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Topics - 350Simon

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CB350/400 / Acceptable / normal oil consumption

« on: September 14, 2022, 11:10:37 AM »

What would be considered normal for a 350/400 sohc?

I've done 500 miles of running in new pistons and rings, the bores were properly machined and honed and I know that my valve guides are on the upper end of the serviceable limit.

Oil level is just above the min mark on dipstick after 500 miles. Is this acceptable or should I really get the head reconditioned?

I'll be honest I can't detect any smoke from the exhausts in my mirrors while riding or at idle but my friend said the other day there's a faint haze when I'm giving it the beans.

Cheers
Simon

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CB350/400 / Fuel tap causing flooding?

« on: August 07, 2022, 12:48:48 PM »

When I bought my 350f the dealer said 'always run these old bikes in the reserve position'....... in other words there's a problem with your fuel tap but I don't want to tell you haha

Anyway it runs great so no issues there, yesterday out of interest I thought I'd put the tap in the on position and see what happened. Literally 15 seconds later fuel is pissing out all 4 overflows onto the drive. Turn it to reserve, fuel stops flooding out the carbs.

Started engine with tap in reserve, lovely idle and good response. Turn tap to on position, bike starts spluttering and flooding carbs again.

Could it be that the tap is broken? It seems very odd to me as you'd expect if it was a float / seat issue it would also flood in the reserve position. Anyone had this before?

Cheers
Simon

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CB350/400 / New piston rings

« on: August 07, 2022, 09:10:07 AM »

So I've passed my test woo hoo!

The dealer I bought my 350f from told me it had just had new piston rings fitted and a de glaze, as it was apparently smoking a bit.

It's not been rebored just what sounds like a light hone and new rings fitted. He did 140 miles on the bike and cured a few oil leaks which was good of him but told me to ride it gently for a while keeping the revs between 5 and 6k if possible.

Question is how many miles until I can let it rip?

Bike runs great, no smoke at all and no oil leaks. There's a really annoying vibration between 5 and 6k which reading period road tests is normal for a 350f but I feel I'd be better not staying in that zone for too long. Can I use more revs to bed the rings in if I keep them varied?

Cheers
Simon

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CB350/400 / Exhaust preservation

« on: July 06, 2022, 02:00:47 PM »

I've got a cb350f fitted with a brand new 4 into 4 exhaust system. It's a David Silver aftermarket system.

Are these as prone to rust as the originals? I'd like to preserve it if possible as I have the sales invoice and I'd rather not have to replace it any time soon!

Someone I work with suggested removing the system, filling the pipes with gear oil, draining and then running the bike until the smoke disappears. Apparently it varnishes the inside of the pipes and helps to preserve them?

Has anyone done this and does it work or is it an old wives tale?

Cheers
Simon

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New Member Introductions / Hello!

« on: July 01, 2022, 04:55:08 PM »

Good afternoon,

Just thought I'd say hello! I'm new to motorcycling but not new to classic vehicles, been in and around them for a living and for fun for many years. Last year I bought a 1973 125s to learn on, blew it up twice and rebuilt it twice but had many happy miles of riding! I've passed my MOD1 and have my MOD2 test booked for 2 weeks from now so last week I part exchanged my 125s for this lovely 350 Four at a dealer near me.

I've got a few bits to sort on it over the next couple of weeks and then hopefully if I pass my test first go, plenty of happy miles to be had!

Cheers
Simon