HF Engine Throttle help

Dawud · #1 10-16-2009, 05:24 PM

Hi. I am looking into a 2.5 or 6.5 engine from Harbor Freight. I pulled up the owners manual to try and get some specs and I realized it has a friction throttle hold. My question go to all who have used these engines. How do you modify it to accept a throttle cable and return spring? Thank you!!

Dawud · #2 11-15-2009, 08:48 PM

Seriously? Does anyone know how this is done? It has been one day shy of a month.

KilroyCD · #3 11-15-2009, 09:23 PM

Sorry, I missed your first post. Fossil (my brother) did the engine work on our 2.5hp HF engine, and he was able to modify it pretty easily. I'll PM him so he can answer your question.

Fossil · #4 11-15-2009, 09:35 PM

Hello
I disconnected the governor linkage and fabricated a bracket that bolted to the valve cover bolts. I ran the throttle cable through the bracket and connected it to the throttle lever of the carb. I used a brake cable clamp that I attached to the throttle lever to anchor the cable. I will try to remember to take pictures tomorrow. I will update this post then.
Jim

Here are a few pictures. The first picture is the throttle and the second picture shows what I did with the governor. I used the spring to keep tension on governor parts in the engine. As the engine revs up the arm pulls on the spring like it would if the linkage was still connected to the throttle. In case your curious the air cleaned is from a 2000 WC-1 Whizzer. It took a little work to make it fit but it was worth it. I like the look.

TheOtherStyle · #5 11-15-2009, 11:58 PM

Cant wait to see!

Dawud · #6 11-19-2009, 04:32 PM

Thank you for your responses. I ended up settling on the 2.5 hp engine due to the weight. I still have a heavy diesel project on the back burner. Thank you again. My engine should be here either tomorrow or Monday.

SPENCER15 · #7 11-21-2009, 08:52 AM

i was looking at that 6.5 horse greyhound on Harbor Hreight but thats a lot of power for a bike. For my project i think im going to use a for horse power engine. If you think about it the 66/80cc will do 30 and its 2.5 horse. At the same gear ratio the 6.5 should do just about 50 (

i think)

professor · #8 11-23-2009, 12:59 PM

I have a HF 2.5 an it is 20 pounds- a lot if it is on the back. Not bad if it is in the frame.
Think about the damage you can do to yourself or someone else if something goes wrong at high speed before you shoot for it.

**Dan** · #9 12-02-2009, 12:26 AM

Quote:

Originally Posted by Fossil

Hello
I disconnected the governor linkage and fabricated a bracket that bolted to the valve cover bolts. I ran the throttle cable through the bracket and connected it to the throttle lever of the carb. I used a brake cable clamp that I attached to the throttle lever to anchor the cable. I will try to remember to take pictures tomorrow. I will update this post then.
Jim

Here are a few pictures. The first picture is the throttle and the second picture shows what I did with the governor. I used the spring to keep tension on governor parts in the engine. As the engine revs up the arm pulls on the spring like it would if the linkage was still connected to the throttle. In case your curious the air cleaned is from a 2000 WC-1 Whizzer. It took a little work to make it fit but it was worth it. I like the look.

Fossil, do you know what the idle speed is on the 2.5?

Fossil · #10 12-02-2009, 07:12 PM

Hi Dan
I don't know for sure because I have not put a tach on it yet but i believe it is close to 1000rpm's.
Jim