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Messages - HWG27

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1
Other Bikes / Re: CB250RS Rebuild Progress
« on: July 27, 2018, 06:41:59 PM »
Quote from: Laverda120 on July 27, 2018, 05:51:26 PM
You have made a lot of good points Nigel.
I have checked the electrode on the plug with a magnifying glass and it shows no sign of burning.
The mark on the head are fine particles of the piston.
It could be the ignition module as you and Bryan say, the only   answer I can provide on that is its the original ignition module before I rebuilt the bike.
Going back to your previous post I think may provide a possible clue, the piston material as it was a pattern part? Could this be the cause if the material used wasn't up to Honda spec?
My biggest question though is where did all the oil dissappear to over the 200 miles when I checked it (when it was just under maximum). It hadn't used any oil in the first 200 miles and it was leaking any or burning any (I followed the o/h for a good while to check if it was burning any and to check if it was running rich (it wasn't). When I stripped the bike after the blow up there was about an egg cup of oil in the sump but a lot of oil type mist in the air filter chamber, I imagine this was as a result of blow by following the piston damage?
The good news is the engineer has begun the crankshaft rebuild today. I have the new mains and conrod. He's going to see how much he needs to remove from the cylinder bore and let me know what size piston I need. When he does I shall ask the piston supplier if they can advise of the materials used and if they are the same as a honda piston. If I can find a genuine piston and rings I'll use those but I think they are even rarer then a sandcast CB750!
Thanks for you help  :)

I've only just caught up with this and seen the photos in the other thread. What a shame that is. I've only ever done that with 2 strokes and that was both times a simple high compression/low octane incompatibility. It's  a very unusual thing to happen with a bike like that.  I have a spare CDI lying around somewhere that I know to be good, and you'd be quite welcome to try it. These thing do though tend to either work or not. I would not have thought it possible that the CDI would suddenly advance the ignition for instance. I'd be looking at the mixture tbh. Pattern piston should be fine imo. There's plenty of wiseco xl250 stuff about that you could use, although you pay a premium.

2
Other Bikes / Re: CB250RS Rebuild Progress
« on: April 13, 2018, 12:57:54 AM »
Quote from: Laverda120 on April 03, 2018, 08:51:54 PM
Huw, here's a better photo of Menno's excellent work. You can see the centre tank section has been perfectly matched to the tail decal. The lacquer looks like glass  :).

Looks fantastic.
Little progress from me as a flat/dead car battery stopped me getting my engine reunited with it's frame until today.
I called in at Allbike Engineering on the way to discuss the rocker pin problem and the general consensus was that the rockers/tappets were good, so as you'd suggested, leave 'em in.

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Other Bikes / Re: CB250RS Rebuild Progress
« on: March 07, 2018, 07:33:54 AM »
Quote from: Laverda120 on March 06, 2018, 05:32:12 PM
I have used Piki, he's a forum member on here. Piki made the decals for my 400/4 and did an excellent job. I've seen the kits on ebay, some good and bad reviews though. For me there's only one person and that's Piki.
The centre section of the petrol tank is painted but the two thin white lines either side are decals. The centre section of the rear seat cowl is also a full decal.
Post some photos of your rebuild, we all like a restoration  :)
Yes my point about the central tank part is that Honda do not list the colour so it seems to me that the only way of getting this right is to get paint matched to the tail piece decal. Is that what you have done ?
I've not been too active recently but hoping to put engine in frame this weekend. So maybe photos then. It doesn't help that the frame is in a different location to where I live. Still haven't sorted the cam pin problem though.

4
Other Bikes / Re: CB250RS Rebuild Progress
« on: March 06, 2018, 02:07:21 PM »
Quote from: Laverda120 on March 06, 2018, 01:11:45 PM
I'm sticking with the original blue Julie. I was going to change it to red but I've had enough red bikes!
Menno had a few problems obtaining the exact match but these are now overcome and he's in the process of completing the repaint. Piki has made the decals and sent these on to Menno.
I can't wait to see the finished result and neither can the O/H as it's going to be her bike :). Hopefully we'll get some miles in over easter.
Thanks for the nice comments Spitfire, the snow's gone and the temperature is nearly tropical compared to last week so your garage is calling for you  ;).

Hi,
Is it someone on here that has made your logos ? I can see a couple of firms on ebay do them. Do you know anything about these or the quality. I will be redoing mine in the original cosmo balck.  One problem I have is that the blue on the middle of the tank is not listed by honda. Only thing I can think of is to buy a logo set and then get those matched to paint. Or even paint all the blue bits.

5
Other Bikes / Re: CB250RS Rebuild Progress
« on: December 05, 2017, 03:39:47 PM »
No I probably didn't or don't need to take them out. Just that while I'm cleaning/painting everything it seemed worthwhile doing that. Would rather replace them now.  I certainly would've gone for a new balancer chain if I'd realised there were ready made replacements available, especially at that price. I've got bottom end pretty much together now though and reluctant to split cases again for this.

6
Other Bikes / Re: CB250RS Rebuild Progress
« on: December 04, 2017, 07:47:02 PM »
I'm halfway through my wheels. Rear has been respoked (stainless) and the front will be going to hagons within the next week. It's not a nuts and bolts restoration so I've made my wheels nice and shiney.  8)
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I did have roadriders fitted but have dumped these, mainly because they were oversize. My own fault. I've got some soft heidenau's to go on.

Also I have fitted a twin pot caliper and larger disc, which possibly came from a 750 but could've been from pretty much anything.

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7
Other Bikes / Re: CB250RS Rebuild Progress
« on: December 04, 2017, 07:27:30 PM »
That's a good article. Didn't appear to have any particular problems with those rocker arm pins.
Here's the status of mine.
After dremmelling a grove [ Guests cannot view attachments ]
After tig attachment has broken off [ Guests cannot view attachments ]
After one last desperate wrench with the mole grips. [ Guests cannot view attachments ] .

Last chance saloon with the drill next.

8
Other Bikes / Re: CB250RS Rebuild Progress
« on: November 29, 2017, 03:21:34 PM »
Hi,
I'm new on here and stumbled accross this thread by googling 'removing cb250rs cylinder head cover pins'  ;D
I wonder how you eventually got those out ?
I'm at the stage where I have dremmelled a groove in them but still nothing is budging. Was going to attempt to Tig something on them this coming weekend, just a bit wary of melting the bloody thing.
Really interesting thread (for me at least) as I'm in the process of renovating an RS myself and have bits all over the place right now.
The chroming you've had done looks great. I got several quotes for some of the same parts (without gear change, brake pedal and kickstart) and prices were just too much, double what you've paid. Going to try a bit of DIY nickel and see how that turns out.
Anyway, will be following with interest.

Regards,
Huw



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