Honda-SOHC

Wonder what everyone reckons on this carb post from 'Hondaman' on our sister USA site.

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My mate in York thinking of selling his 500K1 Sprint bike (he used to regularly sprint it at the IOM but he's got a Scott sprinter now, so he's not using it).

The donor  bike was a USA  import and it's done less than 4k miles I think. He put some kind of fancy ignition on it and I know the carbs are good 'cos I provided them (the originals had suffered from long term storage in the States.)

PM me if interested.


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This is at the Ramsey Sprint in 2017 (with a lot of the original parts still fitted) ... He's doesn't have the standard parts (he gave them to me tyears ago )


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My 1967 CB450K0 Black Bomber is the ultimate jigsaw puzzle in that it came basically in a load of storage boxes left in a Crawley back garden for God knows how long and everything was totally stripped down, including the engine.

The main post is about fasteners so skip the following waffle if you like, about the project in general. 

I have gathered parts over the past 7 years for this bike,  like NOS period DID rims, NOS Genuine Honda silencers, NOS seat, front guard etc. etc. so it will be a lovely example if I ever get it finished. I painted it myself last year and it came out pretty good  and I had all of the chrome done a couple of years back and the speedo/tacho rebuilt by Peter Horton on here. I did have a NOS speedo but sold it to fund the rest of the project.

Fast forward to this week and I am now putting the engine together. I had about 4 cranks for this bike (very unique crank with 'plummer'  type block main bearings .. totally different to the later 5-speed... more like a Honda race crank. I gave these to my mate Graham Curtis and he totally restored one and I gave him the remains. I was lucky in that I found newly rebored cylinder barrels and NOS pistons that had been matched to the rebore in a lock-up that the Crawley guy had rented  (he was in his 80's and passed away and his son from London was selling the stuff off). Cams and followers are always mega hard to find for these and the exhaust cam always seems to pickup on one cam lobe. I found a a lovely inlet cam and a set of four really nice rockets/followers in all of the parts but all of the exhaust cams had a least one pit. During lock-down I sold some race type valves for a CB350K to Cappellini , who do parts for 1960's Hondas in Italy and he gave me decent money for them. I started a dialogue with him and gave him a Bomber rear brake pedal.... To my amazement, totally out of the blue, he posted me a pristine exhaust cam and some of his camchain tensioner sprocket repair kits and a magnetic sump plug that they sell . What a kind gesture !

Anyway, I am all set to finally put the engine together but I have discovered that the the nuts for the crank main bearing studs are not listed in any parts book and neither are the nuts for the crankcase halves retaining studs. I have researched this and found that the nuts are not standard ISO M6 and M8 nuts. The washers are not listed either but I am being told that the crank studs didn't have washers and the M6 crankcase ones are thinner than normal Honda ones (possibly Form 'C' is a match). From what I can glean the M6 nuts are standard 10mm A/F but are deeper than 'standard' ones . .i.e. just under 6mm rather than around 5mm as pictured below. I reckon the crank retainer nuts are probably deep M8's with 14mm A/F hex. I have found that deep M6 nuts and deep M8 nuts are used on classic Lambretta scooters .. so I am investigating as a possible source. I have also seen Honda nuts from the 1960's (fasteners not people  ) having one side bevelled and the opposite side almost flat

Anyone on here restored a Bomber engine and have any recollection of this please?

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1966 Bomber did OK at H&H Auctions today, as made £7,000 plus Fees (I guess around 1K ) so buyer paid around £8k

The three 400/4's didn't do well at all IMHO.

https://www.handh.co.uk/auction/search/?au=539

Don't think it's a scam ... but there again it is on Facebook !

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Actually been to houses like this .. one in Bishop Auckland and one on Anglesey.

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My 1980 CB250 RSA gear change linkage 'rose' joints were completely fooked and I am restoring this bike on a budget (albeit one which already totals to probably considerably more than it's worth ..but hey ho. 

Anyway I bought the parts below ... the cheapo rose joints were far to big so I chopped them to the correct length and trimmed down the diameter and profile of the round bit to be the same size as the Honda originals. I still need to tidy up the profile a bit  and also zinc plate them ... I am thinking of two thin O-rings and a bolt and nut through the eyelet to seal the joint before plating. This is deffo one for home plating as I don't know of any commercial platers, who would entertain doing it.

The replacement boots look fairly decent and didn't tear on my test-out assembly, to ascertain if they are rubbish or not. Obviously, I will have to use a fixing for the normally peened over pin used on the lever parts but that's no big deal.

Joint before modification.

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Joint after modification and replacement rubber boot.

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Test assembled with Rubber boot
 
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CB250RSA Boot Kit

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Rose Joints on Ebay (L&R hand thread m6)

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