Subject: RE: motor identification and cure
Author: Charlie Mullendore
Date: Sep 10, 2005, 4:23 PM
Post ID: 1719412844
Hi Joel,
joel urruty wrote:
I was hoping that someone out there might be able to identify what model bike my motor came from. The bike is a 1974 disc eldorado, but the motor was swapped out years ago. The # stamped on the motor is VG-133863. I was told by Paul L. when I registeredthe bike on the looplist that the motor probably came off a tonti frame bike. I'd like to find out what exact model bike so that I may deal with it properly. i have propbably been tuning this bike (valve gaps) incorrectly all this time. |
is likely from a slightly later Convert or G5. The V7 Sport, 850T, T3,
G5, Convert, SP and LeMans with round-head engines all use the same
valve clearance spec. (.009"in./.009"ex.) according to Guzziology.
| PS. One ailment i would like to shoot out there is The bike has just started doing something weird. It idles fine. When I rev it in neutral it revs fine. When I am in gear and suddenly give it alot of throttle it bogs down. I am cleaning the K&N air filters, replaced the fuel filters, adjust the carbs, checked the timing. |
Could be the check ball in the accelerator pump plungers is stuck or the
plungers themselves are installed incorrectly. Might not be a bad idea
to buy a pair of kits from MG Cycle and clean the carbs if they haven't
been recently (or just drop the float bowls, remove the main jet and
it's holder - the plunger should come out then).
I have also noticed some oil on
| the right jug under the spark plug. It does not look like the head gasket is leaking but there is oil on the fins above it. When I pulled out the spark plug it had oil crud all over it. Any suggestions? |
The aluminum plug covering the top (12 o'clock position as you face the
head) head nut uses an o-ring as a seal. These will get hard and leak
after a while, dripping down the "valley" cast into the head and onto
the plug and/or wire - simply replace the o-ring. Better course of
action is to retrofit the steel plugs and aluminum crush washers from an
Ambo or Eldo. Hope this helps.
Charlie
http://www.loopframeguzzi.com/