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Abarth

1970 Honda CB250k Super Sport

27 posts in this topic

New box of Honda bits arrived, installed new air filters, new rubber carb mounts, battery strap and clutch cable.
 
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Old ones were fairly rooted
 
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Popped open the clutch cover to see this mess, 45+ years of grease mixed with dirt. Cleaned in up and banged the new cable in. Adjusted the clutch bite and took it for a ride. Totally changed the feel of the bike! Clutch is smooth and gear changes are direct. Stoked, simile on dial achieved. 
 
/ cool exhaust baffle, i'll replace this soon. 
 
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Thanks for looking!

 

 
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Been riding this as my daily, everything was running good except the battery kept going flat.

Found these specs on the net: 

CB250 = 110W output (~8A)
1156 bulb draw - 27.3 watts EACH (1.93A)
1157 bulb draw - 26.9 watts full (1.92A), 8.3 watts running (.6A)
Headlight - OEM - 25W/35W (1.7A/2.5A)
coil charging (assuming 5 ohm primary resistance, 14.5 volts) - 42 watts (2.9A)
neutral/indicator bulbs - 3 watts (.2A)

So the charging system wasn't up to the task of keeping the battery charged while riding round with the headlights on 100% of the time. To fix this I upgraded to LED bulbs which use about 1/8 the power; brake light, park lights and gauge lights. Way brighter now and the battery stays topped up.

 

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Next mission was to upgrade the way it went round corners, with blown front seals weeping milky fork oil and shocks on the rear which looked like the factory ones it was lose in the corners. Offered a lush ride over bumps but thats about it. 

Got some new rear shocks and painted the tops black to blend into the bike better.IMG_3676.JPG

 

 

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The tires on it also looked about the same age as the shocks so they were binned for new ones, I liked the ribbed vintage look so I got some new Chen Sheng and Maxxis tires.

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Then had a massive day at the workshop;

Installed new rear shocks

New tires, inner tubes and rim tape

Stripped and rebuilt the front forks, new genuine Honda seals and fork oil.

New brake shoes, lubed the brake drum mechanisms.

Tided up some rough as guts wiring around the points.

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Rides well now, handles solid round corners and the brakes actually work. Stoked!

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Added a new chain, front and rear sprockets, what a difference! Since this is my first bike and all my previous two wheel rides were Vespas I had no idea the old chain had so much slop in it. Also banged in a genuine Honda oil seal behind the engine sprocket just for future piece of mind.

After a lot of work she seems to be running good mechanically now so the focus is on to tidying this up externally. I'm torn on keeping that big chrome, stock fenders classic look or cut everything down to create a cafe racer. 

In the mean time I brought new mufflers to replace the old rusted out pieces. They came with the thinnest sound baffle already (yellow) so I added an extra sound baffle kit (white) to reduce the noise. Goes well now, although I need to have a fiddle with the carbs again to balance them out, one header pipe had a baffle jammed in it and the other side didn't.

Who knows why but I removed it so both cylinders flow at the same rate. 

 

 

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Was pining over tire stickers on some instagram cafe racers so decided to get some for the Honda. Loads of different types on tirestickers.com but settled on Yokohama Advan being a Japanese  bike and all.

I have the Advan stickers to add on the opposite side of the tire, so far so good.

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I decided I like the factory chrome look so I added genuine Honda indicators to replace the old rusted out ones. I painted the triple tree and handle bar mounts in VHT Epoxy satin black. Slowly getting this bike tidier.

Now these bikes are know for their charging systems being weak, a common mod on these is to remove the old regulator and the rectifier and replace it with a modern 2 in 1 regulator/recifiter unit.

Got started pulling out the wiring and noticed it was pretty rusty round the battery holder so that all came out for a freshen up. Can see the factory regulator tucked under the bottom of the battery tray.

 

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All removed

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The original regulator wiring is left disconnected in the loom. The original rectifier (orange fins) is removed and the wiring for this is used for the new regulator/rectifier unit. 

Yellow and Pink wires are from the alternator, green is earth and red is positive. 

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Cleaned up the battery holder, stripped to bare metal and gave it a couple of coats of epoxy paint. Luckily the new regulator/rectifier bolt holes almost lined up to the original regulator holes on the bottom of the battery holder. A quick file to slot the holes and bam fits mint. Added some super seal connectors for reliability and bolted it all back together.

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Gave it a polish, as it stands now:

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