Engine codes again!

[nickso]

This has been done before of course and I have searched, just wanted a couple of questions answered.

My 250 is a bit of a basket case so When I saw another one reasonably near me I bought it too as a spares bike as it had no docs and had been butchered a bit by the PO.

My 250 engine is damaged so I primarily wanted the engine off the new one. Don't know why I didn't think to check until today but the engine and frame numbers are different on the new one. The frame number is 1U5 the same as my bike but the engine code is 2A2 which puts it as a USA import 400 according to various posts on here. Does that sound right?

Is there a stamp anywhere on the head or block that says the capacity? Can't see anything. Any other way of visually spotting a 400 engine?

If this was a 400 motor and it works it would be the biggest bonus ever

 

[xschris]

There should be a number at the front bottom of the cylinders 391cc

 

[nickso]

Hi Chris, yes I thought that I saw that mentioned on another thread but mine is unmarked.

 

[Yamaguy55]

Hi Chris, yes I thought that I saw that mentioned on another thread but mine is unmarked.

Stealth. If the engine fits in the frame, does it matter?

 

[nickso]

No not really but it will save me looking for a 400 motor later on.

 

[xschris]

Hi Chris, yes I thought that I saw that mentioned on another thread but mine is unmarked.

Take some pics of the bike so we might be able to tell.

 

[nickso]

Will do Chris, is not complete so may be of no use. Will take some tomorrow anyway.

 

[nickso]

some pics of the bike/engine. Dunno if it's any use though.

Also notice the exhausts are different sizes. Is there anyway to ID the carbs?

 

[xschris]

If the carbs are 32mm it's most likely a 250 if they are 34mm it's a 400. Unless someone put a 250 top end on a 400 bottom. The other thing is someone could have ground off the 400 on the cylinders so they could tell people its a 250 The only real way of knowing is to pull the head off a measure the bore.

 

[nickso]

OK cheers for the help Chris.

I will measure the carbs and take that as the final size. Not looking to split the engine unless it doesn't run or something. I don't think the engine size has been ground...looks like normal cast marks on it to me.

Was hoping for an ID on the carbs to get new bowl gaskets as mine are rock hard.....can't seem to find ones that look like mine.

 

[nickso]

Both sets of carbs are 32mm at the butterfly Think I'm going to have to take the head off now....need to know what it is.