Cooling Fan during carb sync

[JTGS850GL]

I'm getting ready to sync the carbs when they arrive from chef1366's and was wondering what type of cooling fan everyone uses and where do you place it. I have a 20" box fan and a 18" circular fan I plan on using to keep her cool while I take forever to get her idle screws adjusted and synchronized. The box fan will fit between the front wheel and headers, but it seems like it will blow more air under the bike then across the motor.

[koolaid_kid]

Yeah, I would hesitate to place a plastic fan that close to the exhaust header. I place mine in front of the front wheel, turn it to high, and go to town.

[chuck hahn]

I have an old furnace blower wired up to the highest speed wires. I set it inside the top of a 5 gallon bucket for the base. Slide it up along side the forks and as close to facing the center of the engine. LOTS of airflow to the point that while you behind the engine working a nice warm breeze is blowing on you from the engines heat.

Have any buddies that do HVAC work save you one. Probably could make a stand to mount it to if you really wanted to do so.

Youll get way more air from the blower than any house fan will ever deliver.

[rapidray]

This is what I use while syncing carbs & between rounds at the dragstrip to cool the dragbike. It is called the Blue Blower. They work VERY well! Ray.

[chuck hahn]

I got the idea for the furnace blower from the fan on a Dyno. Not the same air as the dyno fan but a heck of a lot more than a house fan will deliver. LOTS of air is a very good thing here..in my opinion.

The usual thrown away furnace blowers are at a good price too...usually free for the taking.

[tkent02]

I dunno, I just do them quickly, and shut it off if I get hung up on anything. Usually in and out in maybe three minutes or so, they don't get that hot.

[chuck hahn]

So you start on a cold engine and don't warm it up which would be the optimal way to sync..to an engine at operating temperature I mean.

[tkent02]

So you start on a cold engine and don't warm it up which would be the optimal way to sync..to an engine at operating temperature I mean.

No, I generally go for a ride, long enough to get the oil and everything hot, and come home and shut off the bike. Hook up all of the vacuum hoses and such, run it a few seconds and see what the synch looks like. If one or more cylinders are a little off, I shut it off and remove the gas tank, hook up my little portable fuel bottle and and figure out how to loosen the locknut or find whatever tools I need to adjust it. Get everything all set up, fire it up and turn some screws. Usually the engine only runs a couple minutes. Any delays for any reason, I shut it off while I deal with it.

If I get a little slow for some reason, just shut it off for 10 or 15 minutes to let it cool.

Never had a problem quickly getting the synch really close, except on bikes with other problems where the synch just won't come in, if that's the case I just leave it and go fix whatever the problem is.

[chuck hahn]

Well if you've ridden it and its already warmed up thats another story. I took it as you hook it all up and then start on a cold engine. I start on a cold engine so as not to burn my hands ( remember that picture of the infection from accidentally hitting a hot fin ) and then start and warm up the bike for 5 minutes or so.

Learned that lesson by the burn and infection I suffered. It was only a second or so but it was long enough. Still got a nice scar from that little episode!!

[chuck hahn]

Here is the fan with the little frame stand I made for it this afternoon. Fits perfectly at a level between the head and the bottom end for good air around and thru the engine. No more dragging the bucket around to sit it on.