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Discussion Starter #1
Was out getting petrol for a run , and although the bike was runnin fine b4 the station , when i left i started getting a nastly rattling sound coming from the roght hand side of the engine ... so i headed back to work .

On closer inspection i noticed that i am out of oil !!
Why didnt the red "oil" light come on , and if re-filling up the oil doesnt make a difference to the rattle what could be wrong ?

Ive had the bike 1 month and so far it has been stolen and had faings broken , can someone give me hope that i dont need to spend a fortune fixing the wee bike .

i instantly took it easy on the way back to work , so im hoping ive not done lasting damage in that short "dry" period .

I hope someone can ease my mind , thanks guys
 

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I think you'll have to do an oil pressure check to ensure you have pressure.
If you don't have pressure then it's probably chewed a bearing.
The light on the dash or the sender itself may not be working.
The oil light should probably come on while the engine is off as a test but I'm not familiar with the babyblades.
 

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Discussion Starter #3
Thanks 4 the advise . i have had a couple of ppl also mention the cam chain tensioner ?

The funny thing is that i had been noticing a little power decrease also during the last week . it was just suddenly when on a roundabout i noticed it starting to ping/rattle ...
now power is down LOADS !!

Im anxious to find that the engine can be fixed .. cos i cant afford to pay a fortune to fix the bike at the moment.

funnily , it seems that the ping/rattle goes in sync with the exhaust sound !!?
and also the bike wants to KO alot .. it wont idle too long

seems like its kinda flooding.

Do u think i mite hav to get a new engine maybe ?
What is this bearing bit , and where is it located ?
 

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Pinging could indicate overheating and low coolant can make the engine sound noisier.
It certainly could be the tensioner but that's not usually something that just appears after running the engine low on oil.
How much oil did you need to top it up with?
Is it still full of coolant?
When you say the noise is in sync with the exhaust I assume you mean if you rev the engine the noise gets faster as well? That could be due to any moving parts in the engine as most of it moves faster with revs :)
I have no idea if you need a new engine until you carry out some tests.
The crank bearing clearances determine your oil pressure. If you run the engine low on oil and overheat a bearing the clearance can open up and reduce pressure.
It's probably well worth pulling the valve cover off and inspecting valve clearances and camchain as well as the tensioner. If the tensioner has failed one of the cams may have skipped a tooth on the chain so the cam timing could be out as well.
 

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the thing is,from what i remember the 250 and 400cc blades,had gear driven cams....thus there is not a CCT.They had a special "whining" sound from the gears.
 

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You're right I think.
Did all of them have gear-driven cams?
 

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Discussion Starter #7 (Edited)
cheers , that clears it up a little for me . i needed over a litre of oil !
I knew that bloody oil light was playing up , now and again itd flash on for a few seconds then not come on again for days or more even .

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

the only way i can ride is by shifting up gears quickly to keep it below 6k ... ok so i get a nice low hummmm with no rattle , but it doesnt compare with the usual engine sound .

i'll maybe hav to keep riding like this until i get cash from a friend for my mito and buy another bike . im gutted :crap: as i really 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 .... :idunno:
 

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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 .... :idunno:
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.....:thumb:
 

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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? :smilebig:

You may find it's cheeper to replace the whole lump than pay someone to fix it.....:thumb:
But what about the vehicle registration? Different frame and engine number and all that...
:eek:

This might be just me, but I'd rather deal with a garage than the DVLA ANY DAY!! :O
 

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But what about the vehicle registration? Different frame and engine number and all that...
:eek:

This might be just me, but I'd rather deal with a garage than the DVLA ANY DAY!! :O
Just change the engine number on the log book and send it in to be changed.. easy peasy :thumb:
 

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Discussion Starter #14
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
 

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Discussion Starter #15
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 ... :clap:
 

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Discussion Starter #17
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
 

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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 :)
 

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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 :)
 

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Discussion Starter #20
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
 
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