SuzukiSavage.com - 2013 S40 budget Scrambler Build

TBR125 YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 41	Re: 2013 S40 budget Scrambler Build Reply #30 - 01/02/22 at 19:19:36 I checked the tension of the full swing-arm range with the suspension removed and the concept seems to work. I'd fabricate it with an idler pulley suspended from the swing-arm bolt.
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ohiomoto Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 2681 WTF is JOG?	Re: 2013 S40 budget Scrambler Build Reply #31 - 01/02/22 at 19:23:09 Chain rollers that do what you desire are common on motocross bikes.
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TBR125 YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 41	Re: 2013 S40 budget Scrambler Build Reply #32 - 01/02/22 at 19:32:56 Thanks, I assume the same concept would apply for a belt?
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Re: 2013 S40 budget Scrambler Build
Reply #33 - 01/03/22 at 03:08:02

My motocross bike back in the 70's had a little rubber wheel and tensioner that was in constant contact with the chain to control slack. It worked fine but it had to be replaced occasionally as it wore - I have no idea how many miles it lasted - however I would guess that an average speed of 15 miles an hour and a top speed of 60mph on a 125cc dirt bike is a reasonable guess (My BMW street bike keeps track of my average speed and it is only 38 mph, as the stop signs and rural road riding all take a toll on the average).

I have never been a fan of "idler pulleys" on a street driven motorcycle. Asking a skate board wheel to hold up on a motorcycle that is going to be ridden at highway speeds is asking a lot of the tiny wheels that are designed to operate at far lower speeds. The tiny wheels and even smaller bearings are going to be spinning really fast! You see these little idler wheels used on a lot of bobbers, choppers and show bikes - but how many of these bikes get any miles put on them? I try to keep modifications reliable and not be prone to failing when I am far from home.....when we are on rides in TN/NC/GA/AZ I don't want to have a failure that gets me stranded along the side of the road.

If you have to use an idler I would not intentionally design it to be in contact with the belt or chain continually - it would be better if it only spun during the points of extreme swing arm travel (up or down). That way it will only be working part time and not spinning like mad when you are going 60mph or more down the highway. That roller that OhioMoto showed is likely only in contact during the period the shocks are fully extended and as the shocks compress the contact is less.

And if you do use an idler and actually ride the bike far from home - take a spare idler and a wrench! Wink

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Re: 2013 S40 budget Scrambler Build
Reply #34 - 01/08/22 at 15:25:29

TBR125 wrote on 01/02/22 at 19:32:56:

Thanks, I assume the same concept would apply for a belt?

Yes, Buell used an idler pulley on their XB-series bikes, worked really well on them. XB9, XB12, and Ulysses. I’m sure you’ll be able to find photos online.

EDIT: go to the link below, scroll to message #108. You can clearly see the factory supplied idler pulley. These are street bikes with a LOT more power than a Savage would ever have, and the idlers are generally not a problem.

https://advrider.com/f/threads/buell-ulysses-drive-belt-life.546118/page-6

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TBR125 YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 41	Re: 2013 S40 budget Scrambler Build Reply #35 - 01/09/22 at 11:42:48 Thanks.
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Re: 2013 S40 budget Scrambler Build
Reply #36 - 02/15/22 at 09:17:57

Finally several months later, enough progress has been made for an update.

The top triple clamp has been roughed out with a burr and will be finished during final fitting. The 4in1 brand 3.4 gallon E-bay tank fits well with plenty of clearance under the bars with 4 inches of rise and 2 inch mounts. I will be cutting the seat narrower and bending the sub-frame once I finish the backing plates for the mid mount controls.

What intake manifolds are you guys using for the VM36 carb? The stock is a 40mm I think.

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TBR125 YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 41	Re: 2013 S40 budget Scrambler Build Reply #37 - 02/15/22 at 09:19:38 And the quick grind for the lower triple clamp conversion. The steering tube hole looks off center but that is just the picture angle
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TBR125 YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 41	Re: 2013 S40 budget Scrambler Build Reply #38 - 02/15/22 at 09:20:33 Pic 2
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Edub Full Member Offline SuzukiSavage.com Rocks! Posts: 160 Arizona Gender:	Re: 2013 S40 budget Scrambler Build Reply #39 - 02/20/22 at 00:18:11 Looking good, TBR125! Did you end up solving the belt tensioner dilemma?
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LANCER Serious Thumper Alliance Member Offline Savage Beast Performance Parts Posts: 10586 Oklahoma Gender:	Re: 2013 S40 budget Scrambler Build Reply #40 - 02/21/22 at 17:53:26 For the VM 36 round slide carb start with a #20 pilot and a #200 main jet, with the needle clip on the middle (3rd) groove; fine tune from there. You asked about the intake used...are you referring to the rubber mounting flange ? If so, you will need: Mikuni part # M-VM-36-200K or Sudco part # 002-054 Retail: ~ $35
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TBR125 YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 41	Re: 2013 S40 budget Scrambler Build Reply #41 - 02/22/22 at 22:18:48 Edub wrote on 02/20/22 at 00:18:11: Looking good, TBR125! Did you end up solving the belt tensioner dilemma? Thanks. Yes, I'm still working on the dimensions though to work it into the mid set control unit bracket.
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Re: 2013 S40 budget Scrambler Build
Reply #42 - 02/22/22 at 22:24:52

LANCER wrote on 02/21/22 at 17:53:26:

For the VM 36 round slide carb start with a #20 pilot and a #200 main jet, with the needle clip on the middle (3rd) groove; fine tune from there.

You asked about the intake used...are you referring to the rubber mounting flange ? If so, you will need:
Mikuni part # M-VM-36-200K or
Sudco part # 002-054
Retail: ~ $35

Thanks. That is what I was looking for. Would you recommend using the Thunder performance UFO, does it make a noticeable difference? I was given one left over from a snowmobile build.

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Re: 2013 S40 budget Scrambler Build
Reply #43 - 02/23/22 at 07:58:30

TBR125 wrote on 02/22/22 at 22:24:52:

LANCER wrote on 02/21/22 at 17:53:26:

For the VM 36 round slide carb start with a #20 pilot and a #200 main jet, with the needle clip on the middle (3rd) groove; fine tune from there.

You asked about the intake used...are you referring to the rubber mounting flange ? If so, you will need:
Mikuni part # M-VM-36-200K or
Sudco part # 002-054
Retail: ~ $35

Thanks. That is what I was looking for. Would you recommend using the Thunder performance UFO, does it make a noticeable difference? I was given one left over from a snowmobile build.

I like the UFO, when properly installed and tuned it will improve low-mid throttle range performance, although the jetting and tuning is a bit more involved. You will need to change the needle jet along with pilot and main jet adjustments.
Also, the UFO’s made for the VM carbs on snowmobiles is different in shape to the newer UFO’s made for the carb we use (VM36-4). If that is the carb you have then you will need the UFO 3638-1.
If you have questions on installation PM me.

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