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Thread: cbr250 engine rattling !!! help Reply to Thread
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  Topic Review (Newest First)
10-15-2008 5:38 AM
streethawk
Re: cbr250 engine rattling !!! help

The guy i spoke with at S.E.P is asking 400 for the labour and has told me to expect around 200-300 for the parts .

To be honest , Honda centre just couldnt be arsed doing the work ( and also the say they can only get officail parts , possibly costing a fortune from japan ) .

overall its the most realistic option available to me really .
A re-bore would be a boost surely
10-14-2008 1:35 PM
bladeracer
Re: cbr250 engine rattling !!! help

If honda wanted two grand what does the other place want for the same job?
10-14-2008 1:28 PM
streethawk
Re: cbr250 engine rattling !!! help

took the engine off , and hav sent it to a reconditioning specialist to hav the work done ( honda centre was talkin 2000 + for a rebuild !! ) .

Cant wait to get it back, and on the road again ... and get wheelying haha
10-01-2008 9:15 AM
bladeracer
Re: cbr250 engine rattling !!! help

I just checked the manual for the 250 and another option might be to machine the shaft of the third cam gear to move it back perhaps one mm to allow for lowering the head by milling it.
I think they still race them in Japan so it might be worth learning Japanese and hitting some Jap 250 racing forums :-)
10-01-2008 9:10 AM
bladeracer
Re: cbr250 engine rattling !!! help

Quote:
Originally Posted by streethawk View Post
I mite sound daft spending all that cash .. but you know how it is to love your bikes.
Not at all :-)
I get way more satisfaction out of riding a bike I've built myself.
It doesn't matter how long ago I did it I still get a warm fluffy feeling every time I fire up an engine I've built myself.
I wish I had a reason to go into a CBR250 engine. 48.5mm pistons and a 33.8mm stroke running to 20,000rpm - awesome!
When you get it apart I'd love to know the rod dimensions and weights of the rods, pins and pistons.
A turbo would be a great project as well for one of these little suckers :-)
One drawback to the gear-driven cams is you have to replace the pistons just to raise the compression. 11:1 is way too low for those little pistons so I'd definately be looking for higher-compression pistons if I were rebuilding one. Being four-stroke though (because of the valve area required) pistons that small are going to be tough to find I think. Most of the companies will make custom pistons to your spec but you'd have to check if they can make them down to 50mm diameter. Of course, if the 400 barrels and pistons drop onto the 250 cases then that'd be a plus :-)
10-01-2008 6:43 AM
streethawk
Re: cbr250 engine rattling !!! help

Well i took the bike to my honda service centre , and hav been told that one ( at least ) of my conrods sounds knackered .

I'd contemplated an engine re-build when i got the bike actually , so i could get that F1 sound ... but in the end i decided against it .

Now i hav little option really . i'll hav money from my mito tomoro , so thing are working out for the better in a way .

I mite sound daft spending all that cash .. but you know how it is to love your bikes .

Thanks again
09-30-2008 4:36 PM
bladeracer
Re: cbr250 engine rattling !!! help

Quote:
Originally Posted by streethawk View Post
its seems as tho im settling for an engine rebuild (if i cant find a GOOD engine )
Have you determined that the engine needs rebuilding yet?
09-30-2008 4:31 PM
streethawk
Re: cbr250 engine rattling !!! help

thanks for advice chaps , ive been surprised at the quick response

so , its seems as tho im settling for an engine rebuild (if i cant find a GOOD engine ) and also tyga rc211v style fairings , to bring it up to date . Black is the colour

And to finish it all off .. the de-restricted cdi so i can get better sparking at higher revs ( 20,000 revs not 18,500 ), and a proper race can .
Ive heard the F1 kinda sound a good cbr250 can give ... i want it . I'll always keep the 250rr , as i can save up enough for an r6 really ..

Thanks to the mito , life will be sweeter than b4 .
good ridance to her too , the pest ...
09-30-2008 12:23 PM
streethawk
Re: cbr250 engine rattling !!! help

I was thinkn bout that , but i dunno if the engine would be to heavy for the suspension/rearshock ... or the frame for that matter .

The friend who sold me the bike said that it did this a couple of years back , and when he put the bike in for servicing it turned out to be a problem with the cam chain . Im gonna get it to the same servicer and see what happens .

If worst comes to the worst my friend is buying my mito , so i'll probably buy a VFR400 ... cos damn i love that bike , the sound and look is class
09-30-2008 9:56 AM
129CBRider
Re: cbr250 engine rattling !!! help

400cc replacement!
09-29-2008 4:45 PM
Sideshow bob
Re: cbr250 engine rattling !!! help

Quote:
Originally Posted by StrumminRonin View Post
Oh really?! Niiice...... (rubs hands together in glee....)
Yes... Nothing stopping you shoehorning a bigger engine into your Baby when you get bored & it totally legal*

*as long as you inform DVLA, have correct licence, insurence etc
09-29-2008 4:41 PM
CBR Nugget
Re: cbr250 engine rattling !!! help

Oh really?! Niiice...... (rubs hands together in glee....)
09-29-2008 4:39 PM
LoopyLee
Re: cbr250 engine rattling !!! help

Quote:
Originally Posted by StrumminRonin View Post
But what about the vehicle registration? Different frame and engine number and all that...


This might be just me, but I'd rather deal with a garage than the DVLA ANY DAY!!
Just change the engine number on the log book and send it in to be changed.. easy peasy
09-29-2008 4:35 PM
CBR Nugget
Re: cbr250 engine rattling !!! help

Oh yikes. I'd say oil too. Same thing happened to a friend's car - no oil light, no noise, just a lot of smell (of oil), and sudden loss of power. He made it home, and the RAC man gave it some 2 bottles of oil and the dip stick was still barely registering. (Where the **** did all that oil go???) He had to get an engine rebuild in the end. Hope you're in a better position .... [fingers crossed]

Perhaps it's time to get a bore-up kit?

Quote:
Originally Posted by Sideshow bob View Post
You may find it's cheeper to replace the whole lump than pay someone to fix it.....
But what about the vehicle registration? Different frame and engine number and all that...


This might be just me, but I'd rather deal with a garage than the DVLA ANY DAY!!
09-29-2008 4:33 PM
Sideshow bob
Re: cbr250 engine rattling !!! help

Quote:
Originally Posted by streethawk View Post
cheers , that clears it up a little for me .

I need to get it to someone who knows what they are doing . i still feel im doomed tho .

as i love the bike , and its also the rarest paint job , the black n silver one 1990 .

its a sad sad day for me boys , i think i'll go to sleep and maybe this will just be a bad dream ....
keep a Look out for a replacement Engine, check the breakers yards, etc......
You may find it's cheeper to replace the whole lump than pay someone to fix it.....
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