I need a good telling off for this and some advice on how to fix. Rebuilding top end

[CookMySock]

Is the GSX400 a built up crankshaft? I thought they were a four cylinder, a 4 cylinder pressed up crank would be rare.

Heh my bad. I had just done a vtwin, so I was thinking from that angle.

Steve

[FROSTY:Me]

Honest injun mate--You are better off getting a good engine than doing the crank. Its just not economical--HONEST
If it was me in your shoes I'd buy a GS400 or even a GS450 engine and bolt it in.If you want the adventuure then with the GOOD engine haul the lid off and give it a valve grind and new rings. --personally I wouldn't bother

[Hamish Carlson]

But I've had this girl for 3 years, redone the electrics twice and been up and down nz on her twice. As economical as it would be to find a newer engine and part the broken one, I feel I owe myself to keep her running like she always has. I've put my soul into this bike, and I'm not ready to take it back. If I don't spend my pay on junk, I end up with a fair chunk to put into my passtime. Thank you for the concern though.

[Gareth123]

Anyone know anyone in Timaru/chch that would do the crank splitting deal and replace the big end bearings?

Try Kevin at KG Engineering/Motorcycles. My Dad uses him for his older bikes. He does a good job.

[_STAIN_]

Ummmm, if the motor lost one cylinder, made a "new" loud noise and the oil light came on I wouldn't immediately think the tappets needed adjusting, more like the crank bearings or something of that ilk. Grinding the valves and adjusting the tappets probably isn't going to fix that.

You may want to investigate further ie; strip & inspect the entire motor, before you spend time and money on the head. Once you know the extent of the problem then decide what is your most economical choice of action.

+1, tappit noise is piston hitting the head