SuzukiSavage.com - Big Bore Bobber Build

Christof13T Full Member Offline SuzukiSavage.com Rocks! Posts: 211 Vicoria, Texas Gender:	Re: Big Bore Bobber Build Reply #135 - 02/10/18 at 09:13:06 The crushed RYCA pancake filter. ..
Back to top	tmp_9244-20180210_0908051651644658.jpg IP Logged

Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 17893 Camp Springs, Kentucky Gender:	Re: Big Bore Bobber Build Reply #136 - 02/10/18 at 09:18:28 Until you get rid of the stock petcock, you really don’t know if the carb is or isn’t working properly.
Back to top	Someday I will be old......But not today! IP Logged

Christof13T Full Member Offline SuzukiSavage.com Rocks! Posts: 211 Vicoria, Texas Gender:	Re: Big Bore Bobber Build Reply #137 - 02/10/18 at 09:54:16 Petcock is toast. The little vacuum mechanism is shot. It wont even pass fuel in prime at this point unless I apply and sustain a pretty heft vacuum on the line...Fortunately I have a spare that seems to function like it is supposed to. Have the tank draining now so I can swap it over and see what's what...
Back to top	IP Logged

Christof13T

Full Member

Offline

SuzukiSavage.com
Rocks!

Posts: 211
Vicoria, Texas
Gender: male

Re: Big Bore Bobber Build
Reply #138 - 02/10/18 at 10:27:24

Replaced the petcock, Got it all primed up and it fired up no problem.
Got it on the road and it made it to 30mph before falling on its face.
It's like a run out of available fuel, or loosing spark kinda falling on its face...

I might have to just take a video...

Anyway... The petcock is supplying it with all the fuel it needs... It is holding prime with no air intrusion and i can see fuel flowing freely through my hose in unison with the throttle I give it.

It currently has the 170 main jet in it.

I pulled the sparky just to have a peek and it was ashy like lean running and hot.

Back to top

IP Logged

norm92de Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 1180 El Paso TX Gender:	Re: Big Bore Bobber Build Reply #139 - 02/10/18 at 10:34:37 If you have a 170 main jet and it is still lean I'd say you have an air leak somewhere.
Back to top	2014 S40. Raptor. idle mixture adj.Needle raised one notch. 4000' altitude. Stock jets. Shell Rotella synthetic. IP Logged

batman

Serious Thumper

Offline

SuzukiSavage.com
Rocks!

Posts: 3806
osceola new york
Gender: male

Re: Big Bore Bobber Build
Reply #140 - 02/10/18 at 11:07:14

The main jet comes into play at 3/4 throttle. if the motor is going lean at 30 mph you need to be looking at the idle jet and the needle height . If your at WOT at 30 your 170 jet is making the motor to rich and it's bogging. (what happened to trying the 145 main?) jets are only 8-10 bucks apiece ,you need to brake down and buy some. with the elevation of El Paso being 3900 ft. your running much to rich! I'd go with stock idle jet (52.5) three # 4 washers on the needle (at least) and a 150 main jet as a good starting point. 28.34 mpg? Your bike is drowning !I'd be checking your oil,it could be that the level isn't going down (not normal with rings not fully seated )because it being replaced by gas washing down the cylinder walls! the bike is back firing because of all the raw gas being pushed into the hot exhaust header.

Back to top

my old work mates called me MacGyver

IP Logged

Christof13T

Full Member

Offline

SuzukiSavage.com
Rocks!

Posts: 211
Vicoria, Texas
Gender: male

Re: Big Bore Bobber Build
Reply #141 - 02/10/18 at 12:07:32

I tried the 145, then the 160, and then the 170...
I don't dilly dally. I have the bowl off and back on in 3-5 minutes...
The video of what it is doing is uploading to youtube now.
I have just blown out all the ports with compressed air with the carb in place, then pressured up through the fuel fill line port and worked the fluat. All is beautiful there. Put the bowl back on and hit it again to potentially blow any crud out of any ports with the system closed. Petcock is operating exactly as it is supposed.

I am at around 60ft above mean sea level here in victoria. ..
Peak at around 120ft...

Back to top

IP Logged

batman Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 3806 osceola new york Gender:	Re: Big Bore Bobber Build Reply #142 - 02/10/18 at 13:01:07 Sorry, it's Norm who's in El Paso ,my goof, but what I said about the gas in oil and raw gas in the exhaust still could be true.
Back to top	my old work mates called me MacGyver IP Logged

batman Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 3806 osceola new york Gender:	Re: Big Bore Bobber Build Reply #143 - 02/10/18 at 13:11:24 Chris , we know about your main jet ,but what are you running for the idle and spacer on the jet needle?
Back to top	my old work mates called me MacGyver IP Logged

Christof13T Full Member Offline SuzukiSavage.com Rocks! Posts: 211 Vicoria, Texas Gender:	Re: Big Bore Bobber Build Reply #144 - 02/10/18 at 13:12:30 OK so I put the 160 main jet back in it and put the larger pilot back in that came with the 6sigma kit... I also went ahead and pulled the slide and cleaned everything .. pulled the slide from the spare carb and cleaned it up... Put it in and put it all back together... Doing the same crap.
Back to top	IP Logged

Christof13T Full Member Offline SuzukiSavage.com Rocks! Posts: 211 Vicoria, Texas Gender:	Re: Big Bore Bobber Build Reply #145 - 02/10/18 at 13:14:56 1 of the tiny little flat washers and the white spacer. the slide I just put in it is bone stock untouched.
Back to top	IP Logged

batman Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 3806 osceola new york Gender:	Re: Big Bore Bobber Build Reply #146 - 02/10/18 at 13:18:13 Is there a cross reference between the sigma and stock jet or is it just a shot in the dark? jet needle spacer?
Back to top	my old work mates called me MacGyver IP Logged

batman

Serious Thumper

Offline

SuzukiSavage.com
Rocks!

Posts: 3806
osceola new york
Gender: male

Re: Big Bore Bobber Build
Reply #147 - 02/10/18 at 13:25:22

Chris , to raise the needle and get more fuel in the mid range ,you need to reduce the spacer, you need to either sand the spacer down, or replace it with 2 -3 washers . by adding the spacer and a washer your starving the mid range of fuel (that's why your plug shows lean) increasing your main jet won't help much if the needle isn't moving up enough. remove the spacer and put two washers(based on your 120ft elevation)in instead ,and see if your problems go away.I'd use the 145 main for now, but you'll end up using 150 ,152.5 later for WOT performance.

Back to top

my old work mates called me MacGyver

IP Logged

Christof13T

Full Member

Offline

SuzukiSavage.com
Rocks!

Posts: 211
Vicoria, Texas
Gender: male

Re: Big Bore Bobber Build
Reply #148 - 02/10/18 at 13:46:45

The video finally finished uploading...
This is what is was doing...

https://youtu.be/L_lxU2JgeyE

I pulled that cone filter off and put the pancake in its place at the end of the pvc pipe sticking out of that side of the elbow... made no other adjustment and tested it... some improvement but it still cut out around 35 in first under hard acceleration. at 45ish in 2nd.

came back to the house and turned the mix screw out anoher half turn...
tested it again and it now runs through all the gears under hard accel up into the 70's pretty easy...

WHAT GIVES!!???

Back to top

IP Logged

Christof13T

Full Member

Offline

SuzukiSavage.com
Rocks!

Posts: 211
Vicoria, Texas
Gender: male

Re: Big Bore Bobber Build
Reply #149 - 02/10/18 at 13:50:21

There was no cross reference offered...
It was a shot in the dark...
It had worked fine until yesterday lol.

I will pull it back apart and confirm what is in both slides and make an adjustment. It could ave a little more in the upper rpm band.
Could that cone filter have too little restriction to allow pressure to build up to work the slide?

Back to top

IP Logged