Honda CB250n SuperDream Refurb: COMPRESSION TEST RESULTS

Thursday, April 07, 2011

COMPRESSION TEST RESULTS

Well, after sending off for that 12mm adapter for my compression gauge, I'm pleased to report that it was a waste of money, LOL. The readings on both cylinders was a whisker under 180psi which is pretty amazing considering that it's a 31 year old engine and it should be 185. WOW!

So I am now a much happier bunny knowing that I don't have a broken piston-ring or a sticky valve. I can now focus elsewhere and I have almost no doubt that the problem is electrical based. I just need to fit the carbs back on (with the new inlet rubbers which arrived today) and start looking at the alternator and/or pickup-coil.

See you next time!

2 comments:

Klaas De Craemer said...: That's great to hear. It rules out a lot of possible problems :); 8 April 2011 at 07:35
Anonymous said...: Hi guys!

I have been following this great blog for a while but have now realised I won't have time to finish the project I started in the autumn.
I have 2 Honda CB250N Superdreams from 1980 and 1981.
I bought them last autumn from a guy who had them parked up in his heated garage for the last 10 years or so. All there is needed to have two complete bikes is a new exhaust on one bike and a battery for both of them. I just got them both running and the electrics working again.

My problem is that I can’t store the bikes where I live and have to drive 45min to get to the bikes which are in a friend’s garage.

It is the perfect project!

Look up this ad on Gumtree to see pictures.
http://www.gumtree.com/p/cars-vans-motorbikes/not-one-but-two-honda-cb250n-superdream/77031042

Any questions just shoot!

Regards
Christian
c.studsgaard@hotmail.com

PS. Bikes are in Mepal west of Ely.; 10 April 2011 at 10:16

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IN THE BEGINNING....

Way, way back in August 1980, I was working as a young steel-erector in Newcastle Upon Tyne and around the corner from where I worked was "Ken's Motorcycles" on the West Road. In the window was a brand new CB250N Superdream in shiny black - and I wanted it! So I got got the brochure (shown below), begged my future father in law to act as guarantor and signed on the £820 dotted line.

I loved that bike - it got me back and forth between Bolton and Newcastle with no problems or hiccups and lots of fun. From memory, it did something like 60 miles per gallon and could burn off most cars. What else does a young lad want?

Anyway, 28 years later, I decided to get another one and refurbish it over the winter months. I've done similar projects in the past and really enjoyed them, so I'm hoping that this one turns out as well as the others. Having said that, this project will be a REFURB as opposed to a rebuild.

The donor-bike looked to be in pretty good shape at first glance, but as usual, it all turns pear-shaped when you remove your rose-tinted glasses and start to see what's REALLY there!

The first thing that I want to do, is spend a little time finding out whether or not the engine needs a rebuild. If it doesn't really need it, so much the better. If it does need doing, then there'll be a significant delay as I spend time clearing out the garage to give me a lot more space.

I estimate that this project will take 3 or 4 months to complete but due to other interests/hobbies, it may go longer.

So, I'll start off with a few photos of the bike in its current condition and then log the progress of the refurb as I go along. Please feel free to comment or offer advice. Hope you enjoy!

Tom

http://www.mcqart.com/

SEE ALSO... HONDA CB450 K1.