Triumphrat

HinckleyBorn

Hi guys, I have recently bought a Japanese market 1998 Adventurer. My dealer here has fitted the non restricted inlet rubbers, the air box is completely standard, I have fitted TBird peashooter pipes with the end baffle drilled with a 21mm hole saw. The dealer told me that the carbs (Mikuni) were rejetted . I have checked the jets, mains #90, pilots #40. float levels 17mm. Fuel mixture screws 2 1/2 turns out.The bike appears to run well but the tail pipes are sooty as are the plug bodies but not the center insulation. My biggest problem is starting. When I picked the bike up from the dealer he explained that all the triples only fire when you take your finger off the starter button. To check this I removed the plugs, laid them on the head and cranked the motor, sure enough there was no spark until I stopped pressing the button. Is this normal? and are my jet sizes ballpark?
I must say that I really love this bike, the build quality is awesome and the sound of the motor... bliss. I was born in Hinckley but have lived in New Zealand for the last 35 years and have always had a bike (sometimes several) and this is by far the best. Sorry for the ramble, I hope someone can clear up these questions
Thanks, Phil.

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KD5QOQ

Can't speak for the jets but the spark thing sounds like a weak battery.

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Jimbo
Kroger Plus Member
99 Adventurer
05YZ450F
89 CR500
81CR250

Falcon_52

Phil:

The spark plugs will fire while turning the engine over with the starter. I just did it a few weeks ago while diagnosing a potential coil issue. I held the spark plug against the head and cranked the engine to look at the spark color/size. It fired several times.

So, does the engine run okay once started and you are just having trouble getting it started?

Noel

jimmyj900

[quote=HinckleyBorn;872818]I believe that's the stock configuration (someone please verify!) and not a rejetted configuration.

If your plugs have clean insulators (white or light tan) then it's pretty well stock.

No, that's not normal. The plugs should fire continuously when starting -- except for the first full revolution of the crankshaft while the igniter is figuring out the crankshaft position.

It's pretty improbable that there is some ignition defect preventing the ignition from firing while cranking, but I'd test that by hanging a spare sparkplug from a plug wire, grounding the big end to the chassis with a jumper cable and cranking the engine. (Be sure it's in neutral with the clutch pulled in!) There should be a spark while cranking.

It's also quite possible that your battery is weak and that while cranking the voltage is dropping to the point that the ignition can't fire.

Clean the battery terminals, charge the battery fully and try again. (It takes about 7 hours to fully charge a 14 Amp-Hour battery with a 2-Amp charger.) If charging the battery makes no difference then it may be time for a replacement.

Jim

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HinckleyBorn

Thanks for your replies, I did check battery voltage while cranking and it didn't drop below 12v. I have now charged the battery and will try again tonight. I did notice that above the battery box there are 2 large white multi connectors, 1 doesn't connect to anything and the other has 1 loop wire.
Attachment 2123
Is this standard. The coils are PVL made in Germany and non of them spark until I stop pressing, I didn't think that it was normal but thought that it was some sort of design thing to help protect the starter clutch, as I know that they did give problems. Well off to work now, catch up later. Thanks, Phil.

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jimmyj900

Those are for installation of the factory alarm system. If you remove the connector with the jumper it will disable the ignition, so don't!

Jim

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Tre900

..just cause no one has mentioned it you HAVE to hold the clutch in EVERYTIME you start it.

HinckleyBorn

How red faced am I? When I got home tonight I reconnected the fully charged battery and tried cranking, still no spark until I stopped pressing. So I ran a jumper wire from bat+ straight to the starter with the ign on, continual sparks, I also by passed the safety switches and thumbed the start button, continual sparks!! Came in checked the forum and Tre900 had posted "you have to hold the clutch in everytime you start it". I don't have a hand book and my Triumph dealer had told me that all triples only fired when releasing the button!!!! I had been riding it around for 2 weeks eventually starting it this way when I decided it wasn't right and decided to investigate. If only I had asked you Triumph experts earlier. So thanks but I still need to know std jetting for my Mikunis, can anyone help? Again many thanks for your prompt and useful replies, regards, Phil.

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musicisinmysoul

Well I didnt know that either? although I do hold in the clutch I thought it was to let the engine turn more freely? is that right that it wont start with clutch out?

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HinckleyBorn

Well it will start but not easily, I can't understand why it is designed like that, surely to be a true safety device it shouldn't start at all if the clutch lever isn't pulled in. Still my problem solved, just need Mikuni jet sizes then I'll put the carbs back on and enjoy instant starting.

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