NEWtronics timing question

Eddie · Post by **Eddie** » Wed Jul 10, 2013 9:10 am

I have put the newtronics electric ign. system on the gt750, and I used a dial guage to set the timing and the original timing marks on the timing plate are all off at around 2.5 ml, so I marked the plate with a marker for the new timing marks, I am wondering if I did something wrong or if my gauge is off because they are all exactly the same amount off? the bike starts and runs at both marks, but I have not taken it for a ride yet to see the difference. The timing was so far off I had to drill the slots on the plate just so I could move the plate more to set the timing on the left cylc., has anybody had this problem? i think its all the way retarded right now, the timing plate is all the way to the left, any ideas? also I set the timing at what the clymer book says, r.l.= 3.64 btdc, c = 3.42 btdc, I know that different years they changed this but I went by the clymer book, my model is a 74 L model , if anybody has a different b.t.d.c. number please let me know, thanks...

Craig380 · Post by **Craig380** » Wed Jul 10, 2013 9:27 am

The 'timing marks' on the 3-legged plate marked L, C & R are actually not timing marks at all, they are really just an assembly guideline for getting the ignition timing into a (very large) ballpark. With some bikes, the marks are pretty close; with others, they're not.

This is why Suzuki recommend using a dial gauge to set the timing accurately. However, you can also use the dial gauge to scribe proper timing marks on the 3-leg plate (as you have done), then you can simply use a strobe or a static timing light to check against your new marks.

If you've used the dial gauge right, then all three factory 'timing marks' should be an equal amount off the correct setting.

The reason why Suzi give a different figure for the centre cylinder is because of the different spark plug offsets affecting the measurement, the actual piston position in mm BTDC would be the same across all three cylinders if Suzi placed the spark plugs central and vertical in the combustion chambers.

Be prepared to adjust the timing a little, depending on what a plug reading tells you, or if you get a little pinging ... my own 380 pings a little at the factory-recommended timing setting, it likes to run less advance.

T350guy · Post by **T350guy** » Wed Jul 10, 2013 12:08 pm

After reading this I thought I would check my GT 750.
It has an Accent ignition and I lined the marks up using the 3 pointer.
Today used a dial gauge ( Center ) and discover what I thought was dead on wasn't , it was retarded firing at 3.1mm.
Once at 3.4mm you can see the marks are indeed off.

Eddie · Post by **Eddie** » Wed Jul 10, 2013 10:17 pm

Thanks for the feed back, I put new plugs in it, and i ran the bike a few miles while the timing was set at the new marks that i scribed. I checked the plugs after the ride and they were white as hell

so either the bike is really lean now, or Im getting better spark plus its really lean or im not getting oil?, I forgot to mention while i was doing the timing I also replaced the oil pump gasket, so now im wondering if the gasket might be covering one of the oilling holes and is now not getting oil! so many things to check and so little time! so I am going to start with the pump, I will open the pump arm to full open while it is at idle and see if it smokes or fouls the plugs if it does then i know the pump is working, then i will put bigger jets in carbs, or should i mess with timing more? so play with timing or re-jet? the bike was lean before but that was when i had pods on it, now i have the stock air cleaner, and it did seem to help it before I did the newtronics kit, now its lean as hell.....

Eddie · Post by **Eddie** » Wed Jul 10, 2013 11:11 pm

ok i ran the bike with the pump wide open and when i checked the plugs the 2 outer ones were white as hell and the middle one was black? so maybe im not getting oil to the outer cylinders? or i have a bad crank seal? or the middle carb is somehow richer than the other 2? i wish that suzuki would have made the oil system like the kawasaki's I recently did a little work on one of my friends mach III and I love the oil system on that, nice fitting that you can unscrew, what a better idea, dont get me wrong I love the suzuki but some of the engineering was bad in my opinion, but thats just me....... now I have to probly take it all apart to see if im getting oil because you cant get to all the lines! this suckkssss,

Craig380 · Post by **Craig380** » Thu Jul 11, 2013 1:08 am

You can't really tell from brand-new plugs, the firing end of porcelain insulator takes time to get a colour. If you've got a magnifying glass and a strong light you can look down the insulator to where it joins the metal body, there should be colour there but it's hard to see.

If you're running the stock airbox & filter, stock jetting and stock pipes, it should not be too lean. If you can see the oil lines are still full of oil with no air bubbles, it will be pumping oil too.

Put the old plugs back in (if they still work), take her for a 20-mile ride at normal road speeds just using half throttle or so, then when you get back home, check the plugs. Look closely at the "end ring" of the plug that is right in the combustion chamber, that's the part below the threads that the ground strap of the plug is welded to.

If it's a coffee-with-milk brown, you're fine. Sooty, dry black, it's rich. Damp black, it's way rich or over-oiling. If it's pale, you're a bit lean. This assumes you're using the correct grade of plug, of course, and only tests the setting for the pilot and mid-range jetting, but it gets you started and you can check the mains later as you open it up more.

Good luck!

Eddie · Post by **Eddie** » Thu Jul 11, 2013 9:18 am

thanks, well i had ran the bike with the pump wide open and only the middle plug got oil, so i think the oil pump gasket might have blocked one or 2 of the holes but im not sure , I took the bike for a 5 or 10 mile run and plugs were white everywhere except the middle plug..

Craig380 · Post by **Craig380** » Thu Jul 11, 2013 9:31 am

Check the lines to the left & right cylinders, if there are no air bubbles in them you can be pretty sure that oil is going through them ...

Eddie · Post by **Eddie** » Thu Jul 11, 2013 2:14 pm

well pump is working i took it all apart and its ok so now i guess i need to ride more and see if plugs look better cus right now they are white...

tz375 · Post by **tz375** » Thu Jul 11, 2013 4:12 pm

New plugs on light load will probably not show any color at all. Bike has to be run far enough and hard enough.

NEWtronics timing question

NEWtronics timing question

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