470 engine ... 380 kit?

Kayeffess · Mar 21, 2015

Picked up the flywheel puller today and got to work splitting my first berg engine. It all came apart fine following the instructions in the docs.
The engine has roller bearings. All seems fine and nothing really seems damaged. The piston and liner were in surprisingly good shape. I'm planning on installing the 92mm piston and liner I picked up. I'm debating removing the counterbalance.
Does anyone have any thoughts on this?
I think I'll be replacing the mains and likely do a rod. It doesn't have the "clonk" I read about in the docs but the side play is right on the line.

Kayeffess · Mar 21, 2015

Taffy · Mar 22, 2015

pin and bearing?

as for with or without the balancer I would say that unless you get the crank balanced to run without the balancer then pulling it alone isn't an option. it has just way too much low speed vibration.

Taffy

Kayeffess · Mar 22, 2015

I'm planning on putting in a complete kit pin and bearing. I'm really considering removing the balancer and balancing the crank. I like the idea of lightening it but at the same time I understand that the counterbalance counters the gyroscopic forces that try to prevent the bike from turning. I just want the most bang for my buck to keep it as light and flickable as this is nothing but a trail/race bike.

Kayeffess · Apr 5, 2015

Pulled the balancer off the 470 crank. I'm not sure if this is normal....this is the inside face of the balancer. It looks like something got caught in there and ground a groove in it. The crank looks fine. Any ideas? There was nothing in the bottom of the cases when I split them.

Kayeffess · May 31, 2015

It's been a while, other things have got in the way. The pro x 450 rod rod arrived from Amazon.ca , it was a very good deal. Tonight I popped out the mains and a transmission bearing that felt rough. My 20 ton shop press made easy work of this. The left side bearing came through smoothly using the gearbox bearing. I used a 30mm socket to press out the right side. New ball mains are on the way. It's just about time to order up the rest of the items I'll need to finish this engine.
The counterbalance is bothering me. It is only a single row bearing...do I need to worry about this?
The right side case doesn't have the hole drilled to feed the main bearing. Do I need to bother with this?

bushmechanic · May 31, 2015

its not a big job to drill a drip oil feed to the RHS main like the later cases

be careful where you put the hole though as there is less material in the older ones

there is a small rib in the centre i drilled near the center of that but quite close to the inner edge of the case with a 3mm drill then sent a 12mm drill into the top about 3mm and then used an air tool to create some kind of oil collection area to feed it.

the CB .. i just remove the clattering pieces of junk and balance the crank. FWIW though Thomas of engine hardware posted the single row balancer is fine .. he doesn't have all that many posts so it should be easy to find it.

Kayeffess · Jun 1, 2015

Im waiting for parts so I'll post some more info. The bike is to be a trail bike and possibly a race bike ....we will see if I can ride it fast enough.
It started life as an 01 FC550. I think this is pretty cool

Picked up a set of ktm adjustable 18-20 clamps they made a big difference on the 650

Pro x rod

Cases cleaned and waiting for the new mains ( it had rollers, going to ball )

The bike will have an EFM auto clutch out of the 650 and a left hand rear brake ...the brake master is off a 99 skidoo. Kind of cool, it has a light switch and a parking brake on it .

The 470 cases beside the 650. Broke a cam chain on the 650 last fall.

Kayeffess · Jan 12, 2016

The project has been on the back burner during the riding season as I was riding and racing a husky 144 and my 650. It doesn't seem that the 380 piston is going to work. It is too tall and hits the head. I guess, I could have the piston machined to fit but I think I'm going to look at another option.
The 400 piston is 92mm and should fit.
Will the big valve head work on the 400?

Taffy · Jan 12, 2016

Kayeffess said:
The project has been on the back burner during the riding season as I was riding and racing a husky 144 and my 650. It doesn't seem that the 380 piston is going to work. It is too tall and hits the head. I guess, I could have the piston machined to fit but I think I'm going to look at another option.
The 400 piston is 92mm and should fit.
Will the big valve head work on the 400?

I'm sorry about that KFS! I completely forgot about the deck height of the piston. perhaps it would be better as an OEM piston being left alone and resold. I'm sure it is needed as there are no more being made if I recall?

I have a piston in stock that is 92mm, and is 0.3mm taller than the std 400 piston for the perfect squish of 1.1mm max. it is flat on top, takes the big valves and the little end is 20mm which is what the 470 crank needs.

regards

Taffy

Kayeffess · Jan 12, 2016

Taffy said:
I'm sorry about that KFS! I completely forgot about the deck height of the piston. perhaps it would be better as an OEM piston being left alone and resold. I'm sure it is needed as there are no more being made if I recall?

I have a piston in stock that is 92mm, and is 0.3mm taller than the std 400 piston for the perfect squish of 1.1mm max. it is flat on top, takes the big valves and the little end is 20mm which is what the 470 crank needs.

regards

Taffy

No worries Taffy. I'm interested in the piston. Could you pm me info, pricing and shipping.

Taffy · Jan 13, 2016

if you fitted a 450 crank instead of the 470 crank then the piston would work? you'd have a 450 instead of a 470?

I'll PM you details of the piston now.

regards

Taffy

Kayeffess · Jan 13, 2016

I'm not sure how a 450 crank would work for me as I'm working with the sems ignition. I'm not sure I'm ready to tackle a kok. Conversion.

470 engine ... 380 kit?

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