dubSolo's re-Build and other...
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wow.. that's cool.. how long you make it ?
i mean you do it just your self, may be need more time
i mean you do it just your self, may be need more time
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1,123 Posts
Not to sure what you mean? Thank you though...
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820 Posts
What does that mean?
What made you try the Yoshimura cam for a while? The DCR is way faster I bet?
I will use those GFz studs on a Neo 181 build, if I ever go through with it.
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1,123 Posts
There's this order I've always kept of members I've grown to communicate with for advice since membership.
I consider them Grom Gurus...
estallings was the last Guru added to this list. I always joke with him on how his stock is rising (this guy is awesome). Recently my No.1 is no longer part of the grom scene.
So just to fuck with estallings I made M.S.A.
On the cam I wanted to experiment with how much bottom end I would gain with the least amount of top end loss. Happen to come across Koso and Yosh1 cam fairly cheap on FB a day apart.
Gave the Koso a few days... To me did not seem to much better than stock cam just stronger. Valve clearance is even the same as stock.
Compared to DCR at 9rpm can smash the throttle and DCR will pull every bit of 11/12rpm no problem...
Koso smash that at 9rpm it struggles to quickly get up to 10+rpm.
Yosh1 ran for idk 2 months maybe... That made the Grom a beast all the way to 10+rpm improvement everywhere can maintain steam. But to much of a hit on my top speed
I consider them Grom Gurus...
estallings was the last Guru added to this list. I always joke with him on how his stock is rising (this guy is awesome). Recently my No.1 is no longer part of the grom scene.
So just to fuck with estallings I made M.S.A.
On the cam I wanted to experiment with how much bottom end I would gain with the least amount of top end loss. Happen to come across Koso and Yosh1 cam fairly cheap on FB a day apart.
Gave the Koso a few days... To me did not seem to much better than stock cam just stronger. Valve clearance is even the same as stock.
Compared to DCR at 9rpm can smash the throttle and DCR will pull every bit of 11/12rpm no problem...
Koso smash that at 9rpm it struggles to quickly get up to 10+rpm.
Yosh1 ran for idk 2 months maybe... That made the Grom a beast all the way to 10+rpm improvement everywhere can maintain steam. But to much of a hit on my top speed
I reread the thread trying to find some info on your setup, would you mind posting your power mods? Or at the very least, piston, head, throttle body and gearing? Or everything would be great.
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820 Posts
I see. Nice. Well, I’ll probably never make the list, but maybe I could get a participation trophy, since you and I communicate sometimes?
lol.That DCR2 Pro sounds like a beast. It would be cool if someone had tried both the DCR2 Pro and the Yoshimura ST-2M. I would love to know how those stack up. I’m always curious if the Yosh gives up much to the DCR.
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1,123 Posts
Shit... your right my bad lol
Dhm: piston, race head, intake with Dcr2 cam on ported stock tb and hindle exhaust
GFz: header gasket, cam cover, cam chain tensioner and speed spacers with HD studs ready for bbk
aRacer: full mini5 tuner set-up (Sweet spot for timing and afr is Key)
Takegawa: ignition coil, cam chain arm, oil pump and fourth bearing support
JC Racing: lighten flywheel and oil spinner
SMR 6plate and 60% springs
And a few simple weight reductions here and there...
No doubt you Ninelives and Phoenix get at least participation trophys if not honorable mentionI see. Nice. Well, I’ll probably never make the list, but maybe I could get a participation trophy, since you and I communicate sometimes?
That DCR2 Pro sounds like a beast. It would be cool if someone had tried both the DCR2 Pro and the Yoshimura ST-2M. I would love to know how those stack up. I’m always curious if the Yosh gives up much to the DCR.
Dcr is definitley a monster... sucks Farkas is not active on the chart anymore.
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8,369 Posts
The original DCR cam worked on the BrianS 170 BBK kit back in 2014-15 time frame and it even worked better on the Finbro 183-2v BBK kit which is no longer sold by HR.
the other setup I did with this cam installed was also using the duel valve spring setup.
With all the pass experience I had with 2V kits I bet I can make the 170-181-2V engine scream with my DIY porting and tricks I learned on my 4v engines.
the other setup I did with this cam installed was also using the duel valve spring setup.
With all the pass experience I had with 2V kits I bet I can make the 170-181-2V engine scream with my DIY porting and tricks I learned on my 4v engines.
Who did you get your head from?
What size valves? Any additional porting or right out of the box?
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1,123 Posts
Hoping to build a reliable little powerhouse, no doubt all the port work will help. Just got Koso tb sending that out to be ported and still have to get that damn brass screw lol.
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1,123 Posts
David at Dhm did all the port work: full race port and deck, valves 26.5 / 22.5, dual valve springs on intake side with ti retainers...
David cut the valve guide out of the port and epoxy raised the floor to keep the velocity up since Im using stock tb.
Do you or David feel the stock throttle body is holding you back any? What is your top speed? Sorry for all the questions, seriously considering a hi-comp piston and ported head.
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820 Posts
Why don’t they just include that stupid freakin’ screw? I can’t tell you how many threads I’ve read, where someone’s bike was running like total crap. They’ve tried everything they can think of to make the bike run correctly, then someone’s asks if they installed the brass screw! Totally unnecessary. Just include the screw with the throttle body!
Since it looks like it’s open season to hammer dubSolo with questions...haha, is David porting the Koso throttle body too?
I would like to have my stock throttle body taper bored. I’ve seen some that don’t look like someone took a dremel to them. They look like they have been machined. Is someone able to machine them somehow, like on a lathe?
Why 2 valve instead of 4 valve? Probably because you already have that nice head. I’m a 2 valve fan.
We can talk about whatever we like in this thread, because it says, “and other shit...”.
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8,369 Posts
Yep port matching is another Grom secret, matching the I/D of the intake tube and also the exhaust pipe to the head.
Another trick is to port/polish the intake tube OEM or Koso or what every and take the throttle body and polish the under side where the butterfly valve is and also polish the butterfly valve.
Biggest cheapest gain is the 4th bearing support with the Koso cam chain arm and sprocket gear and using GFZ adjustable cam chain unit or who ever designs the adjustable cam chain unit.
Another trick is to port/polish the intake tube OEM or Koso or what every and take the throttle body and polish the under side where the butterfly valve is and also polish the butterfly valve.
Biggest cheapest gain is the 4th bearing support with the Koso cam chain arm and sprocket gear and using GFZ adjustable cam chain unit or who ever designs the adjustable cam chain unit.
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1,123 Posts
Cant speak for David but yes the stock tb is definitely holding me back on top end HP and speed...
With current aRacer and old Dj set-up have not been able to break 85mph mark.
Im sure if I were to swap the stock tb with the koso I would gain, but waiting for bbk to do all at once.
Would definitley be nice, charge an extra $15 to include as a kit with tb.
Sending to Guru No.3 lol, Have an experiment he wants to give a go pertaining to Koso manifold and spacer.
Gromfatherz is the only one that I know of that uses machine method. Dhm, Cjr, Jc Racing and Staightup pumps all offer TB porting... Check out Straight up pumps though for the price and he adds countersunk screws to butterfly its a good deal.
Ported/Countersunk stock throttle body
Only for 2013-2020 Groms(OG & SF)/MSX/Monkeys Velocity ported and counter sunk OEM throttle body provides the best flow possible! Notice there are no screw heads blocking air flow or creating turbulence that robs your motors power! No one else currently offers this complete of a throttle body...
straightuppumps.com
Correct since I already have the head, was on Davids suggestion to go Koso 170 he said they would pair great together. Will be sending him the koso piston to make valve reliefs bigger for valve clearance, if they dont already clear David doesnt think it will be an issue... but have back up plan just in case. Sticking with 2V because I dont want to have to split the case and trying to avoid crank failure... Was told the 170 kit can be a monster if I get up towards 18 to 22 hp may have crank problems regardless... At that point would be proud to upgrade crank
Thats right can discuss whateverTF we want in my thread which falls under the "and other shit" lol
Just so you know CJR has a great deal on the Koso TB and manifold.... you should check it out.
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