switching to alky need help

[mike454]

im wanting to switch my 4 mill over to alky wut all do i need to change an do to the motor to make it run i found a set of 34mm alky carbs and some 18cc coolhead domes is there anyhing else i need?

[J-Madd]

RUn "9" series plugs (b9es, b9egv, etc) gapped at 0.018". Learn how to read alky plugs. Purge it with gas when done riding for the day. YOu can usually run a little more timing with alky. Maybe start with +8 degrees. Start with the powerjets all the way out and screw them in about 1/ 4 turn at at time until the motor runs clean throught the gears. It's usually still rich at that point, but very safe to run. You can get a little more hp out of it by going leaner, but it's usually not worth going past that safe point. You can run alky rich and still make good power. Oh...mix your methanol compatible oil oil (Benol, Super Techniplate, Redline) at 20:1.

[kawiking]

20;1 .. damn . i run mine around 32:1

[J-Madd]

20;1 .. damn . i run mine around 32:1

 

 

Sometime long, long ago, in a land far, far away, someone claimed that the richer oil mixture makes more hp on the dyno . I don't know for sure; and it hasn't helped protect my bearings any better - so I dunno .

 

Also Mike - you'll need to run a dual feed pingel fuel petcock and be sure to remove the check valve in the gas cap and drill the vent out bigger.

[mike454]

RUn "9" series plugs (b9es, b9egv, etc) gapped at 0.018". Learn how to read alky plugs. Purge it with gas when done riding for the day. YOu can usually run a little more timing with alky. Maybe start with +8 degrees. Start with the powerjets all the way out and screw them in about 1/ 4 turn at at time until the motor runs clean throught the gears. It's usually still rich at that point, but very safe to run. You can get a little more hp out of it by going leaner, but it's usually not worth going past that safe point. You can run alky rich and still make good power. Oh...mix your methanol compatible oil oil (Benol, Super Techniplate, Redline) at 20:1.

 

 

ok ive already got br9es plugs in it an runnin 11 degrees in timing im runnin benol 20:1 an thanks for the help

[banshee(911)]

RUn "9" series plugs (b9es, b9egv, etc) gapped at 0.018". Learn how to read alky plugs. Purge it with gas when done riding for the day. YOu can usually run a little more timing with alky. Maybe start with +8 degrees. Start with the powerjets all the way out and screw them in about 1/ 4 turn at at time until the motor runs clean throught the gears. It's usually still rich at that point, but very safe to run. You can get a little more hp out of it by going leaner, but it's usually not worth going past that safe point. You can run alky rich and still make good power. Oh...mix your methanol compatible oil oil (Benol, Super Techniplate, Redline) at 20:1.

hmm im running 8 series plugs what diff is the 9's?

[J-Madd]

hmm im running 8 series plugs what diff is the 9's?

 

The 9 series is a "colder" plug. It moves heat from the tip of the plug better than the 8 series. It doesn't necessarily make the motor run cooler. The alky won't foul a plug as easy is one reason you can run the colder plug. The hotter plug is required on gas to keep the plug cleaned (burned) off to prevent fouling. That being said - some people do run 8 series with alky, and I happen to run a br10eix on my 10 mil Cub.

[mike454]

The 9 series is a "colder" plug. It moves heat from the tip of the plug better than the 8 series. It doesn't necessarily make the motor run cooler. The alky won't foul a plug as easy is one reason you can run the colder plug. The hotter plug is required on gas to keep the plug cleaned (burned) off to prevent fouling. That being said - some people do run 8 series with alky, and I happen to run a br10eix on my 10 mil Cub.

 

 

should i go to the 8 if im still running 110 octane

[J-Madd]

Yes run an 8 with gas.

[mike454]

Yes run an 8 with gas.

 

 

i found a set of keihin pjs 34mm bored to 35mm are these good carbs