 3lb sand been through brits and rod held fine

dubious01 · Post by **dubious01** » October 17th, 2010, 5:40 pm

This one broke on the intake / compression stroke, the bottom cases aren't bad but the head and cylinder apparently were wortheless...

I never have carnage issues like that all the years I have ridden

seanmx57 · Post by **seanmx57** » October 17th, 2010, 6:28 pm

I cracked a honda rod on the big end and I didn't have a ton of time on it either. Adam found the crack during inspection.

gregrobo · Post by **gregrobo** » October 18th, 2010, 3:37 am

we have repaired a cr 250 that holed the cases thru a dropped piston skirt needs to be a welder with some skills

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » October 18th, 2010, 7:24 am

seanmx57 wrote:I cracked a honda rod on the big end and I didn't have a ton of time on it either. Adam found the crack during inspection.

its wierd, thats the only rod i've ever seen cracked too. stil have pictures somewhere.

Welding the cases is no big deal, its having the ability to properly machine them back to working.

I bought a 1987 case on ebay for .01$ + 5$ freight

i blasted it, welded it, got the boring bar in it and sized it, then surfaced .002" off it to make sure it was strait. Its running excellent, was the first engine in my AF, sold it to bro for his conversion after i put my ported engine in.

hillclimbjim · Post by **hillclimbjim** » October 18th, 2010, 8:11 am

its almost in the same spot and size

south central hoon · October 18th, 2010, 2:59 pm

i had a set of cases where a broken rod had gone right through the bottom and made a huge whole on both halves. welded it up and worked great. looked funny from the outside the weld was a perfect heart shape.

it can be done.

dannygraves · Post by **dannygraves** » October 18th, 2010, 7:59 pm

weld it

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can it be fixed

can it be fixed

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