Speed - RC Nitro Boats For all your rc nitro fuel burning boating needs.

K&B 35

Old 01-16-2004, 03:57 PM
Junior Member
Thread Starter
Join Date: Jan 2004
Location: Crestline, CA
Posts: 1
Likes: 0
Received 0 Likes on 0 Posts
Default K&B 35

I have a K&B 35 outboard and I would like to get any info on this particular engine. I have not had any luck trying to get this thing to run properly and have been told that this engine will not idle, but to put it in the water when its runing. Any info would be much appreciated. Thanks, Don
Old 01-17-2004, 10:14 AM
Ron Olson
My Feedback: (1)
Ron Olson's Avatar
Join Date: May 2002
Location: Kalamazoo, MI
Posts: 18,688
Likes: 0
Received 20 Likes on 17 Posts
Default RE: K&B 35

So what's the problem? Set the high speed needle at arund 3-1/2 turns out then raise the revs up a little before you launch it. The motor isn't made to idle in the water, you have to keep a certain amount of speed up when running it.
Old 01-17-2004, 11:26 PM
Will Sgarlat
Join Date: Nov 2002
Location: Centerville, MA
Posts: 217
Received 0 Likes on 0 Posts
Default RE: K&B 35

Hi Don,
I'm not sure if it's due to my particular setup, but my K&B 3.4 outboard has to be blubbery rich when out of the water. The engine is a stock 3.5 with 13 mm crank and black carb, mounted on a wooden Dumas Sprint, with an Octura x440 3-blade prop.
After a nice underhand toss into the water it promptly moves out and screams. If I lean the mixture out, I can hear the revs begin to drop after 20 to 30 feet into the straight.
I like to keep it a bit rich so it stays well lubricated and so I can prolong the engine's useful life.
Keep tweaking it, starting from too rich to reach peak rpm in the straight to when the r's begin to drop, then richen it.
Good luck
Old 01-27-2004, 01:34 AM
bill heacock
Join Date: Jan 2004
Location: Longmont , CO
Posts: 88
Likes: 0
Received 0 Likes on 0 Posts
Default RE: K&B 35

Try an X440 2 blade, also try dropping one prop size. If the sprint is a tunnel use 1400 series props, they are lifting props, x props are generally for monos.

Bill Hreacock
Old 01-27-2004, 09:30 PM
Will Sgarlat
Join Date: Nov 2002
Location: Centerville, MA
Posts: 217
Received 0 Likes on 0 Posts
Default RE: K&B 35

Thanks Bill!
I thought my setup was just great and I'm very happy with it. But since I don't compete, I don't have other class boats to compare mine to. I'll try a 1400 series lifting prop, maybe it will go even faster!
Old 01-31-2004, 08:41 PM
Join Date: Aug 2003
Posts: 86
Likes: 0
Received 0 Likes on 0 Posts
Default RE: K&B 35

donpstew, check the needvalve to be sure it's not bent. I had a K&B outboard some years ago
that I bought new, and it ran like doo-doo. After several weeks of cussin-n-fussin, a friend of mine came in from out of town, who has a considerable amount of outboard experience, and checked things out. After about 2 minutes of fool'in with it, he unscrewed the needle valve, and the tip was BENT! The needle valve had never been out of the motor until then. So obviously it was goofed-up from the factory. The motor ran great with a new needle valve.
Best wishes,
Old 02-10-2004, 06:36 PM
My Feedback: (22)
Join Date: Oct 2003
Location: manchester, Newmarket NH
Posts: 249
Likes: 0
Received 0 Likes on 0 Posts
Default RE: K&B 35

I had a 3.5 on my prather lap cat-1. I was very impressed with it!!!!!!!
The motor stared great and ran great. It is very high porformance so it may
idle a little tough. i had to get the rpms up a little and wing it to the water duck
coming in for a landing. And it most deffinatly liked to be kept at 1/4 throttle.
Good luck

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Thread Tools
Search this Thread

Contact Us - Manage Preferences - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.