Kawi2strokes.com Forum

It's definitely odd that someone did pull the chain oiler off at some point, but I guess that is one more part to add to the list of things to find and get.

So......I've been tearing into this bike pretty aggressively the last few days. Pulled the engine last night, and removed the cylinders today. One cylinder has a some light rust in it, which I'm hoping a REALLY light hone job will take care of. The other two look great. Pistons look alright. Rings were tight, but loosened up easily with some penetrating oil.

Couple of questions at this stage.

1. Looking at the piston pins, they appear to be pressed in. Do I just press them out to remove the pistons and any recommendations on doing this?

2. Any recommendations on brands for new Pistons and rings? And for that matter, gasket sets?

3. Out of curiosity, are there any known production numbers on these bikes? I guess I'm kinda curious if some years and colors are rarer than others.

Thanks again guys for your help so far!
Eric

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'75 Kawasaki H2C
'75 Yamaha RD350
'75 Honda CB400F
'86 BMW R80
'94 Honda XR650 'street tracker'
'04 Honda RC51
2013 HD Heritage Softail
2013 Triumph Speed Triple R

When you take the wrist pin clips out, the pins should push out without too much trouble. I've had to scrape the deposits off the piston a little to get mine out a few times.

My preference for new pistons is Wössner. Lots of guys here are using them now.

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If it surges, that's normal, upshift.

The piston pins have little circlips that must be removed. The pins are not pressed in.

I like Wossner pistons personally. Wiseco are another brand folks use.

The 75s are gaining popularity. In my opinion the desired years for the 750s from most desired first are 72, 75, 73 then 74. Again, just my opinion.

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Crankshaft Testimonials viewtopic.php?f=25&t=7593

"Let's keep your crankshaft great!"

You beat me to the post Jim.

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Crankshaft Testimonials viewtopic.php?f=25&t=7593

"Let's keep your crankshaft great!"

I like Wiseco pistons. Wossners are very good too, either way I'd go with a forged piston with a coating on the skirt to help reduce wear on break-in.

You'll need a gasket set and a seal kit. I bought mine here...

http://www.midatlanticcycle.com/store/i ... cts_id=230


When you get to carbs, don't buy the Sudco rebuild kits. The brass parts are not the same as genuine Mikuni and can cause tuning issues. I chased my tail on my H1 with these.

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H2B..... H1E..... Z1B ..... RD350...... X6 Hustler..... TS250.... CB750 ..... CB550...... and a Bomber!!

To keep the bike as Stock as possible, maybe you should stick to the original pistons you already have? If you are Lucky, they may be Stock bore that still is within spec?

You did great by the way, Nice score!!

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72 H2, 72 H1B, 74 H2, 74 H2 Cafê Racer, 71 F8 Bison

I'm thinking that the bore size is stock as it looks like the engine was never opened up. I'll have to measure to confirm. Still think I'm going to go with new pistons w/ stock bore. Mine aren't terrible, but they are not new by any means. And it's one of those things that I'd rather do it now while I have it apart. Plus, I can't see this hurting the overall value of the bike to any buyer/collector (NO...this doesn't mean I'm selling it) since this is a hidden upgrade, and I'm not throwing away the factory pistons; they could be re-installed if need be.

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'75 Kawasaki H2C
'75 Yamaha RD350
'75 Honda CB400F
'86 BMW R80
'94 Honda XR650 'street tracker'
'04 Honda RC51
2013 HD Heritage Softail
2013 Triumph Speed Triple R

Stig.........could score their Man ..........I love my Mongrel Purple Special.......Yours is soo nice for a good restore to perfect stock.........and worth a fortune

THX Phil

It would be a little unusual to put new pistons in worn bores. I'd make very careful measurements of the cylinders before assuming it's a good idea. It takes only a very few thousandths to make noisy pistons, and it would be a shame to spend the money on pistons, only to have them rattle.

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If it surges, that's normal, upshift.

Nice bike and welcome.