XR150 / CRF150 300cc Big Bore Pt. 3 Top End Disassembly

[@salitysss981]

wow nice video your bike is awesome.. I just found out there is a machine similar to CRF in America with carburetor technology, in my country Indonesia bore up 300cc is considered extreme for daily use. We are usually advised by mechanics to bore up to a maximum of 250cc and that can produce power of around 33-35 HP on a dynojet, BRT products are indeed good but if installed directly without re-tuning the wild power is not released, in our country we do re-porting and analyze it with a flowbench machine (we don't like the dimple/golf porting from the BRT because the flow is not good on the high lift camshaft) and re-customize the camshaft with higher lift, duration and overlap and increase the compression ratio.

[@DustySteel]

@@salitysss981 thanks for watching and subbing, if that was you! 300cc is definitely extreme and not for daily use. I should’ve had the head made and flow tested but this is my first build and this was the first head that I had seen in this size. I’m definitely going to install the wideband again to help tune the carb. I’m going to also have the piston and cylinder treated so it will stay cooler and last longer. I’m also going to add an oil cooler or two.

[@Dailyshortss365-r7l]

Love your XR150 vids

[@DustySteel]

@@Dailyshortss365-r7l thank you so much for watching and subbing, if that was you! New video coming soon.

[@TheMotorcycleMessenger]

Excited for the results! Throw some SM wheels/rims on it next. 😮

[@DustySteel]

@@TheMotorcycleMessenger thanks for watching! Maybe someday.😊

[@TinShackVideos]

Very Good! ...and I see you didn't get a faulty cam chain guide like I did.

[@DustySteel]

@@TinShackVideos thanks for watching! Luckily I caught it right away.

[@613Builds]

Keep the good work. 😎👍 Was there an oil gasket under the barrel?

[@DustySteel]

@@613Builds thanks a lot! Yeah, I just forgot to show the undersides. It was stuck on the bottom.

[@jackassman5671]

I wish i could get those parts here in South Africa... anyways sick build!!

[@DustySteel]

@@jackassman5671 Abe Engine Idea via FB.

[@DustySteel]

@@jackassman5671 thanks for watching!!😎👍

[@MishMashMoto]

Nice work! I wonder if those parts will fit on my bike? 😎 😂

[@DustySteel]

@@MishMashMoto probably!🤣

[@MishMashMoto]

@@DustySteel let's find out...

[@DustySteel]

@@MishMashMoto I mean they’ll work on everyone else’s XR150L, but not yours specifically.🤣

[@MishMashMoto]

@@DustySteel I will put them on her bike then. 🤣

[@DustySteel]

@@MishMashMoto she probably would love that so that works perfectly then.🤣

[@DustySteel]

Thanks everyone for watching, liking, and subbing!

[@jjjfffppp]

how come you had your petcock on reserve? also i have a stock engine i removed the baffle in the exhaust, opened up the air box. what size jets would you recommend i bump up to? on a cold start if i blip the throttle it conks out. great videos btw, your bike is awesome

[@DustySteel]

@@jjjfffppp thanks for watching and subbing, if that was you. I just moved it for the video to show to turn it off. If you gave it more air to flow then it probably needs more fuel to go along with that air. You could try putting one size bigger pilot and at least a 115 main jet if you are at sea level.

[@jjjfffppp]

@@DustySteel awesome thanks!

[@DustySteel]

@@jjjfffppp I’m surprised you didn’t mention the gas line having a tear in it.🤣

[@jjjfffppp]

@@DustySteel I did notice lol. I figured you had it handled. I asked about the reserve because I thought maybe it made it run better or something.

[@DustySteel]

@@jjjfffppp it doesn’t leak so I haven’t changed it yet. It definitely runs better when you’re able to get fuel.😎😂

[@clevero8532]

Would the 70mm kit work on a 150 Lifan 162fmj? I know it’s a clone 150f. Is the 2006+ parts way different? Also is your bike 15mm piston pin?

[@DustySteel]

@@clevero8532 thanks for watching and subbing, if that was you! I believe the Lifan is very similar. I don’t have any experience with Lifan though. The XR150 is a 14pin I believe.

[@cuongnguyenquoc3947]

I hear people working on xr150l lifan talk about weak gear box. U can bore it up but u cant ride it hard. U will blow bottom end motor. Not even 70mm. If u bore it up 63 and ride at high rpm. U will get rekt

[@DustySteel]

@@cuongnguyenquoc3947 I’ve already done a 70mm kit and was able to go 88mph, didn’t have any issues.

[@DustySteel]

@@cuongnguyenquoc3947 I have heard that too that the gear boxes are weak.

[@cuongnguyenquoc3947]

@@DustySteel ur moto build by honda or lifan mate!? If lifan build, be careful.

[@chaaoo0]

Is it real that xr150l and crf150l share the same engine?

[@DustySteel]

@@chaaoo0 they are very close, the crf 150l has fuel injection I believe.

[@chaaoo0]

@DustySteel i want to build a big bore xr150 is there any necessary part? Except the block and piston? Do i need to change the valves parts? I want it just minimal bigbore build

[@DustySteel]

@@chaaoo0 just the piston and block is fine if that’s all you want to do. You would need to rejet the carb.

[@DustySteel]

@@chaaoo0 the big valve head helps with top end power but is not needed depending on why you want more power.