Problem with FZR fuel pump maby?

METOO · Jun 1, 2010

last time i pulled fouled plugs out of a bike i just cleaned it with a high grade sand paper and put it back in then went for a good ride, was all good after that. dunno what caused it though

dontz125 · Jun 1, 2010

Fouled plugs is too much fuel (or not enough air = dirty air filter) or weak spark.

dave · Jun 1, 2010

There have been previous reports of fouling from using SHELL OPTIMAX fuel (now called V-POWER).
From the shell website <a class="postlink" href="http://www.shell.com.au/home/content/aus/products_services/on_the_road/fuels/shell_vpower/overview/">http://www.shell.com.au/home/content/au ... /overview/</a> and click on "IS IT RIGHT FOR MY BIKE"

Compatibility

Although Shell V-Power is compatible with most bikes there may be a requirement to make slight adjustments to the engine such as changing spark plugs, and reducing the size of carburettor jets, or a combination of both.

Bikes used mainly for city running (and therefore subject to considerable stop-start running) are likely to need such adjustments when changed to Shell V-Power.

Some fine adjustments may also be required to ensure when the bike is hot it runs smoother and with better overall performance and in particular there is more power at the top end.

Bikes that run well on Shell V-Power without any of these changes are usually fitted with fuel injection and advanced fuelling systems. Shell recommends that all bike and parts modifications suggested on this website are made in consultation with your bike’s manufacturer.

Compression

Bikes with high compression engines shouldn’t be more prone to misfiring than bikes with lower compression engines. However, this problem may be caused by the way the petrol is stored in a bike (i.e. incorrect storage can reduce fuel volatility and cause hesitation and stumble until the engine is warmed up).

The problem may also be affected by the type of running the bike is used for (round town stop/start low speed operation can result in rich running and plug fouling).

Knocking (Detonation, Pinging)

The correct technical term for this phenomenon is ‘knocking’, which happens when an engine:

a) Runs on fuel with an octane number that is too low, for the engine.

b) Runs too lean (air-fuel mixture is incorrect).

c) Has incorrect ignition timing.

The effects of (a) and (b) shouldn’t occur using Shell V-Power because it has a high octane number (98) and as a result of the high density of Shell V-Power, it tends to enrich the air-fuel mixture.

The ignition timing (c) should be checked and adjusted to comply with the engine manufacturer's specifications.

Shell recommends that all bike and parts modifications suggested on this website are made in consultation with your bike’s manufacturer.
Click to expand...

JeremyHill · Jun 2, 2010

Thanks a bunch guys, I'm gonna give them a clean and see if she will start, my dad wants me to take it to the mechanic but i'm not really keen to do that yet...And for the reason for fouling maybe what METOO said will come true for me to, One time i read a post that if you don't change gear around 10000-14000 revs it can cause "Carbon" fouling so maybe i'm changing to soon?

dave · Jun 2, 2010

Really, the bottom line is that fouled plugs is the fuel mix is too rich, particularly when riding around town at lower throttle openings. The plugs just don't get quite hot enough to burn the crap off. You can run hotter plugs but that does not address the real issue.

The cause of the richness is probably leaking or worn float bowl valves. If leaking, remove and replace, or try and make them reseat. If the seats have worn, adjust the floats so that they close off at a lower level.
There are posts on the site about how to do this.

There is also a possibility that there are other parts worn in the carbs, but I would look at the floats first.

JeremyHill · Jun 3, 2010

Thanks Dave <img src="{SMILIES_PATH}/icon_biggrin.gif" alt="" title="Very Happy" />
I took off the plugs and the ones that were in there were (NGK CR9E's) wich is a colder plug, I'm wondering if it would make much of a difference if I put the original one's (NGK CR8E) in so maybe the hotter one would fix it, considering it was made to run that heat, or is it not enough to do anythink.

METOO · Jun 3, 2010

spending 20 bucks on some plugs is alot cheaper than getting a mechanic to look at it, worth a shot at least..

FZRSHREDDER · Jun 3, 2010

I'm fairly sure FZR 250 is suppossed to run CR8E. So put a set of thoose bad boys in and see if theres a difference.

JeremyHill · Jun 4, 2010

Hey guys, so far so good <img src="{SMILIES_PATH}/icon_biggrin.gif" alt="" title="Very Happy" /> i changed the plugs for some CR8E's and my dad's a previous mechanic and now works at a parts and help type shop, so he got me a half price deal on the plugs through the supplier <img src="{SMILIES_PATH}/icon_biggrin.gif" alt="" title="Very Happy" /> and now my bike (well so far) goes really good , i just hope that running a hotter plug it wont foul up again thanks for all the help guys.

Cheers to everyone. Best bike and website ever...period.

JeremyHill · Jun 4, 2010

Mostly i just wanted to atleast start her and hear the engine again, I'm pretty happy, brought it up to 100kmh on a quite road lol <img src="{SMILIES_PATH}/th_Biker_1.gif" alt=":Biker1:" title="biker_1" />

JeremyHill · Jun 5, 2010

still going good, takes a long time to warm up though.

METOO · Jun 5, 2010

great to hear, but out of curiosity what is 'a long time' and to go from what point on the temp to what you would call warm?

JeremyHill · Jun 6, 2010

Thanks, and well the temp gouge goes right from the bottom to about just above the 2lines (about a centimetre from the bottom) and that still isn't operating temperature but i let it warm up for like 5min's go easy on it for another 5 or 10 then I hoon it.

dave · Jun 7, 2010

Ok on getting the right plugs. I paid $4 each (4 years ago) for mine. Bike shop wanted heaps more. I think i got mine at Bursons.

METOO · Jun 7, 2010

the warm up time seems about right.. same as mine. but i usually start riding gently just above the break in the temp guage (less than 6000) until the about 5 mins it takes to warm up. i wouldn't be too worried if it takes 5 mins to warm up properly (with choke)

JeremyHill · Jun 8, 2010

Ok, thanks guys, and btw i don't even use the choke.

I just fire it up with a little bit of throttle goes first turn.

<img src="{SMILIES_PATH}/icon_cool.gif" alt="" title="Cool" />

CornersFTW · Jun 8, 2010

Plugs seemed to be your main issue. I would still recomend changing your filters, air and fuel. Just to be on the safe side, also it may pay to next time you run low on fuel to remove the tank completely, drain it and give it a flush. There is bound to be crap in it. Make sure you have fresh clean fuel to get you to a servo tho. No point putting dirty fuel back into a clean tank. Should take maybe an hour tops, but will give you piece of mind. If it happens again consider removing carbies and cleaning all the jets, especially if it sat around for a while before you bought it. Glad to hear its running well.

Nato

JeremyHill · Feb 4, 2011

Hey guy's, thought i'd give you an update...

My bike runs perfect now, it's been a long time coming but it turned out to be a mix of alot of little problems.

1- New battery, the old one couldn't hold it's charge and was making the regulator work harder then it needed to, there for the bike ran like crap because of weak ignition. But after the new battery ran better again... but i couldnt get passed 12,000 RPM.

2- I found out that the EXUP cables were around the wrong way (believe it or not i was actualy happy, this explains alot of the symptoms i've been having) the previous owner must of done it when he replaced the exhaust with an aftermarket DIC one.(also the reason he would have sold it, because it was running badly, i got a bargen.) Since this was my first 250 four Cylinder bike i didn't know what to expect so i did not know that the cable was around the wrong way untill i went for a ride and found it couldn't get passed 12,000 rpm which made me finaly have a look at the EXUP.

3- Carbs got balanced cleaned they wern't to bad, this was before the EXUP problem it improved the bike alot but, still had problems oviously becuase of EXUP.

4- New Fork seals they were leaking..

Hmmm thats all i can remember but it's so great to have it run like it's supposed to, a whole new take on FZR's now i almost went and traded it in for a GN250 or somethink just for the heck of reliability. But now i wouldn't trade it for the world i love it.

Thanks for all the help guys, i got it all form here.

dave · Feb 4, 2011

Most likely running rich, or using the wrong plugs.

dontz125 · Feb 5, 2011

?

My bike runs perfect now
Click to expand...

<img src="{SMILIES_PATH}/icon_all_coholic.gif" alt=":alcoholic:" title="Alcoholic" /> <img src="{SMILIES_PATH}/icon_roll.gif" alt=":roll:" title="Rolling LoL" />

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