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Author Topic: My Suzi T500 Project *New Video*  (Read 188695 times)

Offline johnu

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Re: My Suzi T500 Project *New Video*
« Reply #1270 on: Sep 08, 2017, 19:55:38 »
Well I finally found some time to work on the 500 today! Totally went through the carbs again (got the petcock sorted too) and went back to my starting point for jetting except for using 35 pilots instead of 40's.

Carb settings:
vm34's
Main Jet - 260
Pilot Jet - 35
Needle Jet - Q2
Needle - 6FJ6
Needle clip position - Start in the middle
Slide Cutaway - 2.5

Premix 25:1 ratio using 110 leaded race gas

So I fire it up and starts first kick without using the choke (it's a hot day) so I let it idle for a while to warm up then try rev it a little bit and same old problemnothing down low at all if you coax it to the main jet it is sweet as a nut! So I take the foam uni's off and clean the oiled up plugs and give it another go and it fires right up. Runs slightly better without the filters but not by much :evil: What I notice though is that there just so much atomized fuel coming out the back of the carbs, if you put your hand near the carb just for a second it gets covered!
I'm not really sure what to do next :shock: Not sure if I did something wrong when I built the pipes and they are affecting it somehow but I doubt they could be too far off.
Lot's of head scratching going on >:(

Offline clem

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Re: My Suzi T500 Project *New Video*
« Reply #1271 on: Sep 08, 2017, 21:07:12 »
A piston port engine will get the air filters a little dirty. If it started with out the choke that would indicate that the pilots are too rich. Can't remember if you posted it or not but did you tune for the highest idle on that size pilot?

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Offline farmer92

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Re: My Suzi T500 Project *New Video*
« Reply #1272 on: Sep 08, 2017, 21:46:29 »
What are you running for oil?
If it's synthetic you could probably cut that ratio back a bit i would think. Certain racing synthetic oils have higher flash points so they are stable up to higher temps but they may foul up plugs a bit more if you aren't pushing the engine constantly.
Maybe something to consider.


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Offline jimmer

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Re: My Suzi T500 Project *New Video*
« Reply #1273 on: Sep 08, 2017, 22:11:06 »
Clem is spot on. Piston ports are sloppy, and when you factor in chambers and wild porting, it really juices up low speed stuff. I don't remember what your porting is, btw.
Yamaha Blaster Bike                                                                  Suzuki T500 Titan Twingle

Offline jimmer

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Re: My Suzi T500 Project *New Video*
« Reply #1274 on: Sep 08, 2017, 22:12:12 »
And how is the mid range roll on?
Yamaha Blaster Bike                                                                  Suzuki T500 Titan Twingle

Offline johnu

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Re: My Suzi T500 Project *New Video*
« Reply #1275 on: Sep 08, 2017, 22:34:25 »
Thanks guys for the patience, input and responses :)  I'm using Castrol 747 which I don't believe is synthetic. 
Jimmer, mid range roll on ??? I have idle and top end (main jet) nothing in between.

Offline jimmer

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Re: My Suzi T500 Project *New Video*
« Reply #1276 on: Sep 08, 2017, 22:46:03 »
Porting?                                                                   This bike should pull like a freight train. The first port job I ever did,(20 years old) I made a perfectly good cylinder rev like hell, but had zero torque, and was slower than stock! Hard lesson for sure.  So, what porting do you have?
Yamaha Blaster Bike                                                                  Suzuki T500 Titan Twingle

Offline jimmer

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Re: My Suzi T500 Project *New Video*
« Reply #1277 on: Sep 08, 2017, 22:55:54 »
I really wish you were closer. Such an awesome build,I'd love to help you get it sorted out. Keep plugging away .
Yamaha Blaster Bike                                                                  Suzuki T500 Titan Twingle

Offline jimmer

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Re: My Suzi T500 Project *New Video*
« Reply #1278 on: Sep 08, 2017, 23:17:11 »
Just stumbled across this on my phone while looking for something completely unrelated:
Yamaha Blaster Bike                                                                  Suzuki T500 Titan Twingle

Offline teazer

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Re: My Suzi T500 Project *New Video*
« Reply #1279 on: Sep 09, 2017, 00:48:54 »
I seem to recall that it was ported by a third party who may not want the porting data released.

Did I read that right that you have idle and main but no mid range?  That suggests either slide or needle & jet combo is too rich by far. 

What other needle and jet combos have you tried and what were the results?