Date: 24-08-17  Time: 02:03 AM

Author Topic: Problems at high speeds.  (Read 2931 times)

mr self destruct

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Re: Problems at high speeds.
« Reply #75 on: 09 August 2017, 10:13:49 PM »
Good point! Carbs are off so I'll look at the float valves tomorrow.
So those small holes, do they lead to the float chamber to allow ventilation to it or something?
If I didn't know better I'd say they were accelerator pump jets, but they're facing the wrong way for that surely?
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Disorderlypunk

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Re: Problems at high speeds.
« Reply #76 on: 09 August 2017, 10:29:25 PM »
ok got confused untill i read previous posts
basicly they let air in while your throttle is closed (pilot)(sorry if im writing this in basic terms but its easier for newbies in the future)
so if your float needle valve is open and letting in fuel your main jets are effectively closed so this is the easiest route for your fuel to flow through
- 90% sure its a jammed float needle problem
could just be a bit of crap made its way through if not its a new needle valve assembly 5-10 quid on ebay but make sure you replace the whole bit and not with (ooh there was a bit of that in a spares box)
hope its making sense i am better at doing than explaining (which is why i fail written exams lol)
« Last Edit: 10 August 2017, 12:02:19 AM by Disorderlypunk »
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Freza

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Re: Problems at high speeds.
« Reply #77 on: 09 August 2017, 11:34:16 PM »
Sorry for stealing your thread, but since we're talking about similar problems here, could I ask what could cause this issue on mine: every time after finishing a ride, if it's passed more than 15min, when I turn to ignition, the pump starts working but shouldn't. You can hear it clicking several times. Then the engine starts (with difficulty) and when it starts you can smell the gasoline.

My mechanic serviced the carburetor recently and changed some rubber seals, for which he suspected could be causing the trouble. For a few days the bike was starting normally and pump wouldn't click after a ride, but now it started clicking again and starts with a difficulty again :(
What could be causing this ?

Disorderlypunk

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Re: Problems at high speeds.
« Reply #78 on: 10 August 2017, 12:00:51 AM »
ok freza - can you start this in a new thread i have a few possibilities for you.
just go onto http://foc-u.co.uk/index.php/board,15.0.html
and click new topic (dont want things to get too mixed up)
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Freza

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Re: Problems at high speeds.
« Reply #79 on: 10 August 2017, 11:56:09 AM »
ok freza - can you start this in a new thread i have a few possibilities for you.
just go onto http://foc-u.co.uk/index.php/board,15.0.html
and click new topic (dont want things to get too mixed up)


Did. Please delete my post. Thanks!

mr self destruct

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Re: Problems at high speeds.
« Reply #80 on: 10 August 2017, 12:21:46 PM »
Can anyone recommend a company to rebuild my carbs?


A quick internet search revealed JRS but is there anyone else that you guys think highly of?
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BBROWN1664

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Re: Problems at high speeds.
« Reply #81 on: 10 August 2017, 05:36:41 PM »
Any local bike shop will do it.
Another ex-Fazer rider that is a foccer again

mr self destruct

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Re: Problems at high speeds.
« Reply #82 on: 13 August 2017, 12:39:35 AM »
ok got confused untill i read previous posts
basicly they let air in while your throttle is closed (pilot)(sorry if im writing this in basic terms but its easier for newbies in the future)
so if your float needle valve is open and letting in fuel your main jets are effectively closed so this is the easiest route for your fuel to flow through
- 90% sure its a jammed float needle problem
could just be a bit of crap made its way through if not its a new needle valve assembly 5-10 quid on ebay but make sure you replace the whole bit and not with (ooh there was a bit of that in a spares box)
hope its making sense i am better at doing than explaining (which is why i fail written exams lol)


I took the bottom off one of the carbs tonight and I think I see what you mean.








If the float valve doesn't seal then the fuel will be forced up the left most jet of the theee in the picture, spilling out of the left hole in the first pic. I think. So I'll order four of those valve kits and see what happens.





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darrsi

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Re: Problems at high speeds.
« Reply #83 on: 13 August 2017, 11:03:15 AM »
Can anyone recommend a company to rebuild my carbs?


A quick internet search revealed JRS but is there anyone else that you guys think highly of?



This is where you really want to take your bike for the best results. Just remember you get what you pay for.


http://projexdyno.co.uk/index.php
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mr self destruct

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Re: Problems at high speeds.
« Reply #84 on: 16 August 2017, 03:08:54 PM »
I took the float valves out and looks like the O-rings have seen better days.


So I've ordered a repair kit which seems easy enough to fit. My next question is, does the float height need setting as a matter of course or is it pretty much ok as standard?


In the above pic according to the Haynes manual, the float height needs to be set by bending the tab that the needle sits on. But surely if that's flat it's at the factory setting already?
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Disorderlypunk

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Re: Problems at high speeds.
« Reply #85 on: 16 August 2017, 07:18:20 PM »
as you have the carbs out it is easy enough to hook a piece of pipe and see where things level out
check the manual on the height of fuel though as it changed part way through the manufacturing for some reason
y2k is 3mm above machined surface but i run mine at 4mm as im running the pods it seems the best performance and got rid of the 7k rpm stumble
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mr self destruct

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Re: Problems at high speeds.
« Reply #86 on: 16 August 2017, 11:37:17 PM »
Good point, I'll have a crack at it when the repair kits arrive.
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Re: Problems at high speeds.
« Reply #87 on: 19 August 2017, 10:49:26 PM »
Repair kits are here and look straightforward to fit, apart from one little ring. There are three o-rings, the largest of which I assume fits on the brass insert for the float valve, the middle sized one I think goes on the main jet, but what about the smallest one?



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unfazed

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Re: Problems at high speeds.
« Reply #88 on: 19 August 2017, 11:33:52 PM »
The pilot adjuster screw  :thumbup

mr self destruct

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Re: Problems at high speeds.
« Reply #89 on: 20 August 2017, 10:17:14 AM »
Nice one cheers!
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