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vort28



Joined: 22 Mar 2010
Posts: 1896
Location: Northwest , UK

PostPosted: Thu May 25, 2017 12:16 pm    Post subject: Reply with quote

Roads in UK not that great , and the 1990's sport suspension setting was HARD , not the best match.

Good to hear the YB made it OK.
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laminator



Joined: 27 Oct 2007
Posts: 315
Location: Midlands

PostPosted: Thu May 25, 2017 3:18 pm    Post subject: Reply with quote

I think I've got the rear seat that came with mine. I'll have a look tonight to see if I can find it.
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Bimotas, Yamaha FZR 2TK, Honda NC30, MV Agusta F3 800, Aprilia RS250
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Fulvia-hf



Joined: 27 Mar 2017
Posts: 14
Location: Netherlands

PostPosted: Sun May 28, 2017 6:18 pm    Post subject: Reply with quote

I decided to skip the option of ever carying a pilion so no need to invest in a seat. However thank you for the offer.
I made a very nice heel cover for the rear brake master from a small piece of T6 Aero aluminum. If you don't know it was home made you would think it was factory;-)
In two weeks I have an appointment with a FCR dyno specialist. see if he can fix the low end fueling. I wil have to sort out my misbehaving temp indicator. it is never steady but above say 9000rpm it starts to pick up the tacho pulses and will go to the red zone. I think a probably wire needs shielding. The speedo is under indicating. When compairing with a garmin it shows about 5% less. I only know about speedo's indicating the other way around. Over reading, making you think your bike is faster than it realy is. Now my bike speedo is making me believe it is slower than it is.
Never a dull moment with a Bimota!
Cheers,
William
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Fulvia-hf



Joined: 27 Mar 2017
Posts: 14
Location: Netherlands

PostPosted: Sat Sep 09, 2017 2:13 pm    Post subject: Reply with quote

Hi guys, I'm back with another question.
The CR flatsides aren't really the bees knees on the street. Heavy fuel consumption, little low down torque and a heavy throttle. But worse, very easy wetting of the plugs. I found Brisk racing plugs installed after the first time it wouldn't fire and changed them out for cheap copper core NGK's. It wets even quicker now.
I'm thinking of fitting stock YZF600 carbs. Maybe not as cool as flatsides and I will miss the chatter of the slides but for city riding probably the smartest solution.
However the stock CV's have a TPS. Will the SRi TPS connector fit and would it work?
Cheers,
William
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Fulvia-hf



Joined: 27 Mar 2017
Posts: 14
Location: Netherlands

PostPosted: Sun Dec 10, 2017 9:52 am    Post subject: Reply with quote

It has been a while but in the mean time I managed to find out using the parts cataloque that both the SRi and the SR use a TPS. The sensor is obviousely different as the SR uses Keihins and the SRI an italian system.
Does anyone know if I can just hook on the Keihin TPS to the SRi loom? That is without running the risk that I kill the CDI.

Cheers,
William
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Evilchicken0



Joined: 12 May 2010
Posts: 2798
Location: London

PostPosted: Mon Dec 11, 2017 7:50 pm    Post subject: Reply with quote

TPS was run on the ThunderCat carbs but the 4JH Foxeye (in Europe) didn't use a TPS.
Originally the YB9 SRi had injection on a Thundercat engine ... soooo because you have a ThunderCat engine (it should have 4TV on it) why not consider a Loom and CDI from a ThunderCat ???
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Fulvia-hf



Joined: 27 Mar 2017
Posts: 14
Location: Netherlands

PostPosted: Sat Dec 16, 2017 7:40 am    Post subject: Reply with quote

This is obviously an option when the first plan does not turn out to be a good one.
I have to pay 50euros for a set of 36mm Keihin Thundercat carbs with a TPS and might just try it on a rolling road with and without the SRI TPS connected. If the power curve is disappointing or the CDI blows I will have to take the route of installing a Thundercat loom and CDI. Although I doubt it if it is a straight swap. Bimota will for sure have modified the Yamaha loom to fit the smaller bike and have it mate up with CEV switchgear and lights.
Cheers,
William
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Fulvia-hf



Joined: 27 Mar 2017
Posts: 14
Location: Netherlands

PostPosted: Sun Jul 01, 2018 7:51 pm    Post subject: Reply with quote

It has been some time since my last update but many things happened preventing me from fixing the YB. Intill two weeks ago.
After my last post I have removed the stubborn Keihin CR flatside carbs and attempted to fit stock Thundercat Keihin 36mm carburators. The carburators fitted almost straight away but the choke and throttle cables had to be modified to fit. The EFI throttle bodies and the CR racing carbs use a single throttle cable while the Yamaha carbs have a double cable assisting in not only opening but also in closing the butterfly valves. I was able to fit the throttle handle and cable from the Thundercat but not without having to shorten both cables with about 4". I used a first generation Honda Fireblade choke pull-knob and fitted this to a custom bracket close to the nr#1 cilinder.
Having everything hooked up it started straight away but died after 10 seconds never to fire again. It looked like the plugs were wet but letting the bike 'dry-out' for 24h didn't help.
About at the same time I was fighting with this I stumbled across an advert on Dutch Bay for an YB9 fuelrail and filterbox for sale. I had bought my bike with CR flatsides fitted and the original injection parts were no longer with the bike. As this YB9Sri is a rare bike I'm almost certain this set now for sale belongs to my YB so I bought it. Yesterday I fitted the fuel rail and it fired up only to die again after a few seconds. When applying the starter with the butterflies full open I saw 4 different spray patterns coming from the injectors.
I guessed they must be gummed up from being removed from a running bike and laid on the shelf for over a decade. Using a very good youtube film on how to clean them I was able to restore all injectors to the same condition.
Today the bike fired up died after 10 seconds and a plug #1 pull showed wetness. I changed all uridium core racing plugs for OEM type NGK's and the bike ran for about a minute before I discovered n#1 cilinder wasn't participating. Plug wet...
I cleaned the plug, let the bike dry out for 5 hours and fired it up watching it die again after 20 seconds not wanting to restart. Now I'm sure the problem causing a stall and a failing restart is wet plugs. Either due to a rich mixture (but two sets of carburators and the EFI all rich?) or weak ignition.

My questions for the forum are these:

Is the Sri or the Thundercat sensitive to wetting?

Can the performance of the OEM yamaha coils deteriorate after 40000KM's promoting wetting by producing a weak spark?

Anyone know were the idle adjustment knob on the SRI should go?

Hope someone can help me to get this bike back on the road!.

Cheers,

William
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Fulvia-hf



Joined: 27 Mar 2017
Posts: 14
Location: Netherlands

PostPosted: Mon Jul 02, 2018 7:52 pm    Post subject: Reply with quote

I performed some more trouble shooting today. I decided the spark was weak and focused on the coils. My SB2 project had brand new coils fitted and they could serve as a temporary replacement for testing purposes. I hooked them up, pressed the starter and...Same result. Slightly brighter spark (can be wishful thinking;-) but no start...
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phil-short



Joined: 30 Jul 2012
Posts: 140
Location: Dublin,Ireland

PostPosted: Mon Jul 02, 2018 9:04 pm    Post subject: Reply with quote

I had a fair bit of trouble with mine fouling when I got it first but my mate stripped the efi and rebuilt it changing the potentiometer setting to run a bit weaker and it made all the difference. Still a bit wary about prolonged high speed riding being aware I am on the lean side but I've done a few trackdays without seizing it so it seems a viable mod. I still have a good spark so coils are okay with mileage and age. I am sticking with 8s as the plugs cos I don't want to run too hot.
I will ask my mate mechanic if he has any advice to give that might help, I should see him this week.
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Fulvia-hf



Joined: 27 Mar 2017
Posts: 14
Location: Netherlands

PostPosted: Mon Jul 02, 2018 9:30 pm    Post subject: Reply with quote

I have measured the TPS and found about 1.9Kohm with closed throttles and 4.04Kohm fully open. The TPS can be rotated a bit and that generated 1.3Kohm fully closed and the same 4.04 fully open. I guess the later position is more lean?
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Bud977



Joined: 03 Mar 2013
Posts: 368
Location: Sydney

PostPosted: Mon Jul 02, 2018 9:36 pm    Post subject: Reply with quote

Does this model have the fuel reserve float switch like the YB8? On that bike, low fuel sends a signal to the CDI to cut cylinder no.1 until you press the 'acknowledge' button. Could this be the same?
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who



Joined: 10 Nov 2010
Posts: 346
Location: Melbourne Australia

PostPosted: Tue Jul 03, 2018 4:37 am    Post subject: Reply with quote

Bud977 wrote:
Does this model have the fuel reserve float switch like the YB8? On that bike, low fuel sends a signal to the CDI to cut cylinder no.1 until you press the 'acknowledge' button. Could this be the same?


Really? The YB8 I'm building, firstly the brass grommets, that hold the taps in pull out, so I've ground them down with a dremel, so the orings on the fuel tap will seal.

I've eliminated the the reserve switch, because it wasn't working.

I've made a calibrated stick.

I would prefer to run out of fuel at WOT, than to have bimota decide how I ride.

lol....

PS... how is this done when the YB8 runs the Exup cdi? Perhaps when it is running dry, it just doesn't run that well?
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Bud977



Joined: 03 Mar 2013
Posts: 368
Location: Sydney

PostPosted: Tue Jul 03, 2018 8:53 pm    Post subject: Reply with quote

It's a standard FZR1000 thing so it's part of the EXUP CDI. It's Yamaha's virtual reserve switch.

I haven't looked into what happens when you disconnect the system as I've got an Ignitech and custom loom on my YB8 now.
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Fulvia-hf



Joined: 27 Mar 2017
Posts: 14
Location: Netherlands

PostPosted: Thu Jul 05, 2018 9:37 am    Post subject: Reply with quote

I read on the net and in this forum that Thundercat engines stretch their valves. Can this result in a non starting engine?
I assume the engine needs to be dropped from its tight fitting chassis to perform a valve shim job. It might just be a job that the previous owners of my Yb9 have skipped.
My bike has done 44.ooo Km.
A stretched valve might never close fully (I guess it will burn in the end) causing compression problems.

William
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