Planet Minis

arlindsay1992 · 09-09-2006, 01:04 PM

Just what the title says. I'd like a link.

AHPminis · 09-09-2006, 01:09 PM

Powroll and Wiseco both have one.

arlindsay1992 · 09-09-2006, 01:10 PM

Would it work with my TBQ race cam?

arlindsay1992 · 09-09-2006, 01:18 PM

The Powroll one looks good but way expensive. I can't understand the Wiseco website and can't find the piston.

arlindsay1992 · 09-09-2006, 02:36 PM

I managed to make my own high compression piston. I took a 1984 Z50R piston and ground down enough with a dremel to make it fit with a CRF50 head and TBQ cam. I know it will not bash inot the valves because I checked it without the base gasket and a used head gasket. If I had used a new head gasket, there would be more room than a torqued down one because it wasn't compressed. So when I put in a base gasket, then there will be even more piston to valve clearance. So I will test it with an old head before I put on a good one. (just in case I'm wrong about it fitting)

birddogg · 09-09-2006, 04:17 PM

Custom. Let us know how it works.

arlindsay1992 · 09-09-2006, 04:58 PM

I will.

50WHIP · 09-09-2006, 06:15 PM

If it doesn't work out go to dr.atv.com and they have what you're looking for.

arlindsay1992 · 09-09-2006, 06:35 PM

DrATV doesn't sell high compression pistons for the stock bore. I am sure because I even e-mailed him and asked.

50WHIP · 09-09-2006, 06:41 PM

Yeah ,I thought you were runnig a 88 cc for some reason.I ran the wiseco high comp. in my stocker with a web cam ,bored carb,and mod. stock pipe and that thing ripped ,it would keep up to some of the slower big bores out there which was fun when they would ask what I was running and told them a stock 50.

arlindsay1992 · 09-09-2006, 06:45 PM

I'd like an 88 but then I can't legally ride on the streets. In Loudoun County, I can ride on streets up to 45mph speed limit without lights, horn, insurance, title, licence, plates as long as I'm running 49cc or less and I have three or less wheels. No age limit so my three year old cousin could ride it. And I know I could get a cylinder marked 49 yada yada yada but my dad won't let me buy it. He says "Sure you can buy it and install it but you can't ride it."

badphish · 09-09-2006, 07:16 PM

this is the same thing you thought i shouldn't do 2 weeks ago lol. Not shure if i'm going to clearance my piston or use the bigger vavled head off the import

dirtbkr188 · 09-09-2006, 07:57 PM

Quote:

Originally Posted by qwoke-q

... I can't understand the Wiseco website and can't find the piston...

Here's a little help for you, qwokie...

Here is the URL for the Wiseco page, the XR/CRF50 pistons are listed on page 5 of the 7 page Honda catalogue. There is a listing for 3 pistons, but only one you can use, as shown above, to stay within the 49cc parameter you have set for yourself.

http://www.wiseco.com/PDFs/Catalogs/...aCycleDirt.pdf

arlindsay1992 · 09-09-2006, 08:36 PM

So what's the price? And what does it mean by "Cylinder boring required for oversizes?" If it fits the 39mm bore then why does it mention boring? If my piston doesn't work, I'll consider that.

50rider340 · 09-09-2006, 09:11 PM

i did that with a 72cc motor to fit my stock honda head. Worked great i couldnt believe it ran awesome too.

dirtbkr188 · 09-09-2006, 09:25 PM

Quote:

Originally Posted by qwoke-q

1. So what's the price? 2.And what does it mean by "Cylinder boring required for oversizes?" If it fits the 39mm bore then why does it mention boring? If my piston doesn't work, I'll consider that.

1. $68.67 for the top 3 sizes, and $75.54 for the last 2 sizes.

2. If you have a cylinder that is worn out, and measures to be 39.38mm, you need to have the cylinder bored out to the next piston size, which would be 39.50. You would need to have a shop measure your cylinder bore size before ordering the correct size piston kit to fit your cylinder. Once you have the correct sized piston, the cylinder is then bored out to match that specific piston size.

mikep · 09-09-2006, 10:11 PM

I don't know whats available for you guys over there, but would't you have been better off getting a high comp piston to suit your original head with bigger valves and ports?

arlindsay1992 · 09-10-2006, 06:52 AM

I couldn't find any aftermarket engine parts for my 1984 engine. It's all for pre-1982 and 1988 to present. And yes I did suggest not to grind your piston. I've learned a bit since. dirtbkr188, if I have a cylinder from 2003, and it's been ball honed twice, and I've gone about 500 miles, do you think it's worn too much to use stock piston and rings?

dirtbkr188 · 09-10-2006, 07:34 AM

Quote:

Originally Posted by qwoke-q

... if I have a cylinder from 2003, and it's been ball honed twice, and I've gone about 500 miles, do you think it's worn too much to use stock piston and rings?...

Well qwokie, taking into consideration that the cylinder is 3 years old, my guess is that there is enough wear that may warrant having to get it bored to the next size up. The best way to know for sure is to have the cylinder mic'ed correctly by a reputable shop, and go from there.

arlindsay1992 · 09-10-2006, 07:37 AM

I think I'll live with the current cylinder bore.

09-09-2006, 01:04 PM	#1 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	Anybody know where to get a high compression piston for a CRF50 with stock head? Just what the title says. I'd like a link.

09-09-2006, 01:09 PM	#2 (permalink)
AHPminis Advertiser Join Date: Aug 2004 Location: East Coast - PA Posts: 4,629	Powroll and Wiseco both have one. __________________ Website - www.ahpminis.com Email - mark@ahpminis.com AHP - TB -Sano - RB - Kitaco - iShock - Fox - Marzocchi - F50s - Utopia - Takegawa - Crower

09-09-2006, 01:10 PM	#3 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	Would it work with my TBQ race cam?

09-09-2006, 01:18 PM	#4 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	The Powroll one looks good but way expensive. I can't understand the Wiseco website and can't find the piston.

09-09-2006, 02:36 PM	#5 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	I managed to make my own high compression piston. I took a 1984 Z50R piston and ground down enough with a dremel to make it fit with a CRF50 head and TBQ cam. I know it will not bash inot the valves because I checked it without the base gasket and a used head gasket. If I had used a new head gasket, there would be more room than a torqued down one because it wasn't compressed. So when I put in a base gasket, then there will be even more piston to valve clearance. So I will test it with an old head before I put on a good one. (just in case I'm wrong about it fitting)

09-09-2006, 04:17 PM	#6 (permalink)
birddogg 2nd Gear Member Join Date: Sep 2005 Location: Northern Cambria, Pa Posts: 597 My Mood:	Custom. Let us know how it works.

09-09-2006, 04:58 PM	#7 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	I will.

09-09-2006, 06:15 PM	#8 (permalink)
50WHIP 3rd Gear Member Join Date: Apr 2005 Location: INDIANA PA. Posts: 1,991	If it doesn't work out go to dr.atv.com and they have what you're looking for.

09-09-2006, 06:35 PM	#9 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	DrATV doesn't sell high compression pistons for the stock bore. I am sure because I even e-mailed him and asked.

09-09-2006, 06:41 PM	#10 (permalink)
50WHIP 3rd Gear Member Join Date: Apr 2005 Location: INDIANA PA. Posts: 1,991	Yeah ,I thought you were runnig a 88 cc for some reason.I ran the wiseco high comp. in my stocker with a web cam ,bored carb,and mod. stock pipe and that thing ripped ,it would keep up to some of the slower big bores out there which was fun when they would ask what I was running and told them a stock 50.

09-09-2006, 06:45 PM	#11 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	I'd like an 88 but then I can't legally ride on the streets. In Loudoun County, I can ride on streets up to 45mph speed limit without lights, horn, insurance, title, licence, plates as long as I'm running 49cc or less and I have three or less wheels. No age limit so my three year old cousin could ride it. And I know I could get a cylinder marked 49 yada yada yada but my dad won't let me buy it. He says "Sure you can buy it and install it but you can't ride it."

09-09-2006, 07:16 PM	#12 (permalink)
badphish 1st Gear Member Join Date: Feb 2006 Posts: 146	this is the same thing you thought i shouldn't do 2 weeks ago lol. Not shure if i'm going to clearance my piston or use the bigger vavled head off the import

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09-09-2006, 08:36 PM	#14 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	So what's the price? And what does it mean by "Cylinder boring required for oversizes?" If it fits the 39mm bore then why does it mention boring? If my piston doesn't work, I'll consider that.

09-09-2006, 09:11 PM	#15 (permalink)
50rider340 3rd Gear Member Join Date: Mar 2004 Location: CT Posts: 3,083 My Mood:	i did that with a 72cc motor to fit my stock honda head. Worked great i couldnt believe it ran awesome too.

09-09-2006, 10:11 PM	#17 (permalink)
mikep PM Newbie Join Date: Jan 2006 Posts: 85	I don't know whats available for you guys over there, but would't you have been better off getting a high comp piston to suit your original head with bigger valves and ports?

09-10-2006, 06:52 AM	#18 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	I couldn't find any aftermarket engine parts for my 1984 engine. It's all for pre-1982 and 1988 to present. And yes I did suggest not to grind your piston. I've learned a bit since. dirtbkr188, if I have a cylinder from 2003, and it's been ball honed twice, and I've gone about 500 miles, do you think it's worn too much to use stock piston and rings?

09-10-2006, 07:37 AM	#20 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	I think I'll live with the current cylinder bore.