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Messages - blackeagles

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1
SOHC Singles & Twins / CB250T
« on: February 28, 2024, 10:19:37 AM »
I have not been on the site for a while (cancer) but after 3 odd months of 'nil by mouth' and an operation I have lost a lot of strength and as I cannot manage the 750/650 anymore I thought I try a 250t.

I know most will say they like to rev but it's a bit much to me so I was thinking of changing the gearing a bit.  The stock is 15/40 and 'Gear Commander' says going up to 17/40 will drop the revs by about 250 at 8k (60mph).

Anyone done this or similar??

It seems to me the options are :

1 - stay with 15/40 and put up with it;
2 - go to 17/40;
3 - try 18/40 (not sure it will fit in and I would have to change the chain) or
4 - go 17 but lower the wheel sprocket to say 35 ish (no idea what rev saving this is)


Any comments?

2
SOHC Singles & Twins / 1981 CM250T
« on: March 11, 2023, 07:17:22 PM »
Can anyone tell me if the original speedo fitted to a 1981 CM250T is a max of 80mph or the 100mph one; both of which I have seen advertised for sale for the CM250T, I'm just interested how come a bike which is supposed to have a top speed of 85 would have an 80mph speedo.

3
SOHC Singles & Twins / Re: 1981 CM250T
« on: March 10, 2023, 09:34:15 AM »
I'd have thought 100 as it would do 80 and they always seemed to put extra MPH on there just to fool you that it could do it. It couldn't.

That is what I would have thought but it has an 80mph speedo which, it seems to me, would be for the 185/200 bike and the 100mph for the 250 and 400.

4
SOHC Singles & Twins / Re: 1981 CM250T
« on: March 09, 2023, 12:05:33 PM »
Someone has to be the 1 in 3 to get it!!

5
SOHC Singles & Twins / Re: 1981 CM250T
« on: March 09, 2023, 10:42:23 AM »
I do like the way your bike stands as you look at the  photo  - the seat & bars look comfy with a clean classic type design of the period.

Thanks.  Luckily you cannot see the other side of the tank which has a scratch.  I have to buy it as I have been in hospital for some months and am as weak as a kitten at the moment and cannot use the CN650Z or my Triumph as both are too heavy to move around.

6
SOHC Singles & Twins / Re: 1981 CM250T
« on: March 09, 2023, 10:23:17 AM »
I used to adjust every service

A 'off on a tangent' question.  Was the original fit of speedo a max of 80mph or the 100mph one; both of which I have seen advertised for sale for the cm250t.

7
SOHC Singles & Twins / Re: 1981 CM250T
« on: March 09, 2023, 10:15:48 AM »
Ok, then that looks like my first job to check.  Thanks again.

8
SOHC Singles & Twins / Re: 1981 CM250T
« on: March 06, 2023, 01:50:57 PM »
Most were out of adjustment on the 500 mile service. I was regularly removing the clutch cover so I could move the adjuster on the splines. I was the only mechanic who used to do it, everyone else just removed the chrome screw in part, release the lock nut, let it drop and put it all back together again. Even at 500 mile they could clatter if not adjusted properly. I was also the only one to balance the carbs and they were always out of adjustment. Liked working on the 250N motor, so simple, so accessible.

What is the number of miles as stated in the workshop manual for the adjustment?

9
SOHC Singles & Twins / Re: 1981 CM250T
« on: March 06, 2023, 01:35:23 PM »
I'm starting to think I should have gone for the 250N SuperDream

10
SOHC Singles & Twins / Re: 1981 CM250T
« on: March 06, 2023, 11:44:22 AM »
The engine has two balance shafts connected to the crank by a chain which has an adjuster, if you dont understand the system and adjustment procedure after reading the manual dont buy the bike as its a very important service item

It seems simple enough (famous last words) just to adjust it but a bit of a pain to have to replace the chain or plate.

11
SOHC Singles & Twins / Re: 1981 CM250T
« on: March 06, 2023, 11:10:31 AM »
RSbikepaint website gives it as

Candy Bourgogne Red / Brownish Red Metallic

Don't know if it's accurate or not.



Thanks I will have a look at their site.

12
SOHC Singles & Twins / Re: 1981 CM250T
« on: March 06, 2023, 11:09:34 AM »
One of my BILs had one of those in blue, he loved it. Even now he hankers back to it although I think he'd prefer the CM400T version for the extra power these days.

Make sure you check the balance chain adjuster, it runs out of movement room real quick and you need to remove it and move it a few splines to get it to work again.
Forgive my ignorance but what is a "balance chain adjuster"??

13
SOHC Singles & Twins / 1981 CM250T
« on: March 05, 2023, 11:03:27 AM »
I'm buying a 1981 CM250T with a bit of paint damage to tank.

Anyone know the paint name and/or paint code of the light red and dark red 'decal' with the Honda badge of the tank?

14
CB650 / Re: 1981 cb650z - carbs
« on: October 01, 2022, 04:35:04 PM »
Well, just an update - I have finally taken the carbs off (what a struggle) and they are all clean, not even dirt in the bowl.  All the jets including the pilot (which I took out) are clear.

Sure my pilot screws are 2 1/2 turns out.

I'm going to set them at 2 turns out for the time being (I am assuming the more out it goes the richer it is?!?)

Anyone else with a PD51a on a 650/650z and know what setting the pilot screw is????

15
CB650 / Re: 1981 cb650z - carbs
« on: September 03, 2022, 12:24:12 PM »
Sure my pilot screws are 2 1/2 turns out.

well the carb cleaner may have worked - not really possible to tell - but if I set the pilot screw to 2 1/2 out (like you have) it runs well enough allbeit with a 'spit back' or two when its cold but needless to say now number two overflow is pouring petrol out so the needle is jammed down again.

talk about a step forward and then one back!!

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