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Author Topic: My Suzi T500 Project *New Video*  (Read 242010 times)

Offline jpmobius

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Re: My Suzi T500 Project *New Video*
« Reply #1290 on: Sep 13, 2017, 18:42:41 »
The vm34s on my "street" RD have #260 mains just for reference.  Port timing is fairly conservative and the bike is reasonably friendly to drive.  I think the pilots are#35s, but would have to take them apart to know for sure.
Mobius


On a long enough timeline, the survival rate for everyone drops to zero.

1973 RD350 Yamaha build  http://www.dotheton.com/forum/index.php?topic=66498.0

Offline johnu

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Re: My Suzi T500 Project *New Video*
« Reply #1291 on: Apr 11, 2018, 13:20:44 »
Just stumbled across this on my phone while looking for something completely unrelated:
Hey Jim I don't think the porting on my bike is an issue, Eric Kalamaja did the porting and he has done many t500's with a good reputaion :)

Offline johnu

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Re: My Suzi T500 Project *New Video*
« Reply #1292 on: Apr 11, 2018, 13:35:07 »
So I finally got to working on the bike again and changed out the needle and needle jet to cxmans suggestion so now i have;
q0 needle jet
6dh4 needle
260 mains
35 pilot
2.5 slides
air screw 1 1/2 turns out
It fired up first kick with the choke on, then took it straight off choke and it sounded quite good sitting there revved up pretty decent.  So I grab my helmet for a spin around the block but I can tell it's too rich right away.  I get about a 1/4 mile and open it up a bit and it struggled to clear itself but it did briefly in 2nd gear then I shift up to third and I'm down to one cylinder again just like the last test ride.
Push it back to the shop and take out the plugs (BR9HS) and again it is the left side that is causing the problem.
I wonder if there is a problem with the coil?  It's strange that it never goes down to one cylinder until I actually ride it, it runs on two until I get going a little way.

Offline clem

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Re: My Suzi T500 Project *New Video*
« Reply #1293 on: Apr 11, 2018, 15:45:02 »
Electrical issues can fool you into thinking that you have jetting issues. Did you use the old coils and charging system when you initially put it back together?

Sent from my SAMSUNG-SM-G930A using DO THE TON mobile app

"After every war there are soldiers who refuse to surrender. To this day there are still thousands who cling to their 30+ year old motorcycles, thinking that the war is still on, refusing to concede that the four-strokes have won"

1972 DS7 http://www.dotheton.com/forum/index.php?topic=45886.msg505995#msg505995
1983 CB550sc bobber http://www.dotheton.com/forum/index.php?topic=30599.30

Offline 50gary

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Re: My Suzi T500 Project *New Video*
« Reply #1294 on: Apr 11, 2018, 18:32:04 »
John, there is no way that I'd use a "Y" or "T" to dual carbs and .25" might be smallish?  On my '75 T-500 I have a dual outlet Pingle petcock to my carbs. BTW it's a bolt up to the Suzuki tank, I know you built that beautiful tank but I can't recall the bung you used?  The Pingle flows enough for a big drag bike engine, Pingle says "Don't let your Petcock be your main jet"
  Cheers, 50gary
Short track speedskating, cycling, guitars, motorcycles, juggling dynamite. I was born to laugh at Tornadoes.

Offline jpmobius

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Re: My Suzi T500 Project *New Video*
« Reply #1295 on: Apr 11, 2018, 19:50:28 »
So what do you do to get the dead cylinder back running?  It is quite common for ignition coils of any stripe to quit once they get hot (or even just warm "enough" and then behave normally after they cool off.  You have to have some pretty atrocious jetting to kill plugs that quick even with the original anemic (by today's standards anyway) ignition.  50gary has a good point, but 34's have pretty big bowls and likely you would have figured out that you were starving for gas as you would get that cylinder back pretty much straight away after losing it. 
Mobius


On a long enough timeline, the survival rate for everyone drops to zero.

1973 RD350 Yamaha build  http://www.dotheton.com/forum/index.php?topic=66498.0

Offline johnu

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Re: My Suzi T500 Project *New Video*
« Reply #1296 on: Apr 11, 2018, 21:15:23 »
Electrical issues can fool you into thinking that you have jetting issues. Did you use the old coils and charging system when you initially put it back together?

Sent from my SAMSUNG-SM-G930A using DO THE TON mobile app


Indeed I did.  Not sure if you recall but my electrical skills are virtually non existant :(  I wish I could re-wire the whole bike using modern components like many do on here but I just don't understand how to do it.  I fried the original cdi unit because I wired that up incorrectly the first time.  Can't follow the wiring diagram in the manual because my bike has a hybrid loom due to the fact that originally it was a points ignition t500 but was fitted with electronic ignition GT500 engine!

Offline johnu

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Re: My Suzi T500 Project *New Video*
« Reply #1297 on: Apr 11, 2018, 21:19:19 »
John, there is no way that I'd use a "Y" or "T" to dual carbs and .25" might be smallish?  On my '75 T-500 I have a dual outlet Pingle petcock to my carbs. BTW it's a bolt up to the Suzuki tank, I know you built that beautiful tank but I can't recall the bung you used?  The Pingle flows enough for a big drag bike engine, Pingle says "Don't let your Petcock be your main jet"
  Cheers, 50gary
Ok Gary I will do as you suggest.  I'll get a dual outlet petcock and make an adapter from my tank outlet.  I still don't think that's the issue as the float bowls are always full when I take them off.  I'm getting desperate so I will try everything!

Offline johnu

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Re: My Suzi T500 Project *New Video*
« Reply #1298 on: Apr 11, 2018, 21:20:58 »
So what do you do to get the dead cylinder back running?  It is quite common for ignition coils of any stripe to quit once they get hot (or even just warm "enough" and then behave normally after they cool off.  You have to have some pretty atrocious jetting to kill plugs that quick even with the original anemic (by today's standards anyway) ignition.  50gary has a good point, but 34's have pretty big bowls and likely you would have figured out that you were starving for gas as you would get that cylinder back pretty much straight away after losing it. 
All I do is clean up the plug (which is totally drenched in fuel) then put it back in and it fires right up on two cylinders!  Honestly I don't believe my jetting is that far off, I know for a fact that it is close to other peoples ported motors.
« Last Edit: Apr 11, 2018, 21:22:29 by johnu »

Offline teazer

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Re: My Suzi T500 Project *New Video*
« Reply #1299 on: Apr 11, 2018, 23:09:00 »
You are not using the main jets on a short ride unless you are hammering it, so let's go back a step. I can't remember if you tried swapping carbs from side to side to see if the problem changed sides.  Or if you swapped coils side to side to see if that changed things, but those are cheap and easy to do.

Are the plug leads and caps new and tested?

If it is the jetting, try going down one size on the pilot jets just to test that theory and drop the needles to the top clip position and see if that makes any change.