CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE - NOW COMPLETE

[UK Pete]

Are you doing it Julie 

Ha, not on your Nellie Paul. I am staying right away from all the machine work, that's Trigs department. I can just imagine the reaction from him if I got it wrong or messed up or broke a boring bar or whatever it's called. No, let those that know what they are doing......do it !!!

I'm getting quite excited now as this is the last of the machine work, then I can just re assemble the top end. I have already re built all the individual components for the top end so just a case of fitting the pistons/ rings and finish building up from there.

Does trigg do rebores

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Yes Pete, he does

Can you get him to pm me a price for 750 I have pistons and rings

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[Nurse Julie]

Are you doing it Julie 

Ha, not on your Nellie Paul. I am staying right away from all the machine work, that's Trigs department. I can just imagine the reaction from him if I got it wrong or messed up or broke a boring bar or whatever it's called. No, let those that know what they are doing......do it !!!

I'm getting quite excited now as this is the last of the machine work, then I can just re assemble the top end. I have already re built all the individual components for the top end so just a case of fitting the pistons/ rings and finish building up from there.

Does trigg do rebores

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Yes Pete, he does

Can you get him to pm me a price for 750 I have pistons and rings

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Yes Pete, I will ask him to PM you.

[Johnwebley]

Keep up the excellent thread. As the bores/pistons/rings are the only major replacement parts.
What does Trig advise for oil and running in etc

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[Nurse Julie]

Keep up the excellent thread. As the bores/pistons/rings are the only major replacement parts.
What does Trig advise for oil and running in etc

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If I had my way I would take the advice of the Drag Boys and take it down the 1/4 mile absolutely screaming it's arse off  ................................. or I could pootle around at 20 mph for the next 10 years and end up with the pistons in the same state they were in when I started  .
But Trigs running in advice on this engine is 10w40 Mineral oil, ride it mid range revs, get it very hot with lots of cool air blowing around the barrels and change the oil at 500 miles.

[paul G]

Good luck getting the rings in Julie if he makes it as tight a tollerance as he did mine.
Good job the 400/4 has a very generous lead in 

[Nurse Julie]

Yes Paul, the tolerance on mine will be the same as Trig did on yours.....tight. I know your engine is running as sweet as a nut since Trig did the work for you so I have no doubt mine will be the same, spot on.
Maybe my small hands and fingers will be just right for getting the rings in, I'm hoping so anyway 

[paul G]

Yes Paul, the tolerance on mine will be the same as Trig did on yours.....tight. I know your engine is running as sweet as a nut since Trig did the work for you so I have no doubt mine will be the same, spot on.
Maybe my small hands and fingers will be just right for getting the rings in, I'm hoping so anyway 

Sure is can't wait for the summer this bloody weather is a right pain in the arse

[Nurse Julie]

Yes Paul, the tolerance on mine will be the same as Trig did on yours.....tight. I know your engine is running as sweet as a nut since Trig did the work for you so I have no doubt mine will be the same, spot on.
Maybe my small hands and fingers will be just right for getting the rings in, I'm hoping so anyway 

Sure is can't wait for the summer this bloody weather is a right pain in the arse

Agree with that Paul and I will have 2 engines to run in as the CB550 Mongrel will go on the road as well, so I need wall to wall sunshine from 1st April - 31st September 

[paul G]

You had better export them to Cyprus then
We are looking at Northern Cyprus again this year

[Nurse Julie]

I'm thinking I may fly them out to India with me in March, guaranteed sun and warmth there 

[paul G]

you on holiday AGAIN 

[Nurse Julie]

you on holiday AGAIN 

Yes Paul, anooooooooother holiday  And before we go to India, I'm off to Slovenia for a few days with my Nursey Girlfriends. Back in UK for a couple of days then off to India, so out of the UK for most of March.

[Laverda Dave]

Those pistons look very shiny and blingy Julie, shame to put them into the engine where they can't be seen!
I find the smaller the piston the easier they are to get into the cylinder especially with the luxury of a lead-in. The real problem is being able to insert two pistons at the same time!
I found the 250RSA piston to be a bit of a pig to insert into the bore and not helped by the stroke being so short. I couldn't get the ring compressor out once the rings were in the bore. I had to resort to the small blade screwdrivers pushing on each ring method to eventually get the piston into bore. Satisfying in the end though when you can turn the crank at the piston glides to the top of the bore.
Great thread and keep it going  .

[Nurse Julie]

Those pistons look very shiny and blingy Julie, shame to put them into the engine where they can't be seen!
I find the smaller the piston the easier they are to get into the cylinder especially with the luxury of a lead-in. The real problem is being able to insert two pistons at the same time!
I found the 250RSA piston to be a bit of a pig to insert into the bore and not helped by the stroke being so short. I couldn't get the ring compressor out once the rings were in the bore. I had to resort to the small blade screwdrivers pushing on each ring method to eventually get the piston into bore. Satisfying in the end though when you can turn the crank at the piston glides to the top of the bore.
Great thread and keep it going  .

Well at least the pistons look a million times better than the ones I took out !!!!. I think when I put the barrels on the pistons, I will just have to take my time and also make sure that Trig is around to help if I get stuck, or more to the point, loose my patience  I have seen him do it on so many Honda 4's but he usually makes it look so easy but I'm sure it's not.

[mike the bike]

Just think to yourself. .. slowly, slowly,  catchee monkey and they'll go in nice and easy.