Planet Minis

mototripleAride89 · 09-03-2009, 09:37 PM

I have a crf70 and have just put on the tb kit with race head. I noticed that my timing is not lining up on the head .... I have everything correct and its showing up right b4 marking or after . Its like it right in between and is making it wrong like it has no ass on bottom but is fast on top........ is there a cam sprocket I was suppose to get with this kit ?????? Thanks for your help

firepower354 · 09-03-2009, 09:43 PM

Did you replace the timing chain?

mototripleAride89 · 09-04-2009, 08:09 AM

I did not replace the timing chain....

mototripleAride89 · 09-04-2009, 08:09 AM

The bike is a 2007 and had no time on it b4 I installed the big bore

fatcaaat · 09-04-2009, 08:29 AM

Quote:

Originally Posted by mototripleAride89

I have a crf70 and have just put on the tb kit with race head. I noticed that my timing is not lining up on the head .... I have everything correct and its showing up right b4 marking or after . Its like it right in between and is making it wrong like it has no ass on bottom but is fast on top........ is there a cam sprocket I was suppose to get with this kit ?????? Thanks for your help

When this happens I always set them below the mark instead of above it.

mototripleAride89 · 09-04-2009, 08:31 AM

with way above or below and does ur bike run funny though

fatcaaat · 09-04-2009, 08:39 AM

Quote:

Originally Posted by mototripleAride89

with way above or below and does ur bike run funny though

It CAN"T be way above or way below...it can technically only be a little above or below...each chain link only accounts for about 5 degrees of timing and when you split that above or below the mark we're talking 2.5 degrees.

No, none of my bikes run funny...unless you think 85mph on 10" wheels is funny!

doopsx3 · 09-04-2009, 08:43 AM

Quote:

Originally Posted by fatcaaat

It CAN"T be way above or way below...it can technically only be a little above or below...each chain link only accounts for about 5 degrees of timing and when you split that above or below the mark we're talking 2.5 degrees.

No, none of my bikes run funny...unless you think 85mph on 10" wheels is funny!

haha thats funny!!!...seriously tho...I know there are 2 types of camshaft sprockets between the China and Honda cams...does it make any difference using the higher tooth count sprocket vice the lower count sprocket (camshaft sprocket that is)

dirtbkr188 · 09-04-2009, 01:18 PM

The cam sprocket HAS to be twice the number of teeth that are on the crank-mounted drive sprocket, otherwise you'll throw your timing right down the crapper in 1RPM.

Honda is usually 28-14 and the China ones are 32-16

mototripleAride89 · 09-04-2009, 03:47 PM

This is all honda..... What is the stock jetting on the 20mm carbs I have bought it used and is clean so no issue there!!!!!

nlipshutz · 09-04-2009, 05:54 PM

I think the pilot is a 35. And i know the main is an 89

firepower354 · 09-04-2009, 08:40 PM

360/28=12.85-ish

Below is advancing the cam, above is retarding it from "correct". 70's seem to wear chains. A replacement is $15 and usually gets you back on-center. Odd deck heights, cut heads, etc will alter it, too.

firepower354 · 09-04-2009, 08:41 PM

Quote:

Originally Posted by dirtbkr188

The cam sprocket HAS to be twice the number of teeth that are on the crank-mounted drive sprocket, otherwise you'll throw your timing right down the crapper in 1RPM.

Honda is usually 28-14 and the China ones are 32-16

Is it "more teeth for torque, less for speed"???

dirtbkr188 · 09-04-2009, 08:45 PM

Yep, you run the Honda setup for more top end, and the Chinese setup for more low-end grunt...

mototripleAride89 · 09-05-2009, 10:09 PM

Thanks guys for ur time and helping me out here..... I will post it up when she is runnihg I broke the tans for the stator as the chain broke through it. Got parts ordered LOL

09-03-2009, 09:37 PM	#1 (permalink)
mototripleAride89 PM Newbie Join Date: Mar 2008 Location: Cincinnati OHio Posts: 89 My Mood:	crf70 tb88 with race head issue I have a crf70 and have just put on the tb kit with race head. I noticed that my timing is not lining up on the head .... I have everything correct and its showing up right b4 marking or after . Its like it right in between and is making it wrong like it has no ass on bottom but is fast on top........ is there a cam sprocket I was suppose to get with this kit ?????? Thanks for your help

09-03-2009, 09:43 PM	#2 (permalink)
firepower354 Advertiser Join Date: Oct 2006 Location: Flint MI Posts: 10,998 My Mood:	Re: crf70 tb88 with race head issue Did you replace the timing chain? __________________ If it has my name on it I did it;) FirepowerMinis.com Custom FPM parts and engines. Parts and service for all makes. Honda Trail Bikes parts and accessories. Pitster/Piranha/Thumpstar bikes, parts, engines and accessories.

09-04-2009, 08:09 AM	#3 (permalink)
mototripleAride89 PM Newbie Join Date: Mar 2008 Location: Cincinnati OHio Posts: 89 My Mood:	Re: crf70 tb88 with race head issue I did not replace the timing chain....

09-04-2009, 08:09 AM	#4 (permalink)
mototripleAride89 PM Newbie Join Date: Mar 2008 Location: Cincinnati OHio Posts: 89 My Mood:	Re: crf70 tb88 with race head issue The bike is a 2007 and had no time on it b4 I installed the big bore

09-04-2009, 08:31 AM	#6 (permalink)
mototripleAride89 PM Newbie Join Date: Mar 2008 Location: Cincinnati OHio Posts: 89 My Mood:	Re: crf70 tb88 with race head issue with way above or below and does ur bike run funny though

09-04-2009, 01:18 PM	#9 (permalink)
dirtbkr188 3rd Gear Member Join Date: May 2004 Location: New Jersey Posts: 2,972	Re: crf70 tb88 with race head issue The cam sprocket HAS to be twice the number of teeth that are on the crank-mounted drive sprocket, otherwise you'll throw your timing right down the crapper in 1RPM. Honda is usually 28-14 and the China ones are 32-16

09-04-2009, 03:47 PM	#10 (permalink)
mototripleAride89 PM Newbie Join Date: Mar 2008 Location: Cincinnati OHio Posts: 89 My Mood:	Re: crf70 tb88 with race head issue This is all honda..... What is the stock jetting on the 20mm carbs I have bought it used and is clean so no issue there!!!!!

09-04-2009, 05:54 PM	#11 (permalink)
nlipshutz 2nd Gear Member Join Date: Aug 2008 Location: Fort Worth, TX Posts: 309 My Mood:	Re: crf70 tb88 with race head issue I think the pilot is a 35. And i know the main is an 89

09-04-2009, 08:40 PM	#12 (permalink)
firepower354 Advertiser Join Date: Oct 2006 Location: Flint MI Posts: 10,998 My Mood:	Re: crf70 tb88 with race head issue 360/28=12.85-ish Below is advancing the cam, above is retarding it from "correct". 70's seem to wear chains. A replacement is $15 and usually gets you back on-center. Odd deck heights, cut heads, etc will alter it, too. __________________ If it has my name on it I did it;) FirepowerMinis.com Custom FPM parts and engines. Parts and service for all makes. Honda Trail Bikes parts and accessories. Pitster/Piranha/Thumpstar bikes, parts, engines and accessories.

09-04-2009, 08:45 PM	#14 (permalink)
dirtbkr188 3rd Gear Member Join Date: May 2004 Location: New Jersey Posts: 2,972	Re: crf70 tb88 with race head issue Yep, you run the Honda setup for more top end, and the Chinese setup for more low-end grunt...

09-05-2009, 10:09 PM	#15 (permalink)
mototripleAride89 PM Newbie Join Date: Mar 2008 Location: Cincinnati OHio Posts: 89 My Mood:	Re: crf70 tb88 with race head issue Thanks guys for ur time and helping me out here..... I will post it up when she is runnihg I broke the tans for the stator as the chain broke through it. Got parts ordered LOL

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