Show us your fully worked YX motors. Do you love em?

[epod]

Hey bro's I thought tech talk is a bit stale lately so I thought I try to find out what some of you guys are doinging with you YX motors. I know of all the options out there but my 150 and 160 are still stock and running great after 12 months flogging riding. I have replaced the clutch and stator in my 160 during that time and no issues with the 150. They have both done about 35 to 40 hours over twelve months. I cant wait to work one of my 2 mootors though, I have a 7.2mm akunar cam to go in but I figure I will wait until 1 is due for a piston and rings and then do the works, new clutch, cam, high comp piston, bore out barrel probably my 160 pitster up to 184cc
So id like to know who is on big bore bikes like 172cc 184cc or even 192cc. Whats you set up, did you build it yourself. Has anybody used a stock barrel bored out or resleevd. Do you use a stock or ported head. Is anybody running six plates in stock clutch basket. How much fun are they compared to the stock motor and have you had any reliability issues before or after 15hours of riding. Also What gearing are you guys running.
Ride on.

 

[DvDRip]

I'm in the process of fitting my oldskool yx160 to my frame right now, just having a break it's farkin hot today...

I got some plans for it, gonna cam it and port the head, and a ORK. for some reason my 160 came with the oldskool heavy flywheel, stingy *******s.

this thread should be good, I'm pretty keen to see wat others have done to theirs and 6 plates in stock clutch sounds interesting

 

[Frankie39]

yep, i am interested to know what plans people have and what they have already done.
as DVDrip knows im in the process of trying to decide what is best for my 160. i do love the 184cc idea but i figure everything else will break around it!

 

[SGONE]

heres mine not fully worked but not stock

YX 150

tb v2 head

tb rear facing manifold

tb push button decomp

gen keihin pe 28mm

inner rotor and reeg weight

billet slinger

H/D clutch springs

upgrade needle bearing case

gonna see how it holds up might go 170 and 6 plate upgrade in stock basket or cross the border and go the daytona 150

 

[pbk]

woah saga thats nuts

do you have a vid of it in action??

 

[SGONE]

no vids yet has'nt been on it's maiden voyage...

 

[tormentandglory]

Here's a few pics of my engines. The first one is a dirtmax yx150 with a TB 165 V2 kit on it. The head is ported, valves are lightened, 0.8mm squish clearance, 11:1 compression, 5deg advanced cam timing (slotted sprocket), cam chain tensioner has been modded to manual, lifan 150 ORK, 28mm oko flattie on a custom made manifold, japanese bearings, HD clutch springs, akunar breather tank, alloy kicker from unknown japanese donor bike, custom made stainless steel mandrel bent 1 1/4" header pipe, and various other little mods This engine pulls my z50 to speeds over 130km/h.

This next engine is not complete yet, I'm still waiting on a few parts. Its a yx160 bottom end, originally with the needle roller cases. I've machined the cases out to take a 16002 ball bearing instead of the needle roller, and I've machined the main bearing bores deeper to take 6322 main beaings. It has a modified jialing 110 crank and a longer conrod which gives a bore x stroke of 60mm x 49.5mm (140cc). All the shafts and shift drum have been shimmed to less than 0.2mm float. Atomik 150 clutch cover with oil filter. The cylinder has been shortened and had the tensioner modded to manual adjustment. The head is a dirtmax honda port type and has been heavily ported. Valves and retainers are lightened, shortened takegawa valve springs, TB#0304 camshaft, and its had 1.5mm machined off and its also been welded along the sides to get compression up to 11.1. The piston has been machined to suit the new chamber shape. Almost every component of this engine has been machined or fiddled with in some way. Still more work to be done but I'm expecting this one to be a screamer

 

[bournie]

Here's a few pics of my engines. The first one is a dirtmax yx150 with a TB 165 V2 kit on it. The head is ported, valves are lightened, 0.8mm squish clearance, 11:1 compression, 5deg advanced cam timing (slotted sprocket), cam chain tensioner has been modded to manual, lifan 150 ORK, 28mm oko flattie on a custom made manifold, japanese bearings, HD clutch springs, akunar breather tank, alloy kicker from unknown japanese donor bike, custom made stainless steel mandrel bent 1 1/4" header pipe, and various other little mods This engine pulls my z50 to speeds over 130km/h.

Thats the kwlest china bike engine I think I've ever seen!

 

[Metalmulisha 110cc pro]

Hey dvdrip where abouts did you pick up your external inline oil filter from for you yx ?

 

[DvDRip]

these guys sell them OEM YX150 160 engine oil filter dirt bike pit bike:eBay Motors (item 150401477895 end time Jan-29-10 12:11:19 PST)

 

[dafunk]

http://www.miniriders.com.au/fotm-fifty-month/24737-september-fotm-entries-2.html
yx160 .it has a 180+cc skirtless piston in it [taki] and taki roller rocker head ,kitico inner rotor ign ,fmf full ex, molk carb size ? i fitted a upgraded r/h case to it and have had minimal drames .
it did 09 hri series and i have ridden it hard motard style for a while . its getting tired now .
its still fast as .
see it on the 15th at archy on crap tyres he he [should be sliding heaps]

 

[wogtaz ryder]

Mines z155 , with v2 head s35 cam , and ported by Daimojay ... and it is pretty damn fast!

As fast as you will ever need for a minibike track..
But for a big bike track you need all the power in the world..

I duno if i will ever go bigger....

Shall see next rebuild Heh heh

 

[epod]

Does the push button Decomp work well?

Just wondering how well the TB decomp button works. Is it worth the money.
Dafunk does the taki head have a decomp cam or not. is you bike easy to start? Do you still use the stock 5 plate clutch? If yes, has the 180cc broken any clutch baskets.
Ride on

 

[Metalmulisha 110cc pro]

cheers Dvd Rip

 

[sean01]

thought id bump this up to see if theres any progress with anyones engines