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1977 400F2 first restore project
smoothoperator:
I need to give the sump a good clean before I can see how bad the crack is and whether to replace or weld. Meanwhile I have the barrels off so the internals are starting to reveal themselves. I've added some more images. I think the pistons are original, they are Honda, and a quick measurement of the bores with my £10 calipers gives a measurement of 50.8mm both top and bottom of all 4 bores. The rings on the pistons are moving freely although I've only had a quick look so far. The bores are in good condition on all 4. Now I need to get the garage organised before taking anything else apart as it's becoming difficult to find anywhere to place my feet!
https://photos.app.goo.gl/bHPeUnzFJK92wHHp7
Bryanj:
Been a bit of blowby but a very light hone and new rings should cure that, plus a good clean of course
smoothoperator:
Thanks for that Bryan it's very reassuring to have an expert opinion.
McCabe-Thiele (Ted):
I have to say the pistons look pretty good - what was the mileage out of interest ?
As Bryanj has said some blow by - looking at the cylinder head it's been a tad rich that might aggravate the blow by as excess fuel washes down the side or be a reflection of short journeys with choke use ?
Back in the 1960's when I was stripping down my Mini engine every 3 or four months I was always miffed to find the carbon deposits I had carefully removed each time spring back even with quality unleaded fuel.
I eventually started to blame the fuel so started using only one brand of petrol - it was "I.C.I." fuel it was a synthetic by-product from town gas coking plants & the chemical industry. It had a greater specific gravity than any other fuel due to a higher proportion of branched hydrocarbons it was said at the time.
When I moved to Bradford being a poor student I bought the cheapest 5 star that was available "NAFTA" I think it was Russian - after 3 months I had to do a decoke as the cylinder head was so badly gummed up!
Not thought about it before I wonder if the Hondas are okay with unleaded petrol ?
I hope mine is that good when I get it stripped down.
Bryanj:
Hondas were designed from the start for unleaded as thats what the yanks wanted and it was the biggest market
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