Surprised

[popeye]

Hi guys,

I got an 81 KDX 400 going for  the Boss the other day, started very easy after sitting for quite some time, put enough fuel in it to do a lap of the main MX track at home and both myself and the Boss were very surprised, bloody good thing all original except the FMF Muffler, went really good...

Any body no much about these things?

[GMC]

Don't know much about them but there seems to be a few of them around these days. They are on my want list but cash flow won't allow at the moment.
I did spy one at CD9 but didn't get a chance to get back to take a photo let alone see it be ridden.

[IT400C]

Don't know much about them but there seems to be a few of them around these days. They are on my want list but cash flow won't allow at the moment.
I did spy one at CD9 but didn't get a chance to get back to take a photo let alone see it be ridden.

They're a great thing.  Mine's the '79 (A1) with slightly different porting to the '80 model. 

I do have an A2 motor in my parts bike.  I'm thinking of swapping over the barrels at some stage - the A2 ('80) is supposed to have another 3 or 4 HP.

The A1 seems to have what's best described as a 2 Stage powerband.  Heaps of torque and loves to be short-shifted and heaps of upper-mid and top end power and loves to be revved..  But a bit of a dead spot in the mid range if you wind it out from nothing in one gear.

My Dad had an A1 back in 1979 and he remembers it being the same way.

I don't know if the A2 feels the same though.

[GMC]

Ah, so the 81 model would be the single shock then?

[IT400C]

Yup, 1981 was the first single shock bike..

[IT400C]

hmmm - 1981 wasn't a 400 either... it was a 420..   

[popeye]

The one here must 79-80 model then as it is twin shock, seems like a good thing all the same.

Done not much work by the look of it.