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Author Topic: z400 issues  (Read 1037 times)

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z400 issues
« on: November 22, 2013, 06:30:05 pm »
hey guys I got my buddys z400 over here helpin him fix it, it had an issue with the engine spuddering n cutting out ONLY in 5th gear, I figured out it was the gear position sensor on the side of the engine. I by passed sensor and now it runs great on top. But it also starts hard( u have to nail throttle) and kinda surges when idling, when driving at low speeds it stalls out and is vary hard to keep running, u have to constantly be reving to keep alive, but it will idle some times?? carbs getting fuel, all the grounds appear ok, I have read that these have issues with the vacuum slides? was wonderin if anyones messed with these??
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Re: z400 issues
« Reply #1 on: November 22, 2013, 08:58:19 pm »
F'n 4 strokers!
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Re: z400 issues
« Reply #2 on: November 23, 2013, 06:47:17 am »
Hmm weird.. You may wanna see if the choke is off and the petcock is on pri.
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Re: z400 issues
« Reply #3 on: November 23, 2013, 11:16:59 am »
Yeah i tryed the pri fuel setting, are these known for choke problems? I see they sell manual pull chokes to replace the cable sett up
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Re: z400 issues
« Reply #4 on: November 23, 2013, 12:18:12 pm »
That's just to clean up the handle bars not much of an issue.
Im starting to think valves need adjusted and their known for that. Makes for hard starting. I would start with that.
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Re: z400 issues
« Reply #5 on: November 23, 2013, 03:47:51 pm »
Tight valves. I think the z400s are known for cupping intake valves if they are not adj and checked frequently.
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Re: z400 issues
« Reply #6 on: November 23, 2013, 07:57:02 pm »
Quote from: LT500Kid on November 22, 2013, 08:58:19 pm
F'n 4 strokers!
at least the cylinders dont crack  -->
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Re: z400 issues
« Reply #7 on: November 23, 2013, 08:39:27 pm »
i would deff pull the slide out and make sure its not all scratched up and maybe hanging up in the carb. while its out, polish it up a lil bit and inspect the needle . then go after the valves.
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Re: z400 issues
« Reply #8 on: November 23, 2013, 09:00:40 pm »
Quote from: LT500Kid on November 22, 2013, 08:58:19 pm
F'n 4 strokers!

Yeah the damn things weight to much also

 -->.  :))
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Re: z400 issues
« Reply #9 on: November 24, 2013, 01:56:55 pm »
Got it fixed guys, ended up being vacuum slide sticking, i cleaned it up now she runs good +k2
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Re: z400 issues
« Reply #10 on: November 24, 2013, 06:36:35 pm »
Need any parts for it I have a few things laying around?
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Re: z400 issues
« Reply #11 on: November 25, 2013, 03:34:55 pm »
No thanks man, my buddys cheaper then dirt, I couldnt get him to even but a new spark plug for it once i found out the problem lol
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Re: z400 issues
« Reply #12 on: November 25, 2013, 10:26:12 pm »
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