SRX400 still not doing its thing.........

[mini-thumper]

You may remember that I bought an SRX400 a few months ago that had an 'interesting' problem. Starting is easy, pulls away OK, but won't rev past 3,000rpm for first five miles then runs OK. If the bike is stopped, for petrol etc., you are back to 'square one' and won't pull past 3K. Took the carbs off (ba**ard to get off, easier to get on) and they seemed alright - very clean and no crap. Replaced CDI unit with second-hand one off same model and it had no effect. My question is again - "What could th problem be?" Could it be the generator windings (as suggested by the previous owner)? What about the coil or HT lead?

Any/all suggestions gratefully received

Cheers
Boyd

[themoudie]

Aye Boyd,

You'd have thought that if it were the coil or HT lead, that heat would break the insulation rather than improve it. Also why does it do it when stopping for petrol, as the engine won't cool that much. [Unless your waiting for GC! ;-) OOOOh u beast!]

At present 'Sally' sometimes starts and runs, without or with only a weak current to the ancilliaries. It requires a warming up period of 2 - 3 miles after which the 100kph warning light will suddenly light when travelling above 100kph. Indicators, horn, headlight and brake light are all feeble and or intermittent during this period. I think it is an intermittent earth within the alternator. I stand to be corrected on this.

So far neglect has not landed me in trouble. Waiting for engine heat, vibration or whatever has proved succesful, so far. Only once have I gone further than 5 miles for it to start working.

Somewhere in the Yamaha or Clymer XT manual, I'm sure it is written that measuring alternator outputs needs to be done with a temperature above 60 degrees F, I think. Why? I have no idea.

I suspect the Edinburgh seller was correct, but I'd love an auto 'sparkie' to tell us yeah or neigh.

Regards, Bill

[Steve H]

A technique I used once to diagnose a problem on a Morini was to connect an ignition strobe (I used a cheap inline one) to the plug, strap the gun in a position that allows you to see it (but not blind you) and then ride the bike. Watch the light when your getting to 3000 rpm and see what happens. This wont tell you whats wrong but should indicate whether its electrical or not. I should also have an alternator on my spare engine, which you could borrow to eliminate it.

[mini-thumper]

Thanks for you replies Gentlemen. I will no doubt have some fun'n'games over the next few days!

Boyd

[Alan#307]

Hi Boyd
I have a Clymer manual for a XT350 and i am sure the chart that is mentioned above is in there,would you like me to send you a copy?
Regards
Alan

[beeman]

Hi boyd
If you want to borrow the spare srx to swap bits from give us a call,
beeman