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Discussion Starter · #1 · (Edited)
Hello there :)

Im the new happy (i hope) owner of Benelli TNT 1130 from 2005. I just bought it from my friend who bring bikes from Italy (im from Poland by the way :) )

The bike is amazing when it comes to riding, and its just gorgeous for me :)

Buut i have some problems with it. I read a lot of post on this forum about z25 gear upgrade (mine doesn't have this upgrade imo, becouse sometimes he won't starts when hot). But this isn't a main issue.
Bike stalling on idle when i stop before lights etc. When engine is cold it's ok, but when hot, bike just turning off when im breaking or waiting for green. Not everytime, mostly. But every time the fans turn on, the engine immediately turns off. It's just like pff, i don't have even time to rev him, It's soo frustrating to be honest. After stall sometimes he starts immediatly, but sometimes i have to wait a bit, becouse starter doesn't want to turn the engine (i think that's becouse that legenardy z25 gear upgrade) Interestingly, when i turn engine off by myself, even when he is hot, there is no problem to start it again - only when he stall.

Other thing that i notice, is that sometimes engine ticks a bit, like one cylinder turning off for a second. Revs are about 1,2-1,5 when hot, but they are slightly wavy on "better"map. When i click other map "slower one" its littlebit worse. I also noticed, that my lights are turning off when idle, but i have read that it's quite normal for this bike. My Benelli has new sparks, battery (but it's 12v normal battery, not lithium one - mb that's the problem?) oil, filter and all that exploitation "stuff". Can u tell me, why my new love stalling everytime, specially when fans turns on? Temperature looks fine, i mean it's like "3/5" of scale when fans turning on.

My friend who service motorcycles, and sold me that one, looked at alternator, and it's looks fine (at least that's what he said to me). He also checked the clutch and replaced some parts there - much quieter now.

Im waiting for diagnostic cable to check it with computer, but i just can't sit and wait without knowing, i hope u can understand me :D

I will be very grateful if anyone can help me, cheers and have a nice day :) (or night if u reading this late :D) (sorry for my english, if it was bad)

I forgot to mention - I have an accessory silencer. I bought him like that.
 

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It does sound like the z25 problem. Could the stalling when the fans come on be coincidence? Does it do it at other times. Obviously the fans come on when the engine is hot and z25 problem mainly happens when hot, is it slow to turn over after it has stalled. Other issues with stalling are stepper/TPS/mixture.
 

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Discussion Starter · #3 · (Edited)
Hello, thanks for u answer. I think thats not a coincidence with that fans. It happend 3 or 4 times (sometimes he stall just when im breaking, or just when idle but not often). But everytime when fans turning on, engine stall immiediately. I don't have even time to rev him up, becouse it's that fast. For ex. yesterday. I went back home, and i left Benneli on idle when i was opening garage doors etc. I came back, drive a bit and then fans turns on - stall immiediately when they turn on. But yea, few times he stalls on idle -> working very well, and suddenly dead, even without fans turns on, but fans are killing him even more instantly, like there is not enough power to maintain engine and fans running together :/ What u mean about temperature sensor? I read recently that u have to move him somewhere, is it true? Other question, is it possible that sth is wrong with computer or wires? I think that no one can tell without seeing the motorcycle, but i will let u know if I'll find out sth :)

But sth what makes me wonder is that he start instantly when i turn engine off by myself. Even second after switching off. But when he stall, even if cold he won't start at first moment. I have read that z25 problem always appears when the engine is hot, not only when engine stall. Or im wrong about it :)

Greetings
 

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You've definitely got the Hot Start problem, which you can solve by upgrading the alternator drive shaft / Z25 gear. You need to fix that ASAP because its doing damage. You may find yourself in the same difficulty as Sprocket, in that the shaft was so twisted that he had to cut it out.

Stalling as you slip into neutral when coming to a stop is a common issue that has more to do with the slow reaction rate of the stepper. It's common with many makes of bike that use steppers. It can be improved with careful tuning. But that is not your main issue here.

Your second problem - stalling when the fans are switched on has nothing to do with the Z25 gear. That sounds more like an electrical problem. Electrical issues are the first place to look when the engine simply cuts out. It's like when you hit the kill switch or the tip over switch deploys. Things get quiet immediately.
Normally, if the fans are drawing excessive current a fuse will blow. That can happen if a fan bearing is shot.
As far as I can tell, from what you state, the engine stops and the fans start, and continue running, so that would suggest that the fans are fine.

My bet at the moment is that you have a problem in the loom that is blocking a signal to the ECU only when current is supplied to the fans. Crank shaft angle sensor maybe? That would seem to be borne out by not being able to start the engine immediately - the fans would start up immediately reintroducing the cause. Waiting a short while would allow the engine temperature to drop below the fan switch-on temperature.

To test that theory you'll need to connect TuneECU to get an accurate engine temperature measurement - the gauge is notoriously inaccurate. The fans should come on at 95C I think. So remove the fans relay and start the bike. Let the temperature build beyond the temperature that would normally trigger the fans. If it will do that, then re-insert the fans relay while the bike is running. If there is a short in the fans circuit, the engine should cut out immediately.

Solve the Z25 gear first though. It does need to be fixed NOW.
 

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Discussion Starter · #5 ·
Thanks for that information :) I will tell everything u told me to my friend who is servicing my bike. I will let u know if i will figure out what was the problem. I will have diagnostic cable at the end of the week, so for sure, i will know much more then :) I hope, it's possible to get this gear parts somewhere
 

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I hope, it's possible to get this gear parts somewhere
Talk to / email Alex at Maniac Motors <[email protected]>
QtydescriptionP/N
1Alternator drive shaft & Z25 gearR300000081000
1Belville washerR310032007000M
Alex has sold dozens of these and if you get him to quote, his prices are pretty good as well. He accepts PayPal.

You'll also need an
M10x1.25x30 R8.8 set screw
You can get from your local bolt supplier.

Don't put a washer under the Belville washer.
Position the Belville washer so that it "points" to the bolt head.
Use Loctite 243 on the bolt, not 648 as the workshop manual suggests. You may want to get it apart again, and if you use 648 you will have to heat it up, a lot.
 

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Discussion Starter · #9 ·
Thank u soo much, for all that informations :). For sure, i will check that z25 gear, and upgrade it if I have old one. Im still waiting for that diagnostic cable to check everything. To be honest, im soo impatient, and i made some test drives today, and i noticed few things. First of all, i triggered fans while riding. They turn on, and engine didn't stall - but i have to keep revs about 1,5rpm, couse otherwise he starts to behave very uneven (is it good word? i mean rpm are jumping from 1.4 to 1.0k and he want to stall). Engine sounds good, only sometimes i hear that one cylinder "sneeze", and i can feel little pull. But since I'm keeping him on 1,5k revs, he didn't stall. I stopped few times for a second, and start very hot engine second later without any problem, he start just like this, like new one :eek:

I think, that the only think i have to do, is wait for that cable to check everything with computer. Becouse it can be anything, TPS, stepper, injectors, fuelpump or who know what else :(

Thanks again for that information about z25 gear. I will let u know if i figure out sth, mb someone will need that informations :)
 

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Discussion Starter · #10 ·
Hello after few months :)
Im working on my bike, i ordered z25 gear parts, it will be here in few weeks. I solve (i think) problem with this stalling. When i bought cable (it was last year winter, december), we connected Benelli to the computer, and we started to look around. We changed CO values, from 1.00 to 1.05, 0.95 (etc) but it wasnt working. After several attempts we used option "calibrate throtle" - and the problem was gone. No more stalling, no more wavy rpm - it was all good (except that hot start problem). Buuut, after 3-4 days and few rides, my idle rpm stuck on ~2k or little higher. It was strange tbh becouse engine breaking was gone. I felt like i was riding on clutch. Then was a winter so i wasn't riding at all. After winter, 2 weeks ago i was riding, and rpm's was normal - around ~1,5k. He started amazing after 2 months of waiting i was quite happy tbh :) What's going on with this? Stepper motor or sth? (im really bad mechanic)

I notice other problem. My fuel consumption was around 11-12,5 L /100km. I know, that TNT is hungry on fuel, but is it normal? I thought it will be around 8-9 (max 10l/100km) - not 12 :(. Is it normal, or we have to check sth?

Cheers, and have a nice day :) (sorry for my english if it was bad :) )
 

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I will follow this topic because have the same issues
My tank is empty after 70 km drive
I be now in Holland for a few weeks/months and will order a Lott off parts here in Europe and I hope with my cables for tune Ecu I can fix the problem also
First thing I gave to do when I am back for repair the bike is reset the throttle
position sensor and synchronise the throttle body's and adjust the CO
O yes my bike have run only now for 3000km!!

I will follow this topic
 

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Discussion Starter · #12 ·
Ok, i need ur help again. Finally i got z25 gear set. I bought it from offical Benelli seller in Poland, they orderd it from Italy. I had to wait more than 4 months, becouse of coronavirus. But yea, i finally got it but idk why, this new set doesnt have those triangle marks. Did they send me wrong one, after 4 months of waiting? Or they just dont have those triangles, but this is new, good set. Please check photos in link https://imgur.com/a/lyqMqnL.
Last time i was riding my bike was 2019. So i will really get angry if they sent me wrong one :mad:

Photos : https://imgur.com/a/lyqMqnL
 

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Hi ,
Long time to wait I guess .
But indeed they are the correct parts and don't need to be aligned in a special way any more ..
The parts I bought a little while back were exactly as yours are .
Happy riding
 

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That's indeed a long time for getting your parts,

I order it n Germany and 1 week later i have all parts i need for my bike.

Now i have to wait when i can go fly back to the tropics Island and repair/modificate my bike

I have the same Z25 gear set like the pictures
 

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Discussion Starter · #15 ·
Uff, thanks for answers :) I can sleep without worries now :D
Btw, i ordered it (and paid) before corona started, but package stuck somewhere in Italy :( But yea, i have it now, and im happy :D
 

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Discussion Starter · #16 · (Edited)
Hello again :)
My bike is running again. After 5 months. New z25, new cables, new battery, and few other things. It starting quite good, even if hot. But as always, there is another problem i see. Its getting hot. sometimes very hot (if i can trust my gauge). What are the temparatures on gauge? I mean, if indicator is on third one (this big one in the middle) is it 90*C? Couse whole time, indicator is on 4 or even littlebit after 4 one. When I ride, its cooling a bit, but it took ages to cool it down. It's not very close to the red, but still, it makes me nervous. Is it normal this days? I mean its +30*C outside. My previous Honda was getting 104*C Max, then fans turns on and temperature was going immediately to lower than 100*C. Here idk. What is the temperature if it in the middle? I will check this next week with computer, but im littlebit nervous again :(
Fans are turning, but not very often. I mean they turned on few times, but not whole time.
So is it normal, is something wrong (thermostat?), or gauge is broken? Thanks for answers :)

I forgot to add. When its cold and i start the engine, It tooks about 1 - 2 minutes max to get to the middle of temperature gauge. (middle - mean the third). Is it normal too? :)
 

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Hi great to see you've got the bike back together and running.

My 1130 engine warms up quickly too so I'd say that was normal .
You've got to remember these engines are light weight and basically a race engine I guess .

As for the fans switching on and then off
This too is a normal condition , you must remember these bikes are not really meant to be sitting still while running for more than a few minutes at best .

Your temperature guage may be displaying a littler higher than than the actual temperature it should be getting from the temperature sensor.
But the fact the fans cut in and out are a positive encouragement that all should be ok .

As you say the only way to fully understand the actual true reading will be when you plug it in .

Thanks for updating us with good news 👍
 

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Discussion Starter · #18 ·
Thanks for answer :) I guess, only thing i can do to be 100% sure, is to check this with comp :) Tbh, i watched few videos on youtube (onboards), and nearly every one tnt 1130 there, is reaching high temperature (at least on gauge) while riding.
I guess, I have to change my thinking. Its not Honda or Yamaha :eek: I have to get used to the fact, that everything may be little different here :D
 

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Don't trust the gauge. Its only an indicator. Benelli acknowledged this when they removed the numbers after the Tornados were built.
Connect TuneECU for an accurate reading and correlate that with what the gauge shows.
If it is running over 100 C consistently, check the thermostat. It could be stuck closed. That would be unusual though. They usually fail partly open.
 

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Discussion Starter · #20 · (Edited)
Tommorow i will connect my bike to the computer, and i will know more :) Tbh, i really want to make this bike perfect one. I mean, im soo annoyed when i hear "strange noises" or etc. After changing Z25, engine starting quite good even when hot, but sometimes, when its veery hot (at least if we trust gauge) engine spin a bit slow 2-3 times, and then start. One time, i heard strange metalic sound after 2 slow spin. I click starter another time and it starts from 1 spin. Is it normal? It's happening only if engine is very hot. Saying "hot" i mean around 4 indicator on gauge. Is there another thing that have to be done? :( May it be sth with R19113111A Starter clutch? Or i'm just too nervous and everything is fine :)

As i said before - brand new battery - Exide ytx14-bs, and upgraded cables from Maniac Motors, alternator is in great condition.

Other hand, there is enormous diffrent beetwen now, and before. Other thing is, as I saw, previous owner changed this z25 gear, becouse that one i bought, was identical like i had before.
 
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