1990 F2 Wont Rev out past 6k

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JanBros
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Re: 1990 F2 Wont Rev out past 6k

#16 Post by JanBros » Sun Apr 16, 2017 6:34 am

Morty wrote:[youtube][/youtube]
Sitnlow4life wrote:
Morty wrote:Clean the system and get rid of the inline filter more trouble than they are worth
Why are they trouble ?
Because they restrict flow, there is already a screen on the petcock
not enough to cause problems
if it runs, you can race it !

oldracer
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Location: ontario, canada

Re: 1990 F2 Wont Rev out past 6k

#17 Post by oldracer » Sun Apr 16, 2017 9:34 am

I had this exact problem with my '84 RZ 350. It turned out to be that the previous owner had fitted a mis-matched flywheel and stator, check it out.
Dave.

Sitnlow4life
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Re: 1990 F2 Wont Rev out past 6k

#18 Post by Sitnlow4life » Sun Apr 16, 2017 1:26 pm

oldracer wrote:I had this exact problem with my '84 RZ 350. It turned out to be that the previous owner had fitted a mis-matched flywheel and stator, check it out.
Dave.
What will I look for when I pull the cover?

Yours worked fine one day then no good the next ?

Thanks Todd
1990 RZ350 with Toomey Pipes and Vforce Reeds

oldracer
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Re: 1990 F2 Wont Rev out past 6k

#19 Post by oldracer » Sun Apr 16, 2017 5:04 pm

Mine had a great spark at cranking speed, and started and ran fine up until about 6000 rpm, after that , nothing. It turned to be that the previous owner had fitted an '86 flywheel and an '84 stator.
I believe Martin K. has posted a really useful chart of what works with what.
This may not be your problem as mine never did run good, which would make me very suspicious of your stator or "black box"

oldracer
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Re: 1990 F2 Wont Rev out past 6k

#20 Post by oldracer » Sun Apr 16, 2017 5:10 pm

Also, make sure the power valves are opening as the revs go up, remove the covers and watch them as you increase the engine rpm. They should be fully open by around 6000 rpm.
Dave.

Sitnlow4life
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Re: 1990 F2 Wont Rev out past 6k

#21 Post by Sitnlow4life » Sun Apr 16, 2017 8:19 pm

Run it on the center stand with the power valve covers off ?

What should I look for ?
How can I see what position they are in ?

Thanks
Todd
1990 RZ350 with Toomey Pipes and Vforce Reeds

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two-stroke-brit
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Re: 1990 F2 Wont Rev out past 6k

#22 Post by two-stroke-brit » Sun Apr 16, 2017 9:46 pm

there was a vid posted on this site with a camera mounted to the frame showing the valves working as the bike was ridden.
https://www.youtube.com/watch?v=N_sv6vxzfMs" onclick="window.open(this.href);return false;

think this is it
350LC,Athena 392 big bore,stock porting,swiss cheese air box,stock reeds,spec11 pipes.(now TSA big bore pipes)
She might not be pretty but she will always be a fun ride


1982 YAMA RD350LC
98KDX 220R
1967 TRIUMPH TIGER
2001 TRIUMPH TT600

Sitnlow4life
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Re: 1990 F2 Wont Rev out past 6k

#23 Post by Sitnlow4life » Sun Apr 16, 2017 11:26 pm

Check out my album

It is moving with bike reving in neutral

https://goo.gl/photos/FTaZyv8X7bDR5az8A" onclick="window.open(this.href);return false;
1990 RZ350 with Toomey Pipes and Vforce Reeds

MK
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Re: 1990 F2 Wont Rev out past 6k

#24 Post by MK » Mon Apr 17, 2017 5:46 am

Well, as I was explicitely mentioned, I'll share my 0.02 $.
He said it was working before and this pretty much rules out a wrong combo of rotor/stator/CDI.

As already adviced it could be either fuel flow or electrical.
If you can rule out the first, it'd be time for cable works anyways.
Here it could be as simple as a faulty connection (source coils, pick-up, CDI) or a faulty component.
Now for my usual advice: Don't waste too much time with the original components. If you ruled out fuel/carbs, then go for a programmable DC CDI (Ignitech or Zeeltronic PDCI).
Why? Because it works with faulty source coils AND replaces the eventually faulty CDI - that's two candidates hit with one shot.
As if that wouldn't be enough, a changed ignition & PV curve adds about the same amount of performance (about 3-4 kW) as some medium pipes would do.
And that for a price that is not much higher than 30 year old, shady used parts.
Bye
Martin

Sitnlow4life
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Re: 1990 F2 Wont Rev out past 6k

#25 Post by Sitnlow4life » Mon Apr 17, 2017 11:12 am

The zeeltronics piece work right out of the box ?

Or does it require building an ignition map ?

I never heard of ignitech before do they offer a similar unit ?

Thanks for all the information
1990 RZ350 with Toomey Pipes and Vforce Reeds

MK
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Re: 1990 F2 Wont Rev out past 6k

#26 Post by MK » Mon Apr 17, 2017 11:19 am

Define "work".
If you just want the engine running somehow, then yes, they run out of the box as usually delivered with the stock curves.
If you refer to what I wrote in my last post, then you need to either use your own skills or pay someone to do the optimization. At the end it's not too complicated if you're willing to read a bit.

You get what you pay for. Your choice.
Bye
Martin

Sitnlow4life
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Re: 1990 F2 Wont Rev out past 6k

#27 Post by Sitnlow4life » Mon Apr 17, 2017 10:49 pm

When I had the plugs out I noticed they were absolutely soaked in gas ,this leads me to believe that the mixture is not being properly ignited.

I tested the coil and all measurements seem to be within spec as per the manual.

Primary coil 0.28-0.38 I measured 0.4
Secondary coil 4.72-7.08 I measured 5.91

I cleaned all the places the coil grounds at and checked all wiring connections , everything seems good..

I reinstalled the coil and cleaned the plugs out with ether then let them dry .

Fired bike up and went for a ride ...

For the first few blocks the bike was back to normal making power after 6k...

Then the problem resurfaced quickly , power dead after 6k , bike would just fall on its face.

I headed back home and this time it got even worse then before , bike would not rev out past 4k , bike was barely rideable at this point .

As I was limping it home ... i would leave the throttle on and you could feel the bike come on for a second and fall off the next second at the same constant throttle angle.

When i returned home the bike would barely idle, I took a video which is at the end of the attached album, you can see i try to rev it and it just dies.

https://goo.gl/photos/FTaZyv8X7bDR5az8A" onclick="window.open(this.href);return false;

I pulled the plugs and the left side plug was soaked again, but the right side was dry this time and had good coloring around the ceramic.

I am pretty sure this is an ignition problem at this point .

Either the Coil or the CDI box.

I looked up the coil for this bike and came up with 3LC-82310-01-00

That number cross references with 87-96 Banshee.

So I will try a known good banshee coil tomorrow and see if anything changes.

I guess if the problem goes away then it was the coil and if it continues , then it must be the CDI.

Any information here would be great ....

Thanks again
Todd
1990 RZ350 with Toomey Pipes and Vforce Reeds

Sitnlow4life
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Re: 1990 F2 Wont Rev out past 6k

#28 Post by Sitnlow4life » Mon Apr 17, 2017 10:51 pm

MK wrote:Define "work".
If you just want the engine running somehow, then yes, they run out of the box as usually delivered with the stock curves.
If you refer to what I wrote in my last post, then you need to either use your own skills or pay someone to do the optimization. At the end it's not too complicated if you're willing to read a bit.

You get what you pay for. Your choice.
Martin

Thank you for the information, I will most likely order the Zeeltronic unit as I have a idea that my CDI is no longer good.

Thank you again for your information
1990 RZ350 with Toomey Pipes and Vforce Reeds

MK
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Re: 1990 F2 Wont Rev out past 6k

#29 Post by MK » Tue Apr 18, 2017 6:04 am

You're welcome.
Check out http://rd350.gmxhome.de" onclick="window.open(this.href);return false; and look for the pipe building and the PV modification manual. They contain some guideline to setup the ignition and PV curves.

I doubt that it's the HT coil.
If at all it's usually the source coils (red, brown, green on the stator), the pickup (white green, white red), the wiring to the CDI (especially the black ground cables) or the CDI itself.
From what you described in the last post there's slight possibility for mismatched ignition parts.
If the spark has a small issue after 6k it could result in plug fouling and after that the issue becomes very obvious.
To be sure I'd once more change plugs either with brand new (try B9ES instead of BR which are more prone to fouling) or used ones that were running.
Bye
Martin

JackB
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Re: 1990 F2 Wont Rev out past 6k

#30 Post by JackB » Tue Apr 18, 2017 8:02 am

If you get the Zeeltronics unit you have to be sure to run the resistor plugsor caps or it will cause the unit to go goofy,at least mine did. After I installed the resistor plugs I had to reload the curve back in.
1984 Rz350, Wicked Toomey rep pipes, Dynojet kit,Zeel unit,Toomey Y boot filter.

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