Question about kawasaki Z750 Motorcycles

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Extremely hard to start

Had the carbs checked,ok
new plugs
seems to foul plugs during operation

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Maybie you need to give the valvs more clearence

Posted on Feb 16, 2009

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This could be one of many rich gas oil mix...also it could be you need to increse your air intake.and..your fuel jets may need cleaned! hope this is of help!

Posted on Dec 10, 2008


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1 Answer

Gpx 750 carb

It sounds like you are an experienced mechanic, but sometimes the most obvious problem is something else. Sometimes the plugs will foul out, and it seems like a fuel issue. Why don't you check your plugs. My plugs fouled out at 4,000 miles. I was still under warranty so I didn't work on it myself, but to me it seemed like fuel. A new set of plugs fixed everything.

Nov 03, 2013 | Motorcycles

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Starts ok, although seems to be missing slightly, sluggish throttle response and wont rev beyond 4 thou ,

Check plugs, may be fouled> When storing bikes in my old mans garage, the plugs always foul

Mar 29, 2013 | 1995 kawasaki GPZ 1100

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Bike sat up for 3 or 4 years. recently cleaned the carb, changed the plug and oil and bike started. Tried starting it recently and it wont. Seem to be backfiring sometimes when kicking it over.

clean plug .. although new plug if old fuel or unbalanced carb it may quickly foul. if this works you may need help to work out whats causing plug to foul.

Mar 10, 2013 | 2001 Yamaha YZ 426 F

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Engine hard to start gets hot and no power checked carbs their ok

fouled spark plugs...intake manifold leak... you could have a vacuum line come off or isnt on all the way. bad batch of gas..weak coils, or poor compression. or the choke could not be operating properly. also running too heavy an oil could cause this problem, you should run 10w40 only.

Oct 05, 2009 | 1989 Suzuki GSX 550 EF

2 Answers

Yz450f that quit running

Yes, it does have an automatic decompression mechanism. It is a centrifugally operated mechanism and it is EXTREMELY unlikely that is causing your problems.
The two highest probabilities are:
1. Fouled spark plug. Forget what it looks like, put a BRAND NEW plug in. It is the cheapest form of diagnosis you can do. These bikes are terrible about fouling spark plugs and a fouled plug produces the exact symptoms you described.
2. Inspect your valve clearance. Tight valves will also make the bike hard/impossible to start with the kick starter. In some cases, it can be push started, but still won't kick. With tight valves, the bike, although hard starting, will run pretty good, for awhile. Eventually it will burn the valves and quit running though.
If your bike isn't kick starting fairly easily, something is wrong and needs to be addressed. The only other issue is making sure the idle speed is set per the service manual. These bikes have a fairly high idle, some as high as 1700 rpms. If it is set too low, it makes them hard to start too.

Sep 11, 2009 | 2004 Yamaha YZ 450 F

1 Answer

Homelite trimmer zr40502

Do you have fresh gas? If so is the mix right? If you can get to the carb easy spray some carb and choke cleaner in it. Check the gap on the new spark plug. The gap should be located somewhere in the manual. The big problem is making sure that the mix is right. To much oil in gas will foul plug smoke like crazy and foul the plug and hard to start. Not enough oil and you can seize it up.

Good luck let me know if this helps.


Aug 16, 2009 | Homelite ZR40502 Factory-Reconditioned...

1 Answer

Hard to start then won't stay running

All of these "starting/running" issues are similar and related directly to one cause. It was suggested several times that the muffler may be plugged, but mine was found clean during a complete teardown. Cab cannot be blamed either, since the fuel filter wouldn't be able to pass anything large enough to foul an orfice.
Very common issue with hot running two cycle engines...ring fouling and loss of compression. The brand or type of oil must be scrutinized, and the mixture kept exact. I would never use anything but Echo or manufacturers recommended oil in these units ever again.

Jul 28, 2009 | Troy Bilt Tb320bv Spring Assist Blower/Vac

1 Answer

Bike won't start 92 yamaha fzr 600

Sounds like the plugs are fouled out, I would pull them and make sure they're about the color of a paper bag. If they're all sooty and wet you most likely have a rich condition. I would take the carbs out and clean everything and pop in a new set of plugs. I have a 87 Fz600 that was acting up until I cleaned the carbs.

Apr 20, 2009 | 1994 Yamaha FZR 600

2 Answers

My FZR600 won't start. No mods, all stock. I got it a month ago and it had been stored over the winter with no stabilizer. It wouldn't run, so I cleaned out the tank, made sure the fuel lines were clear,...

These things are really temperamental.The plugs are fouled again..I had the same bike and went through the same thing..It doesnt take much to foul them..Get some new plugs and she'll run like a beaut..Just remember not to choke it to much..Thats where the plug fouling happens the most..Always keep a spare with you and you'l always be on the good..It will work!!Have a great night!!!!!!!!

Apr 03, 2009 | 1989 Yamaha FZR 600

1 Answer

Spark plug fouling when cold starting

sounds like the carb wants cleaning and re-balancing

Jan 24, 2009 | 1996 Yamaha SZR 660

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