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Author Topic: My Suzi T500 Project *New Video*  (Read 163935 times)

Offline Walms

  • Posts: 397
My Suzi T500 Project (New Video)
« Reply #1080 on: Feb 08, 2014, 08:30:36 »
Have you done a leak down test on the motor yet? I know with our triples, with the exhaust and intake sealed, you should be able to hold 6psi of pressure and vacuum. If you have lab seals, you'll have to do both at the same time.
« Last Edit: Feb 08, 2014, 08:33:18 by Walms »

Offline clem

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Re: My Suzi T500 Project (New Video)
« Reply #1081 on: Feb 08, 2014, 11:39:28 »
It seems to be hanging on to the rpm when you let off the throttle... an Air leak or too lean maybe?
+1 on this. The idle tells the story.
"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 johnu

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Re: My Suzi T500 Project (New Video)
« Reply #1082 on: Feb 08, 2014, 17:47:14 »
Ok great feedback!  It only started with the revs not going down since I put the small pilots in.  I will research "leak down test" as no, I have not done it.  What are lab seals?

Going to get a video of me riding the bike when my son comes home on leave this week :)

Offline clem

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Re: My Suzi T500 Project (New Video)
« Reply #1083 on: Feb 08, 2014, 21:23:24 »
Labyrinth seal on the crank. Has nothing to do with the david bowie movie.
"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 HollywoodMX

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Re: Re: My Suzi T500 Project (New Video)
« Reply #1084 on: Feb 09, 2014, 13:46:33 »
Ok great feedback!  It only started with the revs not going down since I put the small pilots in.  I will research "leak down test" as no, I have not done it.  What are lab seals?

Going to get a video of me riding the bike when my son comes home on leave this week :)

Before leak down, have you tested the intake components for leaks like I suggested earlier? It takes 2 min.

A couple ways; while running you can spray starting aerosol between the carbs and the engine and see if it Idles up. If it does you have a leak.

You can use water or break cleaner instead in which case it will idle down as the sign.

Even though it more dangerous I find the starter fluid is more sensitive in telling me there are intake leaks vs the others.
TR1 Build thread: http://www.dotheton.com/forum/index.php?topic=54733.0
Xv920 Tracker thread: http://www.dotheton.com/forum/index.php?topic=59754.15

77 KZ1075 Supercharged - 81 Yamaha XV920rh (x2) - 06 YZ250 highly modified - 08 Hyabusa

"I live my life a 1/4 beer at a time"

Offline johnu

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Re: My Suzi T500 Project (New Video)
« Reply #1085 on: Feb 10, 2014, 19:32:41 »
Did the spray test with water and there are no leaks on the intakes, not brave enough to use the starter fluid ;)  I fitted all new crank seals when I built the motor up, I know how important this is (i use to change seals after every race weekend on my race engines).  I will do the leak down test as obviously there is something wrong but I think maybe I just went too low with the pilots.

Offline Walms

  • Posts: 397
My Suzi T500 Project (New Video)
« Reply #1086 on: Feb 11, 2014, 07:30:41 »

I just went too low with the pilots.

Here's a short video of my bike on first start up. It's dead rich, probably too rich to ride but at least you can listen to how the rpm drops quickly.


Offline HollywoodMX

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Re: Re: My Suzi T500 Project (New Video)
« Reply #1087 on: Feb 11, 2014, 12:12:12 »
Here's a short video of my bike on first start up. It's dead rich, probably too rich to ride but at least you can listen to how the rpm drops quickly.



Starting with one kick I don't think that's super rich especially if it was cold. The air circuit never made a difference with that jetting? I would be inclined to switch to those pilots and lean the needle 2 clips and go for a test drive. 
TR1 Build thread: http://www.dotheton.com/forum/index.php?topic=54733.0
Xv920 Tracker thread: http://www.dotheton.com/forum/index.php?topic=59754.15

77 KZ1075 Supercharged - 81 Yamaha XV920rh (x2) - 06 YZ250 highly modified - 08 Hyabusa

"I live my life a 1/4 beer at a time"

Offline Walms

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My Suzi T500 Project (New Video)
« Reply #1088 on: Feb 11, 2014, 12:18:27 »
Yup, it was... ;) like having the choke on it was so rich.
Confirmed as soon as she went on her maiden voyage.

Offline teazer

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Re: My Suzi T500 Project (New Video)
« Reply #1089 on: Feb 11, 2014, 13:46:14 »
Walms and JohnU are both correct.  Walms bike was way rich and JohnU's bike is NOW too lean at idle with those 22.5s where it was too rich before with larger pilot jets. 

So it needs slightly larger pilots but probably needs to be leaner as it comes off idle.  That suggests a larger cutaway might clean that up.  I also wonder if the pilot air jet system is clogged or maybe the air jet is too small to have any effect.  I think it's a drilling in those carbs and it's worth checking.

Offline HollywoodMX

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Re: My Suzi T500 Project (New Video)
« Reply #1090 on: Feb 12, 2014, 02:07:08 »
Shit I'm confused.  I didn't look to who I was responding to.
TR1 Build thread: http://www.dotheton.com/forum/index.php?topic=54733.0
Xv920 Tracker thread: http://www.dotheton.com/forum/index.php?topic=59754.15

77 KZ1075 Supercharged - 81 Yamaha XV920rh (x2) - 06 YZ250 highly modified - 08 Hyabusa

"I live my life a 1/4 beer at a time"

Offline johnu

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Re: My Suzi T500 Project (New Video)
« Reply #1091 on: Feb 12, 2014, 11:03:27 »
Shit I'm confused.  I didn't look to who I was responding to.

Your confused??? Join the club haha ;D

Offline johnu

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Re: My Suzi T500 Project (New Video)
« Reply #1092 on: Feb 12, 2014, 11:05:09 »
Walms and JohnU are both correct.  Walms bike was way rich and JohnU's bike is NOW too lean at idle with those 22.5s where it was too rich before with larger pilot jets. 

So it needs slightly larger pilots but probably needs to be leaner as it comes off idle.  That suggests a larger cutaway might clean that up.  I also wonder if the pilot air jet system is clogged or maybe the air jet is too small to have any effect.  I think it's a drilling in those carbs and it's worth checking.

Going to take the carbs off today AGAIN!! and check them AGAIN for any blockages ;)

Offline teazer

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Re: My Suzi T500 Project (New Video)
« Reply #1093 on: Feb 12, 2014, 12:46:48 »
John,

The situation you had earlier appeared to be rich at idle or was it just off idle as you started to open it up?  I don't have a full picture of what the symptoms were at different revs/throttle settings with those different pilot jets and air screw settings.

In other words, if you can get the idle OK with say a 30 pilot jet but it bogs as the slides are lifted to say 1/4 open then it is likely to be an issue of transition from the pilot circuit to the main circuit and that's where the cutaway comes in to play.  If it's wet and soggy at say 1/4 to 1/2 it's more likely to be the needle jet. 

Easy check on the air circuit would be to remove the pilot jet , loosen the screw and spray carb cleaner down teh air inlet.  If it sprays back in your eyes, you know it's blocked (and you need to see an eye specialist)  If it sprays out of teh pilot jet holes (up or down) it's probably not a problem. 

Offline HollywoodMX

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Re: My Suzi T500 Project (New Video)
« Reply #1094 on: Feb 12, 2014, 18:19:52 »
I would put in the 35s or whatever you have close to. I would lean the needle 2 clips.

Start the bike. Let it warm up. Test the air screw. If no notable difference, Then with one hand hold the throttle to around 2000 rpm steadily as possible , with the other hand adjust the air screw and see if there is a difference in it idling up and down then. I would also take it for a quick boot to test the needle change. 
TR1 Build thread: http://www.dotheton.com/forum/index.php?topic=54733.0
Xv920 Tracker thread: http://www.dotheton.com/forum/index.php?topic=59754.15

77 KZ1075 Supercharged - 81 Yamaha XV920rh (x2) - 06 YZ250 highly modified - 08 Hyabusa

"I live my life a 1/4 beer at a time"