1.3 ratio rockers versus 1.1 ratio on a Duromax 208

1.3 ratio rockers versus 1.1 ratio on a Duromax 208
Did some top speed and zero to thirty runs with the DuroMax 208 powered Bonanza mini bike with 1.1 ratio rocker arms. Swapped the 1.1 ratio rocker arms out for a set of 1.3 ratio rocker arms and did the same speed test to see if there was any difference in performance.
Instagram - Doubledown555Black66
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Parts used -
1.3 Ratio rocker arms www.studzracing.com/product-p...
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[@mlindsay527]

Excellent content, keep it coming!

[@1LN]

Man what a small world, I'm watching your videos, because I want to build my son a minibike, and BAMM it hit me, you are ripping around my sons Jr High, I will need to keep a lookout for you, and maybe we can shoot the shit about a bike, keep them videos coming!!

[@domturiace670]

You would be the best neighbor ever. More obsessed with minibikes then me lol

[@EJ-74]

Cool comparison Not the outcome I expected but still good to know. 👍 I subscribed. Love the content 🔥 I Commented on one of your older vids not realizing it. lol It popped up recommended after watching Cars & Cameras latest vid. lol ✌️

[@Entertainment_Enterprise]

You could Un-sink the Titanic with that Valve float.

[@Black66]

LOL now that's some serious float ! 😀👍

[@johnk6346]

Keep putting out good info

[@fortniteman4642]

You should do a video on the realtree rt200 i wonder what you would to it.

[@NubsWithGuns]

I've been reading that some don't put the ratio on the exhaust side. I don't get why or when one might do so.

[@SDS-1]

Love the vids man......😊😊😊

[@Black66]

Thanks!

[@SDS-1]

@@Black66 thank u sir

[@Tyler-xh2sg]

Could you please recommend me some rockers that would fit on a Tillotson 212 Stage 2? Not top of the line, but an upgrade over stock. The stock valve nuts keep stripping.

[@jerrid1983]

Timing advance with those rockers maybe?

[@jamesgravel7755]

I just put on some 1.3’s with 28lb springs I really didn’t notice a difference. I had to dremal out my guid plates to get them to work. The aluminum flywheel was a good increase. The .080 key way was a nice bump. The tillotson carb was a huge bump. But the 1.3’s. Not so much. Stock Coleman ct200u 196. Stock gears 42mph. But it gets there fast. Need to do a 0 to 30 and see if I’m close to black66.

[@thomassims2679]

Hey, mr black, what fuel do you put in your bikes?

[@tonyalto1014]

Hmm, I wonder if the replacement flywheel has different ignition timing (keyway cut at a different spot in relation to the magnet). Just a thought.

[@Black66]

It runs really well with this flywheel and 1.1 springs. It's a DuroMax rocket ship ! 😀. I think it could use some 22's with the 1.3's

[@6628guitarhero]

​@@Black66video idea.. test the 1.3 on just the intake and then test it on just the exhaust.

[@Chr0meharts]

are you going to change the springs out and do another top speed test?

[@Black66]

Yes, I have more videos coming with this bike

[@buckcramer981]

What app do you use for your speed

[@k3_Clipz3]

My 18lbs springs also floated, but you should try your 1.3’s wit stock springs

[@NONAME-kw3pu]

floated at what rpms??? 6000? almost fast enough with stock rod. 22# for 6500 per ARCracing description of the 22# springs

[@Spacecruizer203]

B..E..A..U..EeeeeeeaasST!!! Beast

[@Black66]

YES!

[@mlindsay527]

How about comparing weights and 0-30’s on various flywheels?

[@Black66]

I have a video on that topic. Ill put it out there pretty soon.

[@x00xero00x]

I have an off topic question, I bought a nibbi carburetor and was wondering if you could let me know where to start with jets for tuning? It is going on a tillotson 225.

[@Black66]

I think I ended up with 120 main and a 35 pilot on the 224 but you might be different with different altitude, engine mods, etc.

[@x00xero00x]

@@Black66 I'm at sea level, but it is a starting spot. Better than what came with the carb.

[@jojojeep1]

Hey buddy how you doing it’s Joey, weren’t you supposed to change out the push rod plate when you put those rockers in?

[@Black66]

It needs the guide plate with the stamped rockers. If I would have had roller rockers I could have got rid of the plate. Thanks for watching!

[@jojojeep1]

@@Black66 No problem, like I said thanks for responding you always respond so quickly

[@jojojeep1]

@@Black66 Hey bud, I hate to bother you I have a 212 predator with a mile build anyway it runs perfect, I took the spark plug out and replaced it with one of them auto light racing plugs that these guys put in there 212 and the idle is really high now could the spark plug have anything to do with that? Thank you

[@bradcarpenter2396]

Hey Black, my 196cc with a mikuni 22mm is running very rich, is that the adjustment on the bottom of the carb? Thanks...

[@Black66]

Check out this video kzbin.info/www/bejne/g5-0p3yie71rnq8

[@NightmareFTW1]

you should fully build a 212 predator with a 310 cam

[@NONAME-kw3pu]

.350" lift is the most that does any good per an article i read online.

[@palanskisimmons]

What kind of camera you use it's HD certified 🤔

[@Black66]

Yes, it will shoot 4k. Hero 7

[@billbalke7572]

When you increase lift you increase airflow there for you will be running lean

[@bradcarpenter2396]

Hi Black66, how long of a strip do you test on, 1/4 1/8 3/4 mile??? Please let me know.

[@Black66]

Its about 1/4 mile

[@bradcarpenter2396]

@@Black66 thanks big guy.

[@thefishingchannel3192]

Hey, you should try different racing fuels. I converted my stuff to e85 because gas is getting up there In price haha. I actually gained low end speed and didn't seem to effect top speed. Just something I thought might be worth looking into ✌🏼

[@ltprecision888]

When you say "converted them to" what exactly do you mean?

[@thefishingchannel3192]

@@ltprecision888 I replaced most of the fuel lines with some that can withstand e85. I also replaced other things but I can't remember what all I did. (I did it a while back)

[@ltprecision888]

@@thefishingchannel3192 E85 carries 76,330 BTU/gal. Normal 87 octane around 116,090 BTU/gal. Meaning e85 carries less energy per combustion cycle as compared to regular unleaded. Unless you're wanting to run a fuel pump to get the same amount of energy than you would compared to an ethanol free I don't see a benefit.

[@thefishingchannel3192]

@@ltprecision888 I see... I might have to compare types of gas and see the benefits. I probably will start running ethanol free in my race engines. Thanks for your time ✌🏼

[@thefishingchannel3192]

@@ltprecision888 if I had to guess why I saw an increase in torque. It is probably due to the small amount water in the e85 or something such as that. I'll have to do more research on that.

[@MrDirtySolja]

When you torqued the flywheel what held it steady?

[@Black66]

I made a flywheel tool out of an old clutch. I show it in this video...kzbin.info/www/bejne/op6Zq4esna97ic0

[@MrDirtySolja]

@@Black66 thanks I found a kit plate adapter from omb I think

[@MrDirtySolja]

@@Black66 got some gage 1:3 ratio rocker arms and 5.110 push rods. Motor is stock 212 non hemi predator. Can I just put em in or will I need to upgrade elsewhere

[@carnivorecave]

22 Springs and carb tune...

[@scorpioslab]

I rewired my Duromax XP 7 HP electric start. After wiring, and running I realized there is 2 wires coming from the charging coil. The one I missed is a black wire with a white strip. Any idea what that wire is?

[@fololoco6420]

You only need 4 out of the 6 wires connected to the duromax starter,

[@scorpioslab]

@@fololoco6420 I resolved it. I forgot when I snipped the oil level wire. It was hanging my the stator. It just feel there. It was a dee dee moment. It's all good. Thanks though man.

[@fololoco6420]

@@scorpioslab did u upgrade internals yet? I have a duromax 7hp and I’m not sure what size rod i should put in there

[@scorpioslab]

@@fololoco6420 yep main power, starter, coil, kill. I did add a direct negative though t from the headlight to the negative terminal of I want to hook up anything inline like a horn.

[@scorpioslab]

@@fololoco6420 I used a trailer wiring harness 5 pin for a quick connect

[@Strict30]

Yup limited by spring pressure

[@NONAME-kw3pu]

and port the head. leaving 2 hp on the table without porting the head

[@mlindsay527]

Rods die from oil starvation that happens with extended high RPM runs. With your 0-30’s and short duration too speed runs, a stock rod should last a long time…

[@grampysgarage7527]

Bet 22lb springs will give you an increase in top speed. Sure sounds like valve float to me.

[@Black66]

Yes, I think so too

[@jerryleejr5594]

Take the 1.3 off the exhaust only run it on the intake. You’re probably coil binding the exhaust

[@Black66]

Thanks! I check for coil bind on every build. Check out the playlist. Thanks for watching!

[@jerryleejr5594]

@@Black66 as a motor builder for many go karts around Ca with 1.3 ratio rocker on the intake side only is 30% more lift. Coil bind just turning a motor over vs under a load is different. We run red strip 10.8 springs at .850 and shim the install height to .615 and run a mod 2 cam and turn 8,200 before valve float. The exhaust is the first one to bind or float but what do I know 😂

[@Black66]

There was no problem with coil bind, at least on this build . Thank you for your expertise. It's good having knowledgeable people with experience watching the channel! Even though everyone's experience is different It helps the community. We raced karts for many years down in So Cal. Peris raceway Corona, Elsinore, Adams kart track to name a few. Its cool to have people from the community on the channel. Thanks for watching!

[@NONAME-kw3pu]

like SBC put 1.6 on intake and 1.5 on exhaust. exhaust is under pressure so it flows well enough. intake only has air pressure to move the air/fuel.

[@mymodel6]

Surely you mean 1.3:1 vs 1:1...

[@Black66]

Check out the Azusa playlist . I show exactly what I mean. Thanks for watching! kzbin.info/www/bejne/hmGve2urmLKrgM0

[@NONAME-kw3pu]

125 @ 3700 ft? since not everyone is at 50 ft above sea level... 14.7 PSI air pressure. at 3500 ft.... its 13 PSI air pressure. less O2 needs LESS gas , NO MORE. harleys backfiring here when off throttle as... u put a Pipe on it U GOT TO PUT ON A BIGGER JET... yes, maybe at SEA LEVEL... NOT at 3555 ft as there is less air. just wastes gas and pollutes with raw gas being run out the tailpipe

[@buildingsbeginnings]

Air fuel ratio.. its a ratio that has to be maintained, regardless of altitude.

[@Deucealive75]

If the plug says you are running lean, you are running lean no matter what the altitude.

[@davidjernigan8161]

I'm going to keep modding this engine until it blows up like a Russian tank.

[@Black66]

YES!! lol I want to keep modding the outside until the insides come out...😂👍

[@oldhillbillybuckkowalski]

I'm gonna stop when I have to tow it home with a John Deere tractor.

[@NONAME-kw3pu]

if modded right... it will run out of HP at 6989 rpms anyway so why spin it any more than that? just a waste of motor overstressing it.