1984 Kawasaki GPz750 Runs Like Crap. Let's Fix It! Part 1
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- Опубліковано 5 лют 2025
- Getting a GPz back into good running order. I go over the bike, explain my history with this particular bike, why it's green and not red; then, after pulling the carb rack, I go into what is the cause and some general carburetor wisdom about repair and restoration.
I mention a link in the video to one of the best explanations of fuel level in float bowls I have seen, so here is that link. Thunderhead289 is the creator. • 70 MPH?! Lawn Mower Ca...
Thanks for watching!
Mate one of the best videos I have seen on how to! I look forward to more, hopefully one day you do a GPZ1100 B2.
I had a silver ‘84. Jeez, getting the carbs off and on was a bear with the rubber spigots in place. Wish I’d known then what you did. Great bike. K&N, jet kit and Supertrapp 4-1. Ran it 50,000 miles. The reviews at the time called it the most European handling UJM sport bike. I sold it to buy my first Guzzi, a LeMans 1000 that I still have. Wouldn’t mind another GPz.
🤩🇺🇸👍⚖️👁️👁️⚖️ Have 84 (silver) in mothballs since 94. Rode Long Island to Pasagoula in 84. Will be restoring next year. Retirement trophy project. Flame spitting ported animal! Have 33 mm Kehein CR Specials/4 into1 Vance & Hines. Will be installing Wiseco 810 kit! Great video! All the best!
Waaay back in the day I had a GPz 750 A2. It was impossible for me to ride it slowly. I had to sell it because I knew I wouldn’t survive much longer. My ex wife refused to get on a bike with me ever again after one spirited outing 😂😂. Loving your videos
Thanks.
Great video. I have an 83 its my 3rd. classic ride. love the simplicity of an air cooled bike. Get them set up , maintain and drain the carbs when it sits for extended periods. I have an 82 900f super sport more torque and less revy. Great bike but seems way heavier the the gpz. keep up the good work. 👍
I’ve got a gpz 500 18k miles perfection ❤
I bought mine in Germany and it was black and red. Had it close to 140 mph on the Autobahn and the front end started to lift a bit. Scared me and never went that fast again. Brought it back to the States and later sold it. Have a Honda Goldwing now. Kind of wish I still kept the Kawasaki though.
I took my '83 Yamaha Seca 900 up to 130 way back in probably 1984 on a long straight stretch of interstate, the front end on that got light also. Scary.
Hello, like your video, when removing carbs, I remove air filter, then heat inside airbox whith heat gun, the carb to airbox rubbers get soft, and I then push rubber boots into airbox, replace in reverse.
Good practice. Yes, these are soft, not heating necessary. But I do exactly as you described. #3 is a particular pain in the @ss because of the crankcase vent tube location inside the box and cannot get the grommet part of that grommet of the air inlets to engage without a great deal of naught words. Thanks for watching.
Can’t believe how mint this example is how many miles on it. ? One was entered in a 6 hour endurance race here in NZ it expired in s few laps busted rod😳hate having a busted rod! I rode one and did some impressive donuts to impress the Sheila’s Got a gloss on it that nite nice work luv the paint
8581 miles. I didn’t do the paint but thanks. Customer had that done. Cheers.
I put Eddie Lawson green machine Head on a z1-r turbo sleeved to 1425. Is is mark 2 welded crank, falicon slotted sprockets +3-3 degreed underlap to megacycle X15 cams, shim under buckets, Simpson gears.
Way past my pay grade. I appreciate the info. I believe Falicon is out of business. I had them do a crank on a small bike years ago and they were in the midst of what ended up being the end of the line.
Hi love your video on pulling apart the carbies and cleaning them. I am about to do mine as they are full of dry bad fuel. When i pulled the throttle valve and diaphragm apart i noticed the curved bit on the bottom were all facing different ways. In my service manual there is no reference as which way they should face. They have two holes in the bottom,one for the jet needle and another. Is there a certain that second hole should face, example to front of carby? The carby is a Mikuni one with a US jet needle. I am Australia so any help would be greatly appreciated.Thankyou
Common finding. On the rubber diaphrams themselves, there is a small radius protrusion that sticks out and that lines up to a spot on the top of the carb body where the diaphram seals underneath the cover. It's kind of like the shape of the end of your thumbnail. That radius "clocks" the slide so it's installed correctly. Now, if you don't have that small radius spot that sticks out on the diaphram, the likely scenario is that someone replaced the diaphgram rubber with aftermarket which don't have that feature. In that case, just make sure the curved bit (which is called the slide cutaway) is facing towards the air box or air filters. Not facing towards the engine side. So, facing outwards/backwards. I don't remember the relationship of that second hole to the cutaway, so as long as the cutaway is facing backwards towards the intake, that's the way the go.
Additional... I took a look at the video and a picture of the slide on the CMSNL website, that slide doesn't have a cutaway that only exists on one side of the bottom of the slide, it's like a tunnel cutaway. So what I wrote below is not helpful. Hopefully you have that tang on the slide diaphragm that I described, which lines up with that spot on the carb body. If not, I don't remember which way the second hole faces, I just don't remember. If you do a search online forums and such you probably can find it. Hope that helps clarify. I did this video a long time ago, so that bike is all but a distant memory.
Thankyou for your reply. I actually re watched the video again and paid attention to when you were handling it. I saw the little tang and mine doesn't have that but i did notice it were it was in relation to the holes in the bottom.So hopefully from that I can work out which it sits. @@MotoRestoFL
日本国内仕様のgpz750 a1に乗っています。
海外仕様のキャブレターは86psにと記載があり、中古の海外仕様のキャブレターを入手しました。
サービスマニュアルが無くパイロットジェットの戻し量が分からないので、教えて下さい。
You’re both funny and knowledgeable. Which makes for an entertaining video! I’m thinking about getting one of these in my area. It needs a fair bit of work. How’s the parts availability for this bike?
Some things are almost unobtanium, many others are easily obtained. It really depends on which part or parts you’re needing.
@@MotoRestoFL thanks for the reply! I’m used to working on obscure Italian cars from the 70’s so I get it. What’s been the most annoying thing to find in your experience?
@@BiggCliph 1982 GPz 750 front fork bushings. The upper (guide) bushing I think it was are broken out as a searchable part, but the lowers on the fork piston tube itself are not. After a lot of research and some educated guessing, I figured out that that all bushings and the oil seal are exactly the same as a 90’s Kawasaki KLR250 front forks. The only difference was the dust seal/cover which was orderable separately.
@@MotoRestoFL thanks for the info!
Great video. Lots of info. Thank you.
I have an 84 GPZ 1100a2. Bought it in Germany and was wondering what aftermarket rear shock will fit this bike? Plenty of used ones on ebay but would like a new one.
I don’t know. You’d be wise to go on GPZ forums and social media sites and ask. Or contact various shock manufacturers such as Hagan or suspension companies like Traxion Dynamics in Georgia USA. Sorry.
I have an 1981 gpz 1100 I’m having problems with it not starting problems. I was told by my mechanic that it’s an electrical problem and it’s just too old to find parts. It’s starts but will turn off randomly. It turns over, has spark, and a new fuel pump. Any help is greatly appreciated.
Unfortunately, I cannot add anything further than what your mechanic said because it's fuel injected. I do not work on fuel injected machines generally speaking. I would try to repair one of those early fuel injected classics if I wasn't having to shut down my business side due to insurance issues here in Florida, but all I can suggest is get yourself a Kawasaki factory service manual and follow the various troubleshooting tables for the variety of problems it could be experiencing. If it has spark and cranks then it's fuel, period. If you installed an aftermarket fuel pump, I'd start there. Most of the aftermarket stuff is Chinese junk. You might want to reach out to Quantum Fuel Systems. I used one of their pumps on my VFR it it's a great product. Of course, the pump on that kind of machine versus yours is completely different, low vs higher pressure. Yea, wish I could help you more. Cheers.
Push and pull cable be worth watching
Tu devrais voir tout le système d’allumage et démonter les carburateurs et les nettoyer et refaire le calibrage des carbus
Je pense que la moto tournerait beaucoup mieux 😂😂😂
Correct. Done in the subsequent video.
thanks
I never want to see any of these bikes ever again.
Cleaning the carbs and fitting those fckn boots endless times,with that fuel system that sucks.
Even bike mechanics loathe that system.
I sold mine, running like crap again,carb issues.
They're designed to be quite easy but only within one or two days after the thing is assembled at the factory, then with every year, it gets harder by a factor of ten, I know what you're saying.
God i remember that bike
Nothing worse than a EPA Vacuum actuated fuel valve. When it goes bad and leaks fuel , you would not know this has happened unless you have an over flow and can see fuel on the ground. You are better off going with a old school gravity feed fuel valve and simply turning to the off position when done riding. Remember to plug the vacuum line.
No argument here.
@@MotoRestoFL I appreciate all your videos. I just picked up a 2002 1200s Bandit. Did the carbs and replaced the problematic Vacuum actuated fuel valve with just an old school gravity feed. Off, RES, ON. Best upgrade ever. Will do my Harley next.
too much talking, juibberish, and banter, and schtick. just get to the fixin!!!!
You spelled schtick correctly, congrats!