GT-5 SUPER port timing adjustment video

[@ericmcginnis2097]

I would love to be a mouse in your shop. Soaking up knowledge. Or an intern learning your trade. On the other hand knowledge is one thing, but having as ll of the tools is another. But if ik could learn i could later gather ass ll of the nessecary tools! Thanks for all of your contributions to the hobby and two strokes in genera l!!!

[@traceanthony3588]

what I did on my engine was widen the exhaust port on each side by 1mm and it gave significant bottom end without sacrificing top end, seeing as it runs around 11-12,000 rpm

[@supersportryder]

I ported the potatoes out of a pk80 40mm stroke raised the exhaust real high and the intake low. I wanted more compression no base gasket, high temp silicone. Piston was hitting at tdc as motor would not turn forget cranking it. Used 2 copper head gaskets cause I didn;t feel like didturbing my silicone work and the end result is a gorilla. Thank you Fred for explaining what I did. I increased squish band with 2 head gaskets while retarding my over zealous exhaust port and helping my intake with no base gasket.

[@williamccjr]

Great stuff, Fred, thanks for sharing. Just FYI: When you need to get the camera to focus onto something up close, like your custom needle nose pliers, put your hand behind behind the object, I'm sure you've seen people do this in videos before, it forces your camera to focus on what's right in front of it and not the background.

[@rivercity3908]

Fred rules, thanks for another informative and educational video!

[@anunentitledmotivatedmille7731]

River City my bike dosent start after bogging down i have spark when i took the top end off i noticed a dent where the base gasket seats do u think that could be the problem

[@gaborhajdu4692]

The piston was inserted into the cylinder without oil. Then the cylinder was even pressed in from above. Give it to him from above! Bang

[@reillystsb]

Hold your hand behind whatever you're trying to get the camera to focus on

[@thekingsilverado9004]

Hey Fred it's me.... Ya know it was back around Christmas I chased down a Snap On truck just to buy a fucking pair of curved needle nose pliers.... Guess what I just lose em last week in the shop... Have not a friggin clue where the hell I put em at.... Good video buddy spells it all out.

[@danielrose1692]

thanks for all the great vidios fred your a great teacher

[@mikehoffman5923]

would really like more videos and more understanding from Fred... please make new videos

[@VagueAloof]

Ive lost 4 wristpin clips never to be seen again😐

[@reillystsb]

that's funny cuz I did the same exact thing to a pair of Mac needlenose for grabbing circlips

[@justinchampagne2818]

Have you seen this engine kit cuz I have no videos online I love you to see how you take it apart and assemble it back together 80cc Bullet Train Electric Start Bicycle Engine Kit - 2 Stroke Gas Powered Bike Motor Engine

[@Nickpeezy94]

Hey Fred could you email me a clear picture of the intake side of piston ?

[@richardnorris3367]

Thank you for the video. One question, What do I do for a stripped /seized screw? Don't have the fancy tools.

[@BakingBread777]

Do u still have to shaved the bottom of the piston skirt with a window piston?

[@ghettobikelife8833]

T Trinh no, windowed piston only works with reeds. Fred’s motors are piston port (no reed), trimming the skirt increases the intake duration for higher rpm

[@Milner62]

Hi Fred, I am looking at getting a Zeda 80 Weekend Warrior unassembled to tinker with. Wanted to get your opinion on mods for this engine? I will be running a high compression head, aftermarket CDI, two piece exhaust. But for the most part I am looking at starting off with port matching and polishing the intake/exhaust on the jugs not sure I want to mess with the timing on the jug.

[@victordublin5773]

Good stuff

[@kjsmolik]

Mike these are 66cc gt5 or 69cc pk80. 80cc is Chinese conversion.

[@cynthiaroesner1719]

Lot of torque? Smaller sprocket

[@dannytorino7409]

I have a CDH reed valve with a windowed piston. Ive got the Gasbike supercharged Coil & CDI. NT Carb. Note: I match ported everything. I have not added a boost port yet. I may have enlarged the vertical dimensions a tad too much on the intake port, as It seems the bottom end fell off a bit. Im compensating this by switching my 48t sprocket to a 56t soon. My question, based on timing and stuff, if I were to add a boost port to the jug, would that help restore or increase the bottom end? I live in Mass with alot of steep hills to climb.

[@whysthat2877]

48 to 56 is a massive change

[@rara-xq5nn]

Where to biy your engines. Im in toronto

[@JS-fb6ww]

I bought the zeda80 because I have a half-breed that I installed new SKF bearings in. Unfortunately after completing the bearing installation, I couldn't get the 2 crankcase halves back together again. For some strange reason there was about an 8th of an inch gap between the two halves. The bearings were in as far in could get them with the bearing puller. So now motor is in pieces and just sits unused. Any insight or advice on why that happened or how to get the 2 halves to meet and sit flush?

[@whysthat2877]

Use 3 or 4 gaskets lolololol

[@waterboy4124]

The double row ball bearings are too wide. Just kidding. Theres real thin shim washers on the crank you can take off to make room.

[@DirectCurrent4u]

@@waterboy4124- Do you really think that the two 'real thin shim washers' are going to make up for the 1/8 of an inch gap that he has? lol

[@waterboy4124]

@@DirectCurrent4u um, several thin ones. I counted 6 on mag side, 4 on clutch side. Thats wha ? 25 thousands. Oh yeah whack the case good to seat em. I'll sell ya a case splitter for cheep too. He'll get it, after a few cases. How many tries it take you?

[@monkeyjuju7441]

Quick question, could you tell me the relative dimensions of the largest piece of the engine when taken apart? I'm looking to buy a kit this week, but I noticed from the photos a lot of them have shitty paint, and I have a powder coating system but my oven is a tiny little $20 modified toaster oven so I'm trying to figure if I should just buy a bare metal one and powder coat it myself (though then the exhaust will be chrome :/) or just buy a black one and deal with it

[@JS-fb6ww]

Chris Carr, it's rare for him to reply. I'll check my 66cc dimensions and get back to you. BuyThe looks of it it may very well fit a toaster oven. It'll be tight. I

[@ericballes9551]

im see if i get it this weekend working on a huffy from the 80s looks like a rat rod bike its going to bw wicked with that gt5

[@turrettooling1968]

It's a GT-5 SUPER. It has a special crankshaft built by CR Machine. Only available from CR Machine. For expansion chamber exhaust only. Will not run well with a stock exhaust muffler.

[@ericballes9551]

boss whatever i need im getting it from you. no more china builds for me i always having them motors over heating no matter what i do it get it right

[@benmitchell9362]

i have a problem. with my clutch. i. replaced it. but it mess up again. it wont disengage but it will fully. engage. ive adjusted. it alot then it goes back to messing up

[@stilltlrforlife]

what about making a knife edge connecting rod to reduce turbulence in the case.

[@ThatRedGTI99]

This does not affect the vibrations?

[@joshuaharrison9331]

lol the swarf buildup on the floor!

[@shaunc4209]

Get yourself a gt7 pro racing I'm actually trying to figure out who makes the gt7 pro racing engine because that what I have and I have alot of money in to my let's name her my side chick because all my spare money goes into my motorized bicycle but I freaking love my bike it's so fun to ride and I get alot of compliments ☺️

[@thekingsilverado9004]

I SEE FRED GETS ALONG WITH HIS CAMERA ABOUT AS WELL AS I DO..

[@DOTdirtbiker]

Genius.

[@bigdevil1310]

I have a zae80 and i need a cylinder for it badly i cant get it to run right with my jugs because the rod its longer do you sell jugs for my type i hope so

[@waterboy4124]

Dont be afraid to take dremel cutters to the head and make room for the piston. One of my meanest motors ever ran that way. Add a base gasket if the rings trying to pop out.

[@bigdevil1310]

@@waterboy4124 i made bout 5 cardboard base gaskets i put them on got the bike up to 41mph but the gaskets leak bad every 2 or 3 days i have to clean it up

[@bigdevil1310]

@@waterboy4124 it wants to go faster

[@waterboy4124]

@@bigdevil1310 theres this gasket called garlock. Its awesome

[@waterboy4124]

Roofing felt works decent. For the head carving you just need steady hand, a drill and a cutter burr with a barrel shape. Square nose so to say. The higher the cylinder rides, the more it likes hi rpm. The lower you run it, more torque. Takes bout 3 weeks of easy riding to break it in. Outta nowhere you'll mysteriously get power that 4th week

[@anunentitledmotivatedmille7731]

my bike dosent start after bogging down i have spark when i took the top end off i noticed a dent where the base gasket seats do u think that could be the problem

[@jeffreymaynard5367]

how to get muffler studs off the motor would be a good vid

[@poopyloopy2141]

Jeff Maynard lol mine are stripped out

[@gillyboyrg2]

That's simple put two nuts on the thread then lock them together and the stuff will come out works on any type of stud.

[@keithfreeman5204]

Double nut the stud,lock them together, then just back the stud out, do the same for the other one. When you run the studs in use "RED" lock tight, available at any auto parts store. Just a dab will do.

[@paramandans]

Sent your shop a message for some help and was hoping to receive some kind of reply.

[@MetalMaster8888]

And now you loose the compression ratio cause piston in the upper dead point is too low and can't reach the cylinder's edge.

[@Tyerill16]

How much for ah fast engine

[@davidfuller764]

Thanks!

[@ericballes9551]

can i buy one boss?

[@turrettooling1968]

Yes. Go to www.crmachine.com

[@taitheguy85]

For future reference, those camera focus issues can be solved by filming with ur camera's lil flower icon button pressed.

[@turrettooling1968]

Thanks. I'll try that.

[@gillyboyrg2]

Tai Theguy the flower icon aka "macro mode"

[@JS-fb6ww]

Fred why do you love the gt5 so much? You're the only person I've ever spoken too that had something good to say about a motor with m6 studs and Phillips head bolts. What's so great about the gt5? The zeda 80 is a much more sold motor.

[@turrettooling1968]

The ZEDA 80 engine is a copy of my GT-5L, but it's a poor copy with an inferior crankshaft. Both my GT-5L and GT-5 Super are special engines available at CR Machine only. Those engines are high level engines that are completely reworked, including the crankshafts, which are fully remachined and new parts fitted. There is absolutely no comparison between a factory ZEDA motor and any motor from CR Machine. Two very different leagues.

[@JS-fb6ww]

Frederic Chelminski, I was more refering to which is better of the two; the STOCK gt5 or STOCK zeda80? Or are they comparable in their stock (out of the box form)?

[@turrettooling1968]

Okay. Well, the ZEDA 80 has better performance for expansion chamber exhaust, but it's a racing geometry, so they don't perform well with stock exhaust. Also the ZEDA motors use low quality connecting rods, so, I don't use those engines. Premature bearing failure will occur from having oversize journals. I mean, they will run for a while, but they don't meet my specs. I always change the rods of those engines if I get them in the shop.

[@JS-fb6ww]

Frederic Chelminski, thanks Fred for your reply. What exactly would be so poor about the connecting rod on the zeda 80?

[@waterboy4124]

@@JS-fb6ww its a long rod so all that zip Rob is selling you is gonna wear its bearing pockets out faster unless you loctite green them in there.

[@bobbywagner9803]

Use no bace gasket for top speed

[@tjdukes7452]

do u have a website? u said u sell engine ....can I get some contact info

[@tjdukes7452]

Ronald Whittaker OK......thank you so much for answering my questions!!!!

[@seanryan2401]

+Tj Dukes he sells motors on eBay

[@JS-fb6ww]

Crmachine.com

[@mjj9325]

Fred #1 no reeds

[@JS-fb6ww]

mj j, what do you mean by "no reeds"?

[@joserobles3123]

This is for GT5 engine or for allí engines

[@turrettooling1968]

CR Machine's GT-5 SUPER is unique. It is not a standard GT-5. Crankshaft geometry is different. GT-5 SUPER is available from CR Machine ONLY.

[@ernestososa2892]

Can you rebuild a engine

[@keithfreeman5204]

OH, Come on. These engines are really simple. Learn something new and do it yourself.

[@NoboaIsrael]

heloow there from Ecuador i got a cuestion what happen if i put the arrow in the piston to the intake side? can u tell me plz i think i made a mistake with that

[@turrettooling1968]

Don't pay attention to the arrow. Sometimes they point forward, sometimes it's pointed backwards. Piston ring end gaps should be facing the rear (intake) side of the cylinder. Even if you were to accidentally install the piston backwards, the engine would still run fine because even if the ring end gaps are facing front, they won't get fouled in the exhaust port. Either way you have it, no worries.

[@NoboaIsrael]

Thank you very much for your answer, although you do not believe me yesterday I could not sleep thinking about the error of the arrow of the piston, you have made me breathe again. What do you think about the porter piston when you have the reeed valve? I bought the engine with the reed valve but I realized that I had not done the porter piston if I took it out and never fixed where the arrow was going

[@Anthony123999]

is double gasket bad shit going to leak

[@m.kasper7646]

Fred, one does NOT "DRIVE" a bike One "Rides" a bike.Nuttin but 💓 4 ya brudda. Just a little constructive criticism.👍🏁🚴

[@dougie350]

Has anyone seen this yet? Gen/starter new location,Ram Air? kzbin.info?o=U&video_id=52qUxh3T7Ak

[@georgelackey622]

This is just some who claims to be an engine producer, he is only someone that re-machines Chinese engines! They are all hit and miss, some some not so good!

[@jorgematos4476]

Cr machine is so Spencer for me is bad work

[@johnathanhimka]

uh so uhh ummmm and sooo uh ummm ummm ummm

[@genellaevans2378]

Dude are u drunk?

[@tyronep5611]

Dude just get to the point gezzz

[@donalderkelens9916]

Who is this kook on the port timing oh my God get off