XR 70 TB 88CC Big Bore Kit Install
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- Опубликовано: 2 авг 2021
- Today I install a TB 88cc kit, and a Hotcams cam chain on a XR70. This video should cover similar models XR50,CRF50, and CRF70
www.ebay.com/itm/171510587419...
www.ebay.com/itm/393383919034...
www.ebay.com/itm/372941475927... 
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Excellent video! Great job explaining every step. 👏
Great vid! Thanks
Best install video on RUclips. Killed it…..other than the small mishap, shit happens!
what mishap?
Nice video.
Can install this kit on a super cub c70?
Excellent instructor, I just did this the other day but I can see I did some things wrong. the oil ring I didn't sandwich between the two rings, I tried to put one on but it would seat, so I left them out, probably not a good move and I didn't know that the IN on the piston meant intake so I have that pointing down. the bike starts and runs strong. it was smoking really bad before I did the job and it's still smoking but runs strong. how major were my flaws and what can I expect down the line? My eyesight is not that good and I didn't have that manual. it was my first time ever doing it. please advise. Thank you very much
All things considered great job getting it to run your first time even without a manual.It is hard to see the oil ring, but if you feel it there is one side that has a lip. Install it with the lip towards the back so the oil ring rails can seat up against it. Unfortunately it will continue to smoke pretty bad without the oil control ring. I would also recommend reinstalling the piston with the IN towards the intake side. You shouldn't need new gaskets but if you do they are only like 25$ on ebay.
I also recently did a video on a 2020 yz450f rebuild. I would recommend it to you only because i go over ring installation in pretty good detail in that video, and although it is a much bigger/ complex bike the information about the rings is still useful. Here is a link to it ruclips.net/video/wBXwB_nEq3E/видео.html
@@larryc OK thank you for your reply. Like I said it was smoking before I did the job , so you think the old piston had bad oil rings as to why it was smoking. And me not doing it right just didn't fix the problem. The flimsy ring I got on just couldn't get the other one to seat, and didn't know it had two stiff rings on each side of that flimsy one.
Yes definitely was smoking before due to worn-out oil control ring, and still smoking because of oil ring not being installed properly. Once you get it back together right it should run strong and not smoke. Hope you get it back together soon and let me know if you have anymore questions.👍
@@larryc Bravo to you man! I took the piston back off, and was able to get those two oil rings to sandwich that flimsy ring, turned the piston right side up. Runs like a champ, no more smoky Joe. Appreciate you man, a whole bunch. Thanks bud.
If you don’t need to replace the cam chain then you don’t need to take the stator right? I know it’s a long sentence sorry. But all you need is to do is the tear it down to the piston then back up right?
Correct! I only removed the stator because I needed to replace the cam chain. If you are only doing a rebuild, you won't need to remove the stator.
My bike have a 47mm 72cc cilinder , can i put a 52mm cilinder withput any more modification? Sorry for my nad english, regards from Romania !
I didn't have to do anything to my carburetor. My stock jets allowed the bike to idle fine, and it also doesn't break up on the top end, so it is getting plenty of fule. I even kept the stock airbox. That said I will eventually get a bigger cab, and put a uni airfilter on it to make it faster for my son.
I was only upgrading the bike for my son, and didn't want to give him Too much power at one time. If you want to make the bike much faster here is a link to a full race kit. www.ebay.com/itm/203409946315?hash=item2f5c2d76cb:g:8DQAAOSw-cJgift6
I don’t get why they use Phillips like flat heads are Soo much better really hard to strip
Does the kit come with new piston rings?
Yes
Was the power upped noticeably.?
Yes it is definitely a noticeable increase in power. They do sell this kit in various stages with a race head,cam, and carb. I only installed the cylinder and piston because this is plenty of power for my son to have fun in the trails. But if you are building a pit bike for yourself I Would say just get the whole kit for all the horsepowers.
I also have this kit from
.50 caliber...stock gearing xr50 pulls up in all gears ....top speed went from 37 to almost 50
Use a 20mm carb and cam ,exhaust,air filter..
Did any of you install a high volume oil pump and is it completely necessary for the 88 kit? I want to do the install but intimidated by splitting the case
@@baileyteg1 No need to install a high volume oil pump. The oil pump in it will circulate plenty of oil to the top end. When you do the install make sure your oil passages are clear and you install new o rings.
Very well done how to video. Thanks Larry!
Your piston shaft looked soooo bent lol
Drink every time he says “go ahead and”
Just installed the tb race in my crf70f and it made less power this cam sucks was running with a ttr90 but after the cam he smoked me
Tb race cam sorry
Man that sucks! I think you need to install the race head, carb,and cdi box with the race cam to get the most out of it. I am actually going to get the whole set soon because my son is ready for more power. I will make a video on it and give my thoughts on it, and let everyone know if it is worth it or not.
79 cobra, are you saying this kit will make less power than stock? I plan on just the bare kit because i want more power without all the upgrades.. please confirm.
@@s2000pill I just did the cam, I don't know if they sent me the wrong one but the lift and duration was less so I went back with stock
@@79cobra13 got
it! yup. i just want to do a 88cc bore kit. the $139 tb or $199 bbr kit and nothing else as i want to keep it reliable for my 9 year old. just want a tiny more power. i don’t even want to fiddle with installing the high volume oil pump as BBR didn’t even mention it
No offense cuz I like the video but needle nose pliers and twist the circlips right in. Easiest way.
No offense taken, bro! Thanks for the tip.
As I was pulling off my head, I noticed that the copper washer was under the bottom left nut right from the factory.
At 13:16, those ARE NOT Phillips Head screws, but actually Japanese Industrial Standard (JIS) screws. Use the proper screwdriver or you chance stripping out the screw heads. Also, an impact driver works best to break them loose.
If you could go ahead and remove "go ahead and" from your vocabulary, that'd be great.