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Discussion Starter · #1 ·
Hi there. I've been having this problem for an ongoing long time and im getting sick of spending money and it ride's fine for a day then the next it's buggered again. Unfortunatly i live in south africa, so there ain't much part's available for the cbr250 here.

My primary concern is that a cbr250 mechanic has said my valve clearance is out. How ever, this same mechanic worked on my bike before it started the new problem.

I first had a problem with it overheating, fixed this with a new pressure cap.

My second problem was that my needle & seat were worn, so i sent it to the cbr250 mechanic to get them replaced, he then gave me the carb's to put back on the bike and take it back to him. At this time i had the cr9e-h9 spark plug's in.

I put the carb's back on and then tried starting it, no hope. Phoned him and he asked me to bring the hole bike in. So i did.

Sadly, the problem to it not starting was me not putting the carb's correctly on. And before i sent it to him, i tried push starting and just starting(with car off), i even tried recharging the battery.

It would not start. So i sent it to him and he then proclaimed that my starter motor was burnt out and blah blah blah, and i got the bike back in starting condition.

I brang the bike back home on a trailer, and never rode it till the next day. When i rode it, after about 5 minute's of riding, it would start splattering.

I phoned him immediatly to ask him what the problem could be, and his response was that my 3rd spark plug was fouled and he put his cr9e-h9 spark plug, as we both bought from the same place.

I left the bike stand for about 2 week's when i came back to start it up and it started, but i rode it and again 5 minute's later it would do the same. So i wanted to get it riding.

I had 4 K&N filter's on directly from the carb's, i made a plate at my dad's workshop to connect the carb's to the filter's. I thought maybe it's pulling in to much air, so i put the original airbox on.

And wonder's it started fine. Rode it again and bam, start's splattering again. My only option was to replace my spark plug's again(4th time in 1 year).

I replaced my spark plug's on the saturday, with no luck again it started splattering. I phoned this mechanic up and said, hey what's up, it was not doing this before i sent it to you.

His response was it could be my valve clearance is out. How ever, how could my valve clearance be out if my engine was never opened, and it was correctly fine before i sent it to him the first time.

Now he want's to charge me $70 AUD to set my valve clearance.

I'm afraid that when i get the bike back that it will do the same problem. Can anyone tell me how to notice if my valve clearance is out? Or if my valve clearance is actualy out that it's causing the chaos of splattering?

Thank's.
 

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alright bot! where u from in s.a?

just had quick read. if you have pod filters, you should have different jets in the carbs, do u?
 

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i think drew was saying (or maybe it was studricho) that the pod filters can cause turbulence, which can affect the airflow. not a huge issue on single carb stups that you see on cars and lower performance bikes, but the CBR carbs can be finicky if they aren't balanced.

is that a typo? $70 aud for clearances? because a mate got charged $900 for his (utter bullshit imo)

if that is the case, do it anyway.

its really difficult to diagnose over the net. we can only guide you to do stuff.
 
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Can I just ask is this an mc19 or an mc22? This sounds to me like a fuel delivery issue if it is indeed "spluttering" as you say. Cbr250's are easy to fix on a budget, but it's hard to diagnose problems over the Internet.[hr]
Oh and it sounds like it needs a good balance and tune too.
 

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Discussion Starter · #5 ·
zane said:
alright bot! where u from in s.a?

just had quick read. if you have pod filters, you should have different jets in the carbs, do u?
I am from port elizabeth. If you would of taken your time to read throughout, you might of noticed i said that i put the stock airbox back on and it did the same? But to answer your question, no, i do not have different jet's in the carb's, but it was balanced.

Matt said:
i think drew was saying (or maybe it was studricho) that the pod filters can cause turbulence, which can affect the airflow. not a huge issue on single carb stups that you see on cars and lower performance bikes, but the CBR carbs can be finicky if they aren't balanced.

is that a typo? $70 aud for clearances? because a mate got charged $900 for his (utter bullshit imo)

if that is the case, do it anyway.

its really difficult to diagnose over the net. we can only guide you to do stuff.
I've already switched back to the original airbox, it was a loss tho, i lost quite a kick in acceleration :(. And yes it was balanced for the pod filter's. I doubt there was any turbulance, as the plate that i made for the airbox to fit for the filter's was in directly into the correct carb, and it had seal's also.

Nope, it is not a typo, google it yourself. Mechanic want's to charge R450(rand) which work's out to somewhat 69AUD. So yeah, i do think of it as reasonably cheap.

cbrpledge said:
Can I just ask is this an mc19 or an mc22? This sounds to me like a fuel delivery issue if it is indeed "spluttering" as you say. Cbr250's are easy to fix on a budget, but it's hard to diagnose problems over the Internet.[hr]
Oh and it sounds like it needs a good balance and tune too.
It's actualy the 1986 mc14.
 

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the valves can be out due to build up of carbon from exhaust gas.

do you know the history of the bike?

because if the valves haven't been done, or you don't know when they were last done, its prolly time to do them.

i have a 98 vtr with 40,000ks on it here, and the valves are being done on the next service.
 

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i'm not sure what the problem is
but 70 bucks is way too cheap for a valve clearance
here most mechanics charge 100 bucks for an hours labour
and as far as i know, i don't think the valve clearances can be done in an hour

so if the mechanic is reliable, get it done anyway
 

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HauntedDawg said:
If you would of taken your time to read throughout
He took the time to reply to your post to try to help, is that not enough?

Justin.
 

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Discussion Starter · #11 ·
viper33 said:
i'm not sure what the problem is
but 70 bucks is way too cheap for a valve clearance
here most mechanics charge 100 bucks for an hours labour
and as far as i know, i don't think the valve clearances can be done in an hour

so if the mechanic is reliable, get it done anyway
Well, i guess south africa is cheaper then eh? :lol:

sir.b said:
HauntedDawg said:
If you would of taken your time to read throughout
He took the time to reply to your post to try to help, is that not enough?

Justin.
I was not meaning it in a angry way. There was no offence intended there.
 

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Discussion Starter · #12 ·
Is there anyone that can tell me if it is the pickup or the valve clearance?

If it's the valve clearance, what should i be looking for to notice if it's that and not the pick.
If it's the pickup, what would be the notice for the pickup and not the valve clearance?
 

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Discussion Starter · #14 ·
I'm getting the valve clearances done tommorow, and will be getting it back on friday, as he say's he is busy with other bike's for the bike rally that is coming up here in south africa.

I just hope it is the clearance's and not the pickup.
 

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Discussion Starter · #15 ·
Sent bike to get valve clearances, hopefully getting it tommorow. Anyway's, as i was remembering when i changed to my POD Filter's, i removed these rubber's that come off the carb into the airbox, you can see them here:



However, i only had the two inner one's. Do these need to be there? Or can they be removed?

By the way, as anyone got a parts catalog and service manual? And if it's the service manual that just show's you the spec's, i already have that one, im looking for one that show's you step by step how to remove and reassemble thing's on the CBR 250's, thank's.
 

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Discussion Starter · #19 ·
According to him he said the diaphragm was cut out of the petrol tap. My petrol tap is completly open, it alway's runs through, it's damaged and need's replacing. How ever i will see if it really need's replacing when i get the bike back tommorow. And if he has not stripped the tappet cover off yet then im going to ask him to try out a petrol tap (CBR250 mechanic only).

Show me some pic's of your mc14, would like to see how it look's :)
 

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Discussion Starter · #20 ·
I just got a phone call from him when i was supposed to get my bike back tommorow. Unfortunatly, he say's inside the tappet cover it look's like milk breakfast and refuses to work on it. So i guess i'm just going to pull it all down myself and do a rebuild.

Be sure to post the pic's in the project section.
 
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