What else is there?

Cexley · Post by **Cexley** » Wed Jul 21, 2010 11:08 pm

I'm losing it big time here. My KR1 seems to have a totally random state of tune. Sometimes it flies, sometimes the power goes flat and it refuses to rev out. Sometimes it packs up completely. So far, I have done:

Engine:-
New rings
New Small ends
New KIPS valves
New KIPS linkages
Cleaned tank out
Refurbed fuel tap
Cleaned carbs, set float heights and tried every needle setting
New carb inlet rubbers
Changed expansions from KR1 to KR1S

Electrickery:-
Checked all earths and added an extra one from cylinder head to regulator mounting plate.
Cleaned all electrical and fuse connections
New battery
Checked all electrical outputs as per manual (all normal)
Changed coil/HT leads
Changed regulator
Checked sidestand switch
Checked clutch cut-out switch
New plugs

...... and the effing thing still won't run right. The hotter it gets, the worse its moods become. It runs sweet on tick over and revs normally at a standstill. There are no fluid leaks and all fluid levels remain stable.

On the rare occassion it all comes right, she flies off like a scalded cat. However, most ride outs, it goes sick on me. It almost feels like the ignition is randomly retarding or a fueling issue. The longer you ride it, the worse it all gets. This KR1 is giving me serious OCD. Can anyone save me from ending up in the funny farm or setting fire to it?

falconman · Post by **falconman** » Thu Jul 22, 2010 6:33 am

Do a pressure test. Sounds like crank seals.

Cexley · Post by **Cexley** » Thu Jul 22, 2010 11:40 am

Cheers for the tip. If it was crank seals, surely it would be burning the gearbox oil or leaking into the alternator housing (depending which side the seals have gone). The problem is so inconsistant, I find it hard to believe the seals are randomly failing. Could it be sticking reed valves?

ScottaKR · Post by **ScottaKR** » Thu Jul 22, 2010 12:34 pm

You mention it gets worse the hotter it gets. Just how high does the temp gauge get?
Also, how old are the plugs and which ones do you use? May be worth chucking in a fresh pair just to rule them out if they're not already new.

Cexley · Post by **Cexley** » Thu Jul 22, 2010 1:32 pm

Plugs are new. Also tried Iridium. The bike runs at normal temp. I guess what I am saying is the longer you run it, the worse it gets. It doesn't actually overheat. Plug colour also looks normal, although I have not done a plug chop when it is running sick.

I'm wondering if it is some sort of electrical break down - hence changing the coil and rectifier. I guess I could carry on and do the alternator, pick ups, ECU, diode, wiring loom etc etc. This is the problem with random stuff. I wish whatever it is would just fail completely!

Yatsushiro · Post by **Yatsushiro** » Thu Jul 22, 2010 1:35 pm

Check the petrol tank breather; If it's blocked, or restricted, you'll have fuel supply problems.

Hows your air filter ?

ScottaKR · Post by **ScottaKR** » Thu Jul 22, 2010 2:22 pm

If it's not the fuel system (ie. random crud getting into carbs), then I'd be seriously looking at the stator. Many people have found that even though they may test fine according to the manuals specs, they can still be on their way out. Worth swapping out if youve got a spare one and a puller.

Cexley · Post by **Cexley** » Thu Jul 22, 2010 4:07 pm

Thanks guys. I will check out the breather as this makes total sense, as the longer you ride it, the worse it gets.

Failing that, it is off to investigate the stator. However, I don't have a spare, so might end up on the scrounge to borrow one later. Anyone need a good coil and/or rectifier? I keep buying bits off fleaBay it doesn't need!

Man, am I going to give myself a good kicking if it turns out to be a blocked tank breather. Craig

JanBros · Post by **JanBros** » Thu Jul 22, 2010 6:21 pm

I bet my money on the stator

Luders · Post by **Luders** » Thu Jul 22, 2010 7:21 pm

I could probably use a spare coil and HT leads. Are they the same on the KR-1S?

Cexley · Post by **Cexley** » Thu Jul 22, 2010 9:50 pm

Well I have been out for a spin and the same old routine took place. The fuel tank breather pipe is clear. When it started to go sick and gutless, I pulled over and opened the filler cap. No affect whatsover. Just so weird.

Just swapped the plugs to iridium and will give it another try, but the stator is looking like the prime suspect now.

As far as I am aware, the coil is same for both KR1 and KR1-S. I also have rectifier/regulator. By the way, once I get he flywheel off, is there anything I should be looking for re. failing stator etc?

I'll take a look in the electrical section of the forum for some tips. Is there a way to bypass all this cr@p and just run it on a total loss battery setup just to prove what it is by a process of elimination?

Luders · Post by **Luders** » Thu Jul 22, 2010 10:27 pm

Electrics are not my strong point Craig. If you can't see it or hit it with a hammer, it's voodoo to me

How much do you want for the coil?

Cexley · Post by **Cexley** » Fri Jul 23, 2010 9:50 am

Whatever you are willing to pay. I paid £20 for it last week. I've tested it on the bike and it works fine. Say £20 including postage and packing?

Luders · Post by **Luders** » Fri Jul 23, 2010 10:14 am

That's fine, I'm just off to Aberdare for the weekend.

Drop me a PM with your PayPal details and I'll drop you a message when I get back.

Thanks, Ben

TwoStroke Institute · Post by **TwoStroke Institute** » Fri Jul 23, 2010 2:35 pm

I'll bet Jan's money as well on either the stator /CDI