My Suzi T500 Project *It's Alive Video*

johnu

Active Member
DTT BOTM WINNER
Re: My Suzi T500 Project *New Video*

cxman said:
sounds like your throttle slide cut away my have gotten out if size for the mods you have done
Maybe need a larger cutaway to let more air in?
 

cxman

Active Member
DTT SUPPORTER
Re: My Suzi T500 Project *New Video*

i need a review of what size carb and what you have in the carb slide jet needle needle pilot main and air correct

motor and mods i have lost my place sorry

so i cant tell if you need richer (smaller cutaway) or leaner

from the size of the pilots i am wondering if you need smaller or you have to big a jet needle and no low end air velocity

so you have to run big pilot

fill me in then i will know
 

johnu

Active Member
DTT BOTM WINNER
Re: My Suzi T500 Project *New Video*

Cx man' here is the spec on my carbs:
vm34's
Main Jet - 260
Pilot Jet - 25
Needle Jet - Q2
Needle - 6FJ6
Needle clip position - Start in the middle
Slide Cutaway - 2.5
25:1 premix using castrol 747 and Sunnoco 110 unleaded race gas.
 

johnu

Active Member
DTT BOTM WINNER
Re: My Suzi T500 Project *New Video*

Ok so I fired it up today and she does run better on the 25 pilots. Still not great but I think I will try lowering the needles a little bit to see if that helps. It still seems woolly down low. While it was running I whipped off the uni filters to see if that what make a difference and it seemed to be marginally better. What I noticed is that when you give it a big handful of throttle it seems to initially blast a good amount of vaporized fuel out the back of the carbs.

I will put the filters back on and take it out for a few miles tomorrow to see if it gets any better as I'm riding it. Got to go and pick up some more unleaded race fuel first :)
 

50gary

Under the Limelight
Re: My Suzi T500 Project *New Video*

John, what does your spark plug(s) look like? Check them tomorrow on your ride.
Cheers, 50gary
 

cxman

Active Member
DTT SUPPORTER
Re: My Suzi T500 Project *New Video*

first verify your initial timing and timing advance

and i found some old notes (old)

last race bike i messed with had this

Pilot - 35
Cutaway - 2.5
Main Jet - 260
Needle Jet - 159Q0
Needle - 6DP17 in second groove from top

no air correct jet
 

johnu

Active Member
DTT BOTM WINNER
Re: My Suzi T500 Project *New Video*

Well I rode the 500 today and it was not good. First off it had nothing down low then after about 1/4 mile it started running on one cylinder. Managed to ease it back home and took the carbs off. Left side carb had no gas in it and the left side plug was clean and not burnt at all. Turned the gas tap on and a modest trickle coming from the right side fuel line and only the slightest drible on the left. Disconnected the fuel line at the fuel tap and fuel flow there but not great. Going to remove the tank and check the fuel tap for blockage. I have my single fuel line coming out of the tap to an inline filter then another piece of single line to a Y piece then to the carbs. Not sure why more gas flows to the right side than the left ???
Once I get the gas flowing correctly to the carbs I'm going to reinstall the 35 pilots As I see it there is no reason why the bike shouldn't run half decent with them in there.
 

50gary

Under the Limelight
Re: My Suzi T500 Project *New Video*

How large, "inside" diameter is the fuel line from the petcock to the Y?
Cheers, 50gary
 

johnu

Active Member
DTT BOTM WINNER
Re: My Suzi T500 Project *New Video*

cxman said:
first verify your initial timing and timing advance

and i found some old notes (old)

last race bike i messed with had this

Pilot - 35
Cutaway - 2.5
Main Jet - 260
Needle Jet - 159Q0
Needle - 6DP17 in second groove from top

no air correct jet
Thanks!
 

johnu

Active Member
DTT BOTM WINNER
Re: My Suzi T500 Project *New Video*

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 :mad:
 

Attachments

clem

static fluff
DTT BOTM WINNER
Re: My Suzi T500 Project *New Video*

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?

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

farmer92

Member
Re: My Suzi T500 Project *New Video*

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.


Sent from my iPhone using Tapatalk
 

jimmer

New Member
Re: My Suzi T500 Project *New Video*

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.
 

johnu

Active Member
DTT BOTM WINNER
Re: My Suzi T500 Project *New Video*

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.
 

jimmer

New Member
Re: My Suzi T500 Project *New Video*

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?
 

jimmer

New Member
Re: My Suzi T500 Project *New Video*

I really wish you were closer. Such an awesome build,I'd love to help you get it sorted out. Keep plugging away .
 

jimmer

New Member
Re: My Suzi T500 Project *New Video*

Just stumbled across this on my phone while looking for something completely unrelated:
 

Attachments

teazer

Well-Known Member
DTT BOTM WINNER
Re: My Suzi T500 Project *New Video*

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?
 

DTT Bike Of The Month Gallery

DTT Light or Dark

www.cognitomoto.com
https://www.townmoto.com
www.speedmotoco.com
www.jadusmotorcycleparts.com
www.lostapostle.ca/
www.sparckmoto.com
Top Bottom