rotary valve timing

hogwild · 11-05-2009, 09:28 PM

now i done it! took apart rotary valve without marking were it was now i dont know were to set it. is thier any way to figure this out with out a trip to dealer ?.. had to tighten fitting under the rotary valve it was leaking thats why i took it apart..

Summitric · 11-06-2009, 12:37 AM

Originally Posted by hogwild

now i done it! Took apart rotary valve without marking were it was now i dont know were to set it. Is thier any way to figure this out with out a trip to dealer ?.. Had to tighten fitting under the rotary valve it was leaking thats why i took it apart..

i have a shop manual if you want..... You're the guy that knows gerald melloy..... He is now a member on this site too.... He is under the name of his car(can't remember the name...dam....gettin' old i guess). It's on one of my t-shirts......let me know if you want to borrow the manual..... This is a 670 i take it???

Deano670 · 11-06-2009, 06:59 AM

Assuming its a 670 the timing on valve works well at

opening 145 degrees and closing 71 degrees with mag cyl at TDC and the measurments being made on the mag side intake port. Now you will need a degree wheel for this. However to be more specific what year and model is the machine? There are 2 pages of timing specs all the way from 1975 up to 1998 for every rotary valve engine ever made.

hogwild · 11-06-2009, 07:37 AM

ya i know gerald, his car name is after shock.looks like my sled is going to dealer i dont have a degree wheel.thought there might be a simpler way. its not a 670 its a 785 union bay based on 670, wonder if timing should be different for this engine.

Summitric · 11-06-2009, 08:07 AM

Originally Posted by hogwild

ya i know gerald, his car name is after shock.looks like my sled is going to dealer i dont have a degree wheel.thought there might be a simpler way. Its not a 670 its a 785 union bay based on 670, wonder if timing should be different for this engine.

hi...... Yup, you should contact union bay, as they liked to have a specific timing......i think they recomended the 583 timing spec, but it would be best to find out their recomendations for sure..........

Gerald's site name is "aftershock"......obviously after his car....

Deano670 · 11-06-2009, 06:00 PM

You will have to contact a company called Fastrax Motorsports as they have purchased union bay and all the rights and specs to there products (253)848-0908. Has there been any modification made to the intake runners of the engine?? I might have a spare degree wheel i can send you.

hogwild · 11-06-2009, 10:17 PM

ya the intake runners have been worked. i am trying to find out who biult motor . waiting for guy i got sled from to get back to me

Deano670 · 11-07-2009, 07:44 AM

Originally Posted by hogwild

ya the intake runners have been worked. i am trying to find out who biult motor . waiting for guy i got sled from to get back to me

If it is without a doubt a union bay engine call Fastrax, they should have all the specs for that engine

11-05-2009, 09:28 PM	#1 (permalink)
hogwild Member Join Date: Mar 2007 Location: bassano, ab Posts: 48 Casino Cash: $117700 Thanks: 0 Thanked 7 Times in 6 Posts	rotary valve timing now i done it! took apart rotary valve without marking were it was now i dont know were to set it. is thier any way to figure this out with out a trip to dealer ?.. had to tighten fitting under the rotary valve it was leaking thats why i took it apart.. __________________ mud in the blood , rocks in the head, 09 rzr-le,2 inch lift,1" spring spacers,2"spacers rear,1 1/2 " spacers front,snorkels, 28" swamplights,modified stock cage,billet front diff cage,

11-06-2009, 12:37 AM	#2 (permalink)
Summitric Senor Moderator Join Date: Oct 2006 Location: Edmonton/Sherwood Park Posts: 16,465 Casino Cash: $1551380 Thanks: 8,284 Thanked 6,997 Times in 4,022 Posts	Re: rotary valve timing Originally Posted by hogwild now i done it! Took apart rotary valve without marking were it was now i dont know were to set it. Is thier any way to figure this out with out a trip to dealer ?.. Had to tighten fitting under the rotary valve it was leaking thats why i took it apart.. i have a shop manual if you want..... You're the guy that knows gerald melloy..... He is now a member on this site too.... He is under the name of his car(can't remember the name...dam....gettin' old i guess). It's on one of my t-shirts......let me know if you want to borrow the manual..... This is a 670 i take it??? __________________ SUMMITRIC www.sledbunnyracing.com 2006 Summit 1000RT Highmark 162"(THUMPER) 2004 Summit 800X 151"(BLACKWRABBIT) 1998 Yamaha 600 Grizzly Member of Team Slim ALBERT BECK - HIGHMARKING IN THE HEAVENS - REST IN PEACE AUTHORIZED OFFICIAL GEARHEAD!

11-06-2009, 06:59 AM	#3 (permalink)
Deano670 Member Join Date: Oct 2007 Location: Beaumont Posts: 1,205 Casino Cash: $957172 Thanks: 816 Thanked 420 Times in 296 Posts	Re: rotary valve timing Assuming its a 670 the timing on valve works well at opening 145 degrees and closing 71 degrees with mag cyl at TDC and the measurments being made on the mag side intake port. Now you will need a degree wheel for this. However to be more specific what year and model is the machine? There are 2 pages of timing specs all the way from 1975 up to 1998 for every rotary valve engine ever made. __________________ PROUD SUPPORTER OF HONEST PEOPLE!

11-06-2009, 07:37 AM	#4 (permalink)
hogwild Member Join Date: Mar 2007 Location: bassano, ab Posts: 48 Casino Cash: $117700 Thanks: 0 Thanked 7 Times in 6 Posts	Re: rotary valve timing ya i know gerald, his car name is after shock.looks like my sled is going to dealer i dont have a degree wheel.thought there might be a simpler way. its not a 670 its a 785 union bay based on 670, wonder if timing should be different for this engine. __________________ mud in the blood , rocks in the head, 09 rzr-le,2 inch lift,1" spring spacers,2"spacers rear,1 1/2 " spacers front,snorkels, 28" swamplights,modified stock cage,billet front diff cage,

11-06-2009, 08:07 AM	#5 (permalink)
Summitric Senor Moderator Join Date: Oct 2006 Location: Edmonton/Sherwood Park Posts: 16,465 Casino Cash: $1551380 Thanks: 8,284 Thanked 6,997 Times in 4,022 Posts	Re: rotary valve timing Originally Posted by hogwild ya i know gerald, his car name is after shock.looks like my sled is going to dealer i dont have a degree wheel.thought there might be a simpler way. Its not a 670 its a 785 union bay based on 670, wonder if timing should be different for this engine. hi...... Yup, you should contact union bay, as they liked to have a specific timing......i think they recomended the 583 timing spec, but it would be best to find out their recomendations for sure.......... Gerald's site name is "aftershock"......obviously after his car.... __________________ SUMMITRIC www.sledbunnyracing.com 2006 Summit 1000RT Highmark 162"(THUMPER) 2004 Summit 800X 151"(BLACKWRABBIT) 1998 Yamaha 600 Grizzly Member of Team Slim ALBERT BECK - HIGHMARKING IN THE HEAVENS - REST IN PEACE AUTHORIZED OFFICIAL GEARHEAD!

Sponsored Links, Plese click on Banner to View there Website

11-06-2009, 06:00 PM	#6 (permalink)
Deano670 Member Join Date: Oct 2007 Location: Beaumont Posts: 1,205 Casino Cash: $957172 Thanks: 816 Thanked 420 Times in 296 Posts	Re: rotary valve timing You will have to contact a company called Fastrax Motorsports as they have purchased union bay and all the rights and specs to there products (253)848-0908. Has there been any modification made to the intake runners of the engine?? I might have a spare degree wheel i can send you. __________________ PROUD SUPPORTER OF HONEST PEOPLE!

11-06-2009, 10:17 PM	#7 (permalink)
hogwild Member Join Date: Mar 2007 Location: bassano, ab Posts: 48 Casino Cash: $117700 Thanks: 0 Thanked 7 Times in 6 Posts	Re: rotary valve timing ya the intake runners have been worked. i am trying to find out who biult motor . waiting for guy i got sled from to get back to me __________________ mud in the blood , rocks in the head, 09 rzr-le,2 inch lift,1" spring spacers,2"spacers rear,1 1/2 " spacers front,snorkels, 28" swamplights,modified stock cage,billet front diff cage,

11-07-2009, 07:44 AM	#8 (permalink)
Deano670 Member Join Date: Oct 2007 Location: Beaumont Posts: 1,205 Casino Cash: $957172 Thanks: 816 Thanked 420 Times in 296 Posts	Re: rotary valve timing Originally Posted by hogwild ya the intake runners have been worked. i am trying to find out who biult motor . waiting for guy i got sled from to get back to me If it is without a doubt a union bay engine call Fastrax, they should have all the specs for that engine __________________ PROUD SUPPORTER OF HONEST PEOPLE!

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