I thought I'd do a blog on a CB77 engine restoration that I'm doing for a friend. It will be a Cafe custom, so we aren't worried about it being 100% stock. Yesterday we tore the engine down completely, and made up a parts list. So far we have all new gaskets, seals and o-rings. We will order a new piston kit, I am really impressed with the Wisco kit that I used in the last one I did, so we will be going that route. A new cam chain, and both tensioner wheels will be replaced. Head and cylinder will be going to machine shop for boring and valve job. New cam bearings will be installed. Also will replace all clutch plates, steel and friction. More items will surely come up as we go along, and I will try to keep a running tab on cost.
Today I did the upper engine case. Removed evrything possible, thoroughly cleaned, bead blasted, polished outsides of case, and cleaned three more times, finally brake parts cleaner and compressed air through all oil passages, bolt holes ets. Here's before and after pics of cases. Next will be transmission. Gears will be Xed, and pics will be posted. I hope everyone finds this interesting.
davomoto
CB77 Engine restoration.CB77 Engine restoration.
So, trans gears have been Xed and installed . They will have to be removed to slide new seals, and kickstart pawl and spring when they arrive. Xing the gears tightens up the ratio between first and second, and second and third gears. Much nicer for riding around town, or running through the twisties. This is accomplished by removing the gears that slide, and the gears that are held on with clips, on both trans shafts, and switching them over to the opposite shafts. Here's a pic of the trans installed in upper sase, and parts page showing which gears are done. I always install trans and crank in to upper case when reassembling.
Nice looking case Dave, I been getting somewhere on my rebuild also. Today I got The weisco 60.50mm pistons bored to fit the ebay dream clys. they look real nice. My trany is also Xed, I read it in an old magazine years ago and tried it. The jump from first to second is much less, which is cool, cause you know how it can be the Big One. The difference from second to third,is close to stock, so that's OK. The only draw back comes between third and fourth, where it is now a big jump. Like you say, at lower speeds, it can't be beat! Also the closer ratio between first and second makes that shift easier to get right. Keep up the good work, post ya later
Where are you getting your seals and bearings??? Really nice looking case mine is in for glass blasting as we speak... I'd like to go through my bottom end but I wasen't sure I could get all of the seals and bearings... Also on the gear xing is there a way to change the fourth gear to reduce the distance between ratios... are their any gears made or from other bikes that might work???
Thanks for the great comments guys! Seal kit came from ebay. A guy in Canada selling them. These can also be ordered from the dealer, individually, or any major bearing and seal supply house. If you look at the parts catalog, it also lists the size of the seal. Such as 14 25 7, or 30 62 8. With these #s, you should be able to get the seals. Same thing with the bearings. I will order from Honda dealer, but one should be able to get these from a bearing house as well with the correct dimensions. As far as trns gears goes, the only thing I know of is Honda used to offer close ratio trans gears for racing, and a compnay called Nova offered a close ratio five speed for racing. The problem with these is first, good luck finding one, and second, first gear is very tall, suitable for the track, but not for the street. Some on this site said that he was told that a five speed trans from a 68 CB350 would drop right in. No one has confirmed or denied this yet. Hopefully someone on this site has or will try this conversion. These bikes are held back by the four speed trans, but we still love them !
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