Checking Squish Clearance : Two-Stroke Scooter Help

A video explaining how to check squish clearance in a two-stroke scooter, why it needs to be checked, and ways to adjust squish clearance.
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#Squish #TwoStroke #Performance

[@jmrico1979]

Nice work dude. Simple and straight to the point, no talking nonsense for ages and no stupid soundtrack. Thumbs up.

[@TheJamminjeff]

i would recommend that when you use the solder method that you remove the head and lay the solder front to back,across the piston> checking it the above way will give you measurement error with piston rock! also turning the motor over,even with a kick starter can hurt the rod bearing..molding clay of course is the old way ,but also safe way,solder is great in that you can check its variables across the squish band rotate the motor with the crank !!

[@SnikendeUlteppe]

wow, This was actually much simpler to do than i thought! Awesome video dude! :)

[@henz993]

Very useful video and instruction. Thanks for sharing!

[@BSMARSBSMARS]

Best explanation on youtube.

[@powerking73]

Very nicely done! Kudos!

[@Jerkwaad]

I thought I was an "amateur expert" on small motors, but I've never heard the term "Squish C." before. This was an interesting video. I've sometimes lowered head space on older mopeds, in order to increase compression, by sanding it, by attaching sandpaper to a flat window.

[@acidangelster]

Cheers......thank u so much helped a lot.

[@wolfazar]

Very Well Done :)

[@CafeBikeGirl]

It affects timing when changing the thickness of the base gasket or shim because the entire cylinder and cylinder head are moved farther or closer from the rotational axis of the crank shaft. Changing the clearance by milling the surface of the head or using a different thickness head gasket the cylinder is not moved and port timing is not altered.

[@stevecameron85]

i actually used the stock crank and it went very well- bikes still running but i sold it-- now i got a pre bug zuma that im going all out on

[@patrickb.mxer2184]

This method also works on 2 stroke dirtbikes.just had my cr 250 done after I had ridden 2 bikes that already had it done and the difference is easily noticable.it only cost me around $100 including new gaskets.

[@mekanikch]

succes brother

[@CafeBikeGirl]

Also small squish clearance is critical to engine efficiency, as the pressure created mixes the fuel with air and pushes it towards the spark plug. So it is better to run the smallest squish clearance recommended for your intended use. If the engine knocks at that clearance increasing the combustion chamber volume at TDC can eliminate the knock while maintaining the efficiency created by the squish.

[@80Loke]

good video :)

[@Afuralfachir]

You the best

[@terjee648]

on my 70cc racing cylinders are there 0.55-0.6mm , but it is not normal and set the squish though it is not a racing cylinder often . when buying a cylinder with a piston and it comes with 1 bottom seal so it should fit , but it comes with several base gaskets must be set for a user manual but it's fine and see the piston does not come for now close to the top. Remember also piston ring gap 0.15mm feeler gauge when buying a new cylinder , also tighten the bolts with a torque wrench by about 1.2 kgm at 70-100cc . I have 4 manuals here , TPR 86cc 0.8-1mm , Malossi MHR replica 70cc says nothing about the topic , MHR 70cc 0:55 , Malossi MHR 95cc 0.55mm. two stroke !

[@DIOSpeedDemon]

Excellent video. Thank you. RH DSD

[@49ccscoot]

Thank you!

[@stevecameron85]

hey friend, steve with the 08 vento triton-expansion exhaust, keli variator, 2k springs, 53mph- i was wondering what type of performance the stock 100cc long cased minareli engines are good for? top end and such, thanks- your inspiring the hell out of me with these videos

[@stevecameron85]

hello friend- i made the decision, converting my little 50cc 08 vento triton to a 70cc liquid cooled monster!- ordered a pump from motoforce 12v electric- also got a radiator for a rm 85- looking at cylinder kits now

[@robertpierce1981]

Your videos, and your narration, have changed a lot since this one was made.

[@52styfler]

I have a yamaha bws 100 cc need to know how to modify the cindro, cylinder head, clutch, and the crankshaft. an induction please thanks. from Colombia

[@jaimeferreyra4526]

very good videos... have a question.. have a scooter 49 cc that start but shut down right away, i put a hose directly from the tank to the carburetor thinking that would be the gas regulator, but still the same, the carburetor is seal and have a spark so in your experience what do you think could be the problem and also have good compression.

[@49ccscoot]

Clean the carburetor.. Use compressed air and carb cleaner in every passage. Make sure the jets are clear. Check float height.

[@hendranurdiansyah3362]

how this master degree squish? may I ask for the details? thanks in advance

[@CentralValleyForum]

How does the squish clearance effect a 2 stroke timing? Doesn't it effect compression?

[@jmrico1979]

any advice for a 100cc 2t that measured 130 psi, and after a rebuild it reads the exact same 130 psi? tech manual calls for 170, cylinder, piston, rings, gasket kit and head are all stock. i'm puzzled wtf is going on here?

[@ipray4yousmc]

Do you use the copper spray on both gaskets on the 1E40qmb when upgrade

[@49ccscoot]

+marc I just use it on the head gasket, but some people spray the base with copper.

[@miguelilagan9703]

hi question here, if you remove the head and barel gasket to adjust the squish band, it will increase the height of the piston hence decreasing the squish band right? now, do you need to grind the piston to match the combustion chamber curve? cuz if you increase the piston height it will hit the cylinder head right? thanks in advance!

[@49ccscoot]

You have to maintain a minimum squish clearance so you don't have piston and head contact at any point. Removing gaskets will narrow squish clearance, the clearance between the head and piston. The squish band is usually referred to as the section of the head that mimics the piston crown angle, along the edges of the combustion chamber. Heads or pistons could be modified for a closer match of those angles, but in most cases for me it hasn't been necessary. Sorry the reply took so long, your comment was marked as spam for some reason.

[@ipray4yousmc]

When you tighting it did you use a torque wrench what was it set to

[@49ccscoot]

+marc 10-15ft-lbs.

[@zizo0]

what if the piston dont get the max high (about 3mm down the edge)?? whats te solution

[@49ccscoot]

You'll have to figure out what can be changed to improve the situation. Thinner gaskets, wrong cylinder, decking the cylinder, modifying the head, piston with a different compression height for a few ideas.

[@miguelgarlev]

hey m8! i have a derbi senda! euro 2 engine! and i have a problem witch is that i have la way to much squish clearance i mean like it dosent even squash the little piece o weir... please responde :)

[@tacticalwarfare8413]

Can you weld the combustion chamber for more compression

[@49ccscoot]

You could weld and machine a combustion chamber to lower the volume and increase compression.

[@jmrico1979]

clearance using the solder method is 1,6mm

[@neftalilopez4834]

i have a 2 stroke 50cc dont start got good spark and gas flow i remove the cylinder out but looks good but the rings are to loose can you help me out thanks a lot

[@49ccscoot]

+neftali lopez Check your compression or if you already know the rings are bad, replace them. Before spending the money on rings, you may want to find a service manual and inspect the piston and cylinder as well.

[@neftalilopez4834]

im putting everything new the only thing i dont no is to do the timing

[@unbinaomi284]

Hai, I'm from indonesia, I watched your video, it's awasome. Can you help me? For this time, I was make a road race motobike, I confused about head squish degree, can you help me? To tell about size? My bike is 119cc. Thank you.

[@49ccscoot]

The angle of the squish band in the head usually matches or is close to the angle of the piston crown, if that's what you are asking. If you mean how much clearance, then often it's 2-3% of stroke.

[@pipemanganja]

what kind of rod are you using is that a lead rod or just and ordinary metal rod?

[@49ccscoot]

If you mean what I'm using to check, it's solder. Any solder should work if it's thick enough.

[@jordangomez051]

hi, do you are the video in spanish?

[@valdembergesportes6993]

traduza para PORTUQUE. por favor. obrigado.

[@irate74]

What octane do you think would be necessary for a squish clearance of 0.6mm ?

[@49ccscoot]

Depends more on the compression ratio than the squish clearance.

[@irate74]

@@49ccscoot got a vid on how to calculate the compression ratio?

[@49ccscoot]

@@irate74 kzbin.info/www/bejne/bmjEeYecrcanl8k

[@JohnnyLee8355]

Does bigger squish clearance cause high compression or small squish clearance?

[@49ccscoot]

Wider clearance lowers compression. Anything you do that increases the space above the piston at TDC is going to lower compression. I have a video about compression ratio up if you want to learn more about it. Sorry the reply is so late. It was flagged for some reason and I just saw it. kzbin.info/www/bejne/bmjEeYecrcanl8k

[@mikemraz8569]

Use 1/16 solder and put it over the wrist pin

[@jimccc9467]

I always did a cross held in place with grease then averaged, but that was pulling heads each time.

[@ipray4yousmc]

What could be why I'm getting only 30 compression

[@49ccscoot]

+marc A compression tester that doesn't seal, stripped threads in the spark plug hole, engine wear or damage.

[@ipray4yousmc]

And no start but good spark

[@ipray4yousmc]

all it well do is turn to Liquid Brun up right

[@49ccscoot]

+marc Depends where it is. It's not really gonna hurt anything if you get a small amount in the combustion chamber, but it's still best to try not to.

[@apidetpinthong2255]

แปลไทยด่วนๆ ใครไทยไลท์เรย ^^

[@williamoliveira7272]

traduza!!!!!!!!!!!!!

[@stevefox9129]

darn thats why the crankshaft bang over... dude how to balance single crankshaft... whats dial and tools provide.. all the measurement,, i mean just to darn heck balance it... scoot engine stuff,, porting,, bore,, bearing,, ratio.. btw tq

[@NKVSKI]

only one time rotation needed, by kick starter or spanner, not electric starter sorry for bad english

[@SoloAmatori2t]

Anch'io devo fare questo lavoro al mio Aerox 100cc ma sotto lo 0,9 non scenderei per stare in sicurezza 😉

[@dhonemarinho9302]

Legende para portugues!

[@Bultrexsmoke]

dominicano

[@puspakamalan]

see my 125cc 2 stroke power

[@ipray4yousmc]

You mean the top cylinder not the bottom

[@49ccscoot]

+marc Right.

[@urospetrovic5228]

(Y)