won't rev up even full throttle

Hi there,
I have exactly the same problem.
Bought the fzr250 3nl 1990, only weeks ago, ran OK at the time of testing before buying.
Took it home on a trailer, rode the next day in morning, OK.
In the afternoon went to take it for a ride and did that, started straight away, but no revs, full throttle, and it just idles, it's as if it is flooded.

Removed tank and cleaned, replaced spark plugs, went OK, for about 1 hr and, did it again.
Cleaned the carbies, went OK for about half hr, then again.
Replaced coils and hi tension leads, ran ok for about one hr test, then, back to square one.
Borrowed a CDI box from a wrecker, no difference. <!-- s --><img src="{SMILIES_PATH}/icon_mad.gif" alt="" title="Mad" /><!-- s -->

Finally gave up and took it to Castle Hill Motorcycles, it's been there for a week and a half and they haven't touched, yet. They promised me that they will look at it before this weekend. I have asked them to diagnose and quote before repair.
As soon as find out what it is I will let you know.
It's got to be something stupid, as it is intermitant. <!-- s:???: --><img src="{SMILIES_PATH}/icon_confused.gif" alt=":???:" title="Confused" /><!-- s:???: -->

If any one out there, has any ideas as what it can be, they will be very welcome.

Michael.

 

Faulty (or missing) fuel pump, weak battery, or clogged fuel vent?

 

When i bought my bike i has isuues like that , but it was every time i tried to start it cold. it turned out to be valve clearences and valve seats.

 

Re: revs

That works for me too.

You might find with yours too that if you do touch the throttle while cranking it over, it won't start and then it will appear to flood.

If this happens, crack the throttle wide open and hold the starter down for at least three seconds. On the third second, release the throttle in one movement.

This will save your battery and the momentum of the crank will see it start.

I took receipt of the bike from Bikebiz after they balanced the carbs and this was the best they could do and advised to never use any choke whatsoever.

Once it does start, you manage the idle yourself at 1/8th of full until it can cope on its own.

 

mat,

how did you manage to get bike biz to work on your fzr. I rang to ask them to work on mine and was told that, thanks, but no thanks.

They refused to touch it. ???? do you know some one there?

 

Hi Orca,

I don't know anyone there.

I had been turned down by another mob at Granville and CHM had done as much as they wanted to after fitting another engine.

Just quietly, I spoke to a bike mechanic at a very reputable shop the other day who told me that he f'king hates balancing the FZR carb's. He has no probs with the other 250's.

@charlu10: crack it wide open as in twist it anticlockwise as far as it will go - ie get hamfisted

 

I got a mechanic that will do anything whots so ever and he does the best job.He is just north of sydney.

 

you seem to have all the good hookups peza. <---- <!-- s --><img src="{SMILIES_PATH}/icon_cool.gif" alt="" title="Cool" /><!-- s -->

would he mind if you pm'd me his shop details.

i don't need his help just yet, but soon possibly.

Thanks
Matt

 

Hi peza,

it would nice to know of some one decent in sydney, I am being stuffed around by this bastards of CHM. <!-- s:sniper: --><img src="{SMILIES_PATH}/icon_snipersmilie.gif" alt=":sniper:" title="Sniper" /><!-- s:sniper: -->

I am at the stage that i would like to go and pick up the bike even if it is in pieces. <!-- s --><img src="{SMILIES_PATH}/icon_mad.gif" alt="" title="Mad" /><!-- s -->

Would you mind pass on the details?.

thanks, michael

 

Hey ORCA, when you get your bike back check if you regulartor is fine, I had major problems awhile back with fuel pump first, than my coils and CDI went at the same time, All I think caused from my reg charging at 20V +. strange things happen when to much volts get through. I have since replaced all those things and bike is running beauitfully, Also check that your EXUP valve is opening, if that doesn't it can cause a block and the gases can't get out through to the exhaust.

 

Hi george,
I have checked the charging voltage prior, and it was just over 13V (13.2V to be precise), so is not overcharging, and the exup valve is working, at least a can see the cables moving back a foward (when it revs, that is) I have not pulled the valve apart.
The guy from CHM recons is a gasket inside the carbys that dried out and sucks petrol through there.... so he is trying to get this gaskets. I asked if that will solve the problem, the answer was, I hope so!! So he is not that confident and neither am I.

michael

 

My mechanic would just tell you straight.Then he would fix it.

 

Thats cool, I hope you can get it fixed, have you tried going to a yamaha dealer yourself to get the gaskets? I found they can get most things I need. Check out Peza's mechanic, sounds like a good guy.

 

Hi there,

Michael, from CHM, rang me today to say that the bike is ready. He took it for a good test today, and was happy with the result, but he wants to test it again on monday, fingers crossed I may pick it up on monday arvo. <!-- s --><img src="{SMILIES_PATH}/icon_smile.gif" alt="" title="Smile" /><!-- s -->

He said that this is the best it will ever be, unless I fit new carbys, and that this bikes do not like low revs at take off. If I try to take off in low revs I will always have problems.

Question: What RPM are at the best at take off, for this bikes?

I don't know... I have something about riding clatches on, can't be good for them, wether they are dry or wet, like on a bike.

Will see, let you know when I can ride it again.

 

Thats good news.

As for riding and or starting technique, you will get to learn the quirkiness of the bike with time.

What I had the most trouble with was traffic where you couldn't use idle speed to creep forward. To combat this you would give it a blip and move on that but if you didn't give it enough it would stall, and if you gave it too much, it would fuel up and get temperamental.

Thats my experience FWIW.