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Bigusdickus

250 Rev3

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Update on the Beta,

I had a long chat with the bikes previous owner last night, we came to a fair compomise. At no point do I think he has tried to pulll the wool

over my eyes as he is vertualy a neighbor and he has a reputation to maintain localy. So the conversation went down this road, I have a bike I can't use and it's going to

cost time and money to fix. If I take it back he has a bike that needs to be fixed before he can sell it. So the plan is for me to sort it out then he will pay me what I have spent on it.

If the bike as whole had not been in as good condition as it is I probably wouldn't have gone down that route. there are going to be bumps in the road but I think it's a fair compromise.

so the Beta is still in the garage ? 

So where am I at ?, it definitely needs a fan, at present I have no voltage going to the fan.

Can any one help me out with a few questions.

Does an Evo fan fit the Rev3 possibly giving me another option for a replacement.

I have read a lot about stator failures especially on earlia Revs, is this lighting cicuit as well as ignition 

does any one have a resistance reading for the lighting coil or will it just be open circuit if it's failed.

I have an owners manual with the bike but it gives very little actual technical information is there a propper workshop manual, I have googled it but cant find one.

Thanks for any help.

 

Rich. 

 

 

 

Edited by Bigusdickus

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I would double check all the grounds. I am sure if you searched this forum you would find your readings for the stator or call Beta.

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Try Steve at 'uk Motoplat Bradford ignitions'... There are some figures  and testing procedures on his website 

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I think I have found another part of the puzzle. Lineaway I think you may have hit the nail first time. This little box is connected to the fan and the thermostat switch, the yellow wire was left dangling. The opposite end of the yellow is connected to kill switch ?

It's my guess that the yellow wire is the power suply for the fan ? if so why has the other end been connected to the kill switch I am hunting for 

a wiring diagram now ? 

Rich

20181126_142136.jpg

Edited by Bigusdickus

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I am pretty sure the black wire from the cdi connects to the kill switch, so the other tether wire should go to ground. But it has been a long time since I wired a rev 3.

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This part is the voltage regulator aparently as its wired up now there is no power going to it  just the thermoswitch and the fan. 

the wiring diagrams I have found so far appear to be different from what I have colour differnce,and even the basic layout is wrong 

Back to scratching my head ?

Rich.

Screenshot (7).png

Edited by Bigusdickus

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Lineawy you were bang on, The yelow wire is the lighting feed from the stator some one has wired the kill switch through this thinking it's a ground ? 

.I am astounded that this hasn't killed the CDI as it's probably getting a 12v back feed posibly the ignition voltage has canceled it out. Also not sure if this has caused 

any damage to the lighting coil, it is still giving a resistance so fingers crossed. I have a second hand fan comming so when that turns up I will update on my

progress ?

Rich.

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Hi Me2 Thanks for the diagram but this is different from my bike. Your diagram shows two power leads from the stator mine only has one. Posibly 

they changed at some point, It's a bit of a puzzle I think I have nearly got it just waiting for the fan.

Rich.

 

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Jackpot just found this. This is what I have on my bike, everthing on the left of the circuit past the red line is the lighting none of this is on my bike. 

To the right is whats on my bike a single yellow from the lighting coil,this confirms that the two blues from tne thermostat must have some sort of switch

inside the voltage regulator. the later bikes seem to have the fan and thermostat are in the same loop ? well acording to the diagrams that is ?

As long as the lighting coil on mine is still going I should be in business.

 

Rich.

Screenshot (11)_LI.jpg

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On my 2001, the wiring didn't quite match any diagrams but was close enough to figure out. On mine, it was the regulator that was US. It had a clear crack in the bottom and was full of crap.  Fitted a new one but had to change the connectors to fit the older loom. 

It is a royal pain to work on and diagnose as you have to remove the exhaust to get to the rad screw, to get to the electrics. I ended up leaving my thermostat bridged because I just couldn't be bothered removing it all again. 

Edited by al_orange
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Hi al_orange  yep it's a bit of a sod to get at but I think I am nearly there. Just spotted a higher capacity water pump that I may fit while it's in bits, surely can't do any harm. After the fun I have had so far I should at least have a look for peace of mind.

Rich.

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Standard water pump is adequate ,no need to upgrade it.Get the fan working ,then it'll be fine

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The aftermarket pump seems a little feeble. But you might as well pull your pump and make sure it is all good.

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Hi to all.

Just a quick update on the Beta, all smiles now the second hand fan fitted cuts in and out when it should,

the wiring is now done the same as the diagram above, plus an extra earth from the frame at the voltage regulator mount

to the coil. the kill switch ground is conected to the same point and not the genorator coil as before. ?

So on the whole a good learning experience, I have got to know the bike a bit and it's only cost me some time.

I might even get to ride it next weekend ☺️

Thanks to all for the advice.

Rich.

Edited by Bigusdickus
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