Tomos Jammer

So Ok, I've started using a Tomos Jammer and it's been pretty sick after giving it a slight amount of prep.

Setup is a35 bottom end, stuffy crank with c4 clearance bearings, 64cc airsal kit (no casematch), doppler er2 reed, MLM 15mm SHA intake, CDI with Parmakit box, 15mm SHA with a #75 jet and solid #2 metal slide, full mesh filter element with Minarelli Style Airbox, HUNTER PIPE, balanced 1st and 2nd gear, lathed clutch bell, 2nd gear has the $33 shoes with stock green spring 9.5lb spring. I'm running 26x24 gearing on a 3" knobby tire streetmate rear wheel. I'm hitting somewhere around 43-45mph, but in a REAL hurry.

I threw it into my bike with no prep and the lightest springs from the factory and it was OK. I was having some issues with erratic engagement so I pulled everything apart to take another look at what was going on.

First thing i noticed was that the bolt heads very lightly were hitting my clutch bell.

I added the shim that comes with the clutch, buttoned everything up and started to test. I was not very happy with how the transmission felt after that so I opened everything up again and took another look.

I decided to ditch the shim and take down the heads of the bolts that had been hitting the clutch bell previously. No problem here, just use a bench grinder and take them down the slightest bit until they are flush with the face of the hub.

Next, I noticed that 1 out of the 3 spots for shoes was a tighter than the others and wasn't allowing one of the shoes to engage easily. No problem here either, I grabbed a hand file and filed away the top and bottom plates that sandwich the hub until a clutch shoe had smooth, free movement.

I reassembled everything and greased the area on the hub where the shoes lock into and we were back in business.

Bike rips, absolute blast, love it. Great take off, blip shifts into second wonderfully. More than fast enough for a city ripper.

I'm still testing this with the lowest engagement RPM springs, but I think I'm going to open up my transmission tonight to see how things look and to toss in the middle RPM springs to see how the bike likes it.

Does anyone have any clutch spring recommendations other than what come with these stock?

I know the malossi ones for the puch jammer are like NEXT LEVEL compared to stock and was wondering if anyone had any leads!

I'll probably go picking through what we have any see if anything works myself, but I figured I'd start a thread about this sort of thing.

If anyone has cool and fun experiences with this clutch, feel free to post here. I'll be adding some pictures and stuff later once I tear my trans cover off.

Re: Tomos Jammer

It's just a simple plug and play with those clutches then? I mean the obvious stuff you did aside. No welding on anything for it to go into the bike tho?

I just grabbed a tighter spring for my stock gear. But if this gear eats it then I will look at the jammer for sure!

Re: Tomos Jammer

> Jay Rivett Wrote:

> -------------------------------------------------------

> It's just a simple plug and play with those clutches then? I mean the

> obvious stuff you did aside. No welding on anything for it to go into

> the bike tho?

>

> I just grabbed a tighter spring for my stock gear. But if this gear eats

> it then I will look at the jammer for sure!

I've always ground down the clutch bell a little bit to get the Jammer to fit, but aside from that you just slip it on

Re: Tomos Jammer

it's basically plug and play besides the mods I listed.

So last night, i went into my transmission to try out the heavier rate springs and see how everything looked/felt and i didn't take any pictures.

I was getting some vibration that I wasn't really liking and knew something had to be up in there. Turns out, I had shimmed my kickstart shaft a bit too much. I saw wear on both the shim and top circlip, so I swapped out for a thinner shim and all the vibration was gone...pretty tight. I bet my case cover bearings are almost smoked already from that shit though. Maybe next time i replace them, I'll try out a nice high grade 608 bearing instead of just whatever my local bearing shop sells me. The tiny little guy does spin 1:1 with the crank so like...it can't hurt to have a good bearing in there.

but ok, i put the medium 1.6mm thick springs in and they are just...OK. its not much better then with the 1.5mm thick springs. If i go WOT on take off, the bike revs higher for a second, then the RPMS drop down to about where the clutch engages with the 1.5mm springs and the bike takes off. If i go like 1/4 to 1/2 throttle on take off, the bike revs higher, holds the revs and the clutch engages without the RPM drop. Kinda crappy, not desirable in my opinon.

I'm gonna try out some scooter clutch springs and see if I have any success with them. I'll update this post with info as I find it.

My old first gear was those same $33 shoes from treats with the same 9.5lb green spring and it performed very well. It was only a little worse then the jammer with lightest rate springs.

anyways, thanks for coming to my ted talk.

Re: Tomos Jammer

Excellence. GORGEOUS.

Re: Tomos Jammer

update: i think the springs are breaking in & i like them more. i’m still gonna order some malossi springs & give them a shot

Re: Tomos Jammer

EH 📣FCC of the QCB /

I have found the heaviest that come with the clutch seem to work the best. I tried some GY6 ones yellow, blue and red and the ones it comes with have been better. I tried some red Malossi but that was way too much slip. Bike was set up with a treats kit ported like a Polini and BK100.

Re: Tomos Jammer

i’ve got the malossi springs on the way, i have a feeling the white ones are gonna fucking rock.

i will update when they arrive. & maybe also put some pictures in here

Re: Tomos Jammer

what's got you using doppler er2 reeds in place of airsal? just curious ?

Re: Tomos Jammer

EH 📣FCC of the QCB /

> LSLB RXb Wrote:

> -------------------------------------------------------

> i’ve got the malossi springs on the way, i have a feeling the white ones

> are gonna fucking rock.

>

> i will update when they arrive. & maybe also put some pictures in here

Rad let us know!

Re: Tomos Jammer

> Mark Alan Wrote:

> -------------------------------------------------------

> what's got you using doppler er2 reeds in place of airsal? just curious

> ?

So the MLM intake is just a circle that lines up PERFECT with the Doppler er2/er3 single reed.

My thoughts are less flow eddies, but it's not like I have a dyno and can really test.

Re: Tomos Jammer

got the springs. put them on. they are pretty good! better than what i had before for sure!

here are some pics.

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Re: Tomos Jammer

also, here are some pictures of my moped.

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Re: Tomos Jammer

EH 📣FCC of the QCB /

That seat is amazing!

Re: Tomos Jammer

it’s super long & made of plastic.

some sort of suzuki seat??

Re: Tomos Jammer

I thought it looked like it was off late 70s st/trail motorcycle.

Re: Tomos Jammer

Hepatitis J [OFMC] /

cool bike, homie

Re: Tomos Jammer

so ok, i’ll admit this isn’t jammer related, but does anyone else use pin gauges to mic their jets?

i’ve started & everything seems to read .01mm smaller then the size. like a 76 jet will be .75mm. but a different stamped 76 jet is .76mm. cool & fun stuff when you are tuning a sha where you have 1 jet.

next up, slide #9. it rocks. fully opens your sha. i went from being rich at a .74mm 75 jet on a #2 slide (same cutaway as a number #9 but longer) to like maybe a hair lean. i’m gonna try a .75mm 76 jet & i have a .76mm 76 jet to try next. pretty exciting

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Re: Tomos Jammer

the .75mm 76 jet was great with the #9 slide.

the .74mm 75 jet was a tiny bit lean with the #9 slide.

it’s crazy how much better the bike settles down to idle with the #9 versus the #2 on a WOT run. makes sense.

maybe the #2 slide is a break-in slide?

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Re: Tomos Jammer

I have identical setup on my tomos other than doppler reed . anyhow I cannot get my sha to run rich. I've tried #68-78 and still get the same behavior out of my 64cc a35 engine super warm but light plug chop

s. so I'm at a wtf moment. so I decided to turn stator off the top advance mark ccw a public hair to cool the engine slightly. because I've got zero airleaks runs strong low to mid to top all the way thruuu just stays on hot lean an flustered with it.

Re: Tomos Jammer

i’m also at sea level here in boston. anywhere with higher elevation will need larger jets than what i’m running.

what sort of airbox are you running? which slide are you running? what’s your mesh filter stack like?

i’m running one of those dellorto branded Minarelli/Garelli air boxes with the air inlet holes pointed towards my frame.

the slide, as previously mentioned is a #9.

the filter stack is completely stock, unmodified.

i use a tachometer to help tune, it lets me know how many rpms i’m revving to. i’m spinning right around 8500rpm at WOT.

Re: Tomos Jammer

Leave the airbox as it is and start pulling out screens from your filter pack. I usually leave 2 screens in and it makes the needed air flow while also stopping debris.

You can also notch your slide a little. I will take a pic of my notched slide and see if I can tell ya what number it is. I feel like it has a pretty steep ramp at the bottom of it.

Re: Tomos Jammer

> Jay Rivett Wrote:

> -------------------------------------------------------

> Leave the airbox as it is and start pulling out screens from your filter

> pack. I usually leave 2 screens in and it makes the needed air flow

> while also stopping debris.

>

> You can also notch your slide a little. I will take a pic of my notched

> slide and see if I can tell ya what number it is. I feel like it has a

> pretty steep ramp at the bottom of it.

if he wants to go richer, why would he do any of these things?

less screens = leaner

further slide cut away = leaner

Re: Tomos Jammer

cool & fun update.

i’ve replaced 2nd gear clutch pads & have gone back to the jammer with middle tightness stock springs.

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2nd gear locks up much nicer now. i was having issues getting into 2nd gear smoothly with the malossi white springs & i think it was all just my 2nd gear shoes. i’m gonna have to swap back to the white springs just to check, but the bike is severely as is now.

i also added an adhesive neodymium magnet to the bottom of my clutch cover. it works great!

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Re: Tomos Jammer

EH 📣FCC of the QCB /

Nice! I indented a grove inside my ZA50 cases and epoxied and magnet to it and it worked well too. I definitely liked all the small shavings it would pick up.

Re: Tomos Jammer

yup i went back to the white jammer springs. my clutch cover gasket finally broke, so i replaced it and i reshimmed my intermediary gear. this bike now absolutely fucking rocks.

the best part is that it’s all bolt on parts. no case match, no porting, nothing whacky or wild outside of getting the gears lathed down, which you 100% don’t really need to do unless you have a homie with a lathe.

Re: Tomos Jammer

Thanks for sharing your experience with the GY6 springs. I like the jammer as well, used it on both my 45mm alukit with both the light and medium springs, and the current 47mm Gilardoni setup with both the medium and heavy. Currently using the heavy springs it comes with, but feels like it wants more. I want to could get rid of at least some of the lag when it shifts to second and comes off the pipe, since it fully engages around 5500 with the stiffest springs and I really need closer to 7k for optimum performance with my pipe and jug combo.

Gonna try the white GY6 springs next.

If you have a tach, can you guess about what RPM they fully engage?

Re: Tomos Jammer

i’ve gone back to the middle rate springs that came with the clutch. the engagement was too erratic & was giving me problems getting into 2nd gear.

i would say that you should get those malossi springs & you’ll 100% find something that works. the whites are probably engaging at like 6500rpm & they are the lowest strength in that pack. if i made more rpms, i would probably like the white springs more.

all of this really makes me long for a 2nd gear with easily tunable springs like the jammer to play with. maybe some day

Re: Tomos Jammer

> LSLB RXb Wrote:

> -------------------------------------------------------

> i’ve gone back to the middle rate springs that came with the clutch. the

> engagement was too erratic & was giving me problems getting into 2nd

> gear.

>

> i would say that you should get those malossi springs & you’ll 100% find

> something that works. the whites are probably engaging at like 6500rpm &

> they are the lowest strength in that pack. if i made more rpms, i would

> probably like the white springs more.

>

> all of this really makes me long for a 2nd gear with easily tunable

> springs like the jammer to play with. maybe some day

Yea something like the Stage6 tuneable clutch would be dope.

I have the pack of malossi springs with white/red/yellow on the way, along with an 8p Stage6 reed to replace the 4p Malossi VL6. Will try white springs first and see how it likes it - another 1k later RPM would be almost perfect, which sounds like it would be the white springs.

This thing is gonna be a rocket once I get that shift RPM drop taken care of. (edited)

Re: Tomos Jammer

> LSLB RXb Wrote:

> -------------------------------------------------------

> i’ve gone back to the middle rate springs that came with the clutch. the

> engagement was too erratic & was giving me problems getting into 2nd

> gear.

>

> i would say that you should get those malossi springs & you’ll 100% find

> something that works. the whites are probably engaging at like 6500rpm &

> they are the lowest strength in that pack. if i made more rpms, i would

> probably like the white springs more.

>

> all of this really makes me long for a 2nd gear with easily tunable

> springs like the jammer to play with. maybe some day

Just wanted to come back and say huge thanks for the Malossi spring tip. They are AMAZING. The white springs almost completely eliminated the bog shifting into 2nd, and now it only dips to 6300ish rpm after shifting instead of 5500, so you were very close with your guess of 6500. Going to test the yellow springs but they might be too much for normal riding, its already pretty close to an on/off switch for power delivery and doesnt like going much under 30mph. I am very close to being able to always be on the pipe at WOT, which is a ton of fun.

Bike is a monster, power wheelies even with the extended wheelbase and extra rake. Had it up to 65 already but think it can do 75. Might get a video this weekend.

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